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Cable Products
Installation Equipment

Explosion-proof junction boxes GERDA-KSA, GERDA-KSN

An open metallic electrical junction box with multiple cable glands and a terminal block inside
An open metallic electrical junction box with multiple cable glands and a terminal block inside

Explosion-proof junction boxes GERDA-KSA, GERDA-KSN

Explosion-proof junction boxes GERDA-KSA, GERDA-KSN
  • Affordable prices, no markups or overpayments;
  • Stability of production and rhythm of deliveries;
  • We comply with GOSTs and all technological standards.

To find out the cost of the cable, send the order code to our managers.

Generate order code
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Delivery is carried out as soon as possible after the order is placed.

Purpose and application of GERDA-KSA and GERDA-KSN boxes

  • Purpose

    Explosion-proof junction boxes are designed for connecting and branching armored and non-armored cables with copper or aluminum conductors in AC or DC circuits.

    Application

    Hazardous areas in indoor and outdoor installations in accordance with Ex-marking and GOST IEC 60079-14, which regulate the use of electrical equipment in explosive gas and dust environments. Climatic version B, placement category 1–5 according to GOST 15150.

    Compliance with Standards

    The boxes comply with the requirements of the following standards: GOST 31610.0, GOST IEC 60079-1, GOST 31610.7, GOST 31610.11, GOST IEC 60079-31, GOST IEC 60079-14, as confirmed by the certificate of conformity with the technical regulations of the Eurasian Economic Union TR CU 012/2011 “On the safety of equipment for use in explosive environments.” Certificate registration number: EAEU RU С-RU.АА87.В.01227/23. By decisions of the EEC Board dated 22.11.2022 No. 182 and 01.12.2020 No. 158, amendments were made to the lists of standards required for application and compliance with TR CU 012/2011 “On the safety of equipment for use in explosive environments.” As a result, from 30.06.2023, a significant number of standards were excluded from TR CU 012/2011, and new standards were introduced. The new standards have revised requirements for Ex-marking. Aluminum GERDA-KSA and stainless steel GERDA-KSN junction boxes have successfully passed certification for compliance with TR CU 012/2011 under the new standard requirements and received updated Ex-marking.

    The boxes are certified under the voluntary certification system INTERGAZSERT. Certificate registration number: OGN4.RU.1103.B02847.

    Certification details are available in the Rosaccreditation register

Main parameters and characteristics

Ex-marking1Ex eb IIC T6…T4 Gb X 1Ex ia IIC T6…T4 Gb X 1Ex eb db IIC T6…T4 Gb X 1Ex eb [ia] IIC T6…T4 Gb X Ex tb IIIC T85°C…T135°C Db X
Degree of protection against external influences (IP code) according to GOST 14254IP66
Ambient temperature range, °C:

  • standard version box
  • frost-resistant version box (HL)
Minimum temperature, °CMaximum temperature, °C depending on the temperature class
T6 (T85°C)T5 (T100°C)T4 (T135°C)
-40 -60+40+55+95
Maximum voltage 1, V1500
Maximum current 1, A500
Maximum cable core cross-section 1, mm²240
Type of core fastening in terminal clamp 1screw (default) or spring (P)
Box body coating:

  • GERDA-KSA (aluminum)
  • GERDA-KSN (stainless steel)
  • powder coating, gray RAL 7001 (or other as per customer request)
  • polished surface, grit P240

Design description

  • The body and cover of the GERDA-KSA box are made of aluminum, while the body and cover of the GERDA-KSN box are made of stainless steel. A silicone gasket between the body and the cover ensures the required degree of protection against external influences. The body and cover are secured with captive stainless steel screws. Ex cable glands are located on the end walls of the body. Inside the body, connection terminals (clamps, terminal blocks) are installed on a mounting rail, certified for compliance with the requirements of TR CU 012/2011 “On the safety of equipment for use in explosive environments.”

    The boxes may also include Ex components certified for compliance with TR CU 012/2011 requirements: switches, selectors, push buttons, signal lamps, distribution buses, measuring instruments, and other electrical equipment in accordance with the manufacturer’s technical documentation.

    The body size, type and number of terminal clamps, as well as the type and number of cable glands, are determined by the designation of the junction box. The designation scheme for ordering a junction box is provided below.

    To simplify ordering, an abbreviated designation (“Standard Junction Box”) may be used. The composition of the “Standard Junction Box” is fully predefined and specified below.

  • An open gray electrical junction box with multiple cable glands and a terminal block inside

    According to the new requirements of the standards included in the TR CU 012/2011 list, an additional label must be applied to the box cover, providing information on the permissible range of conductor cross-sections, the maximum current value for each conductor cross-section, and the maximum number of wires in the box.

Recommendations for selecting a junction box

Step 1: Determining the type of terminal clamps

    • Terminal clamps (terminals) are installed inside the box on a DIN rail. All terminals have Ex marking.
    • The boxes use the highest quality terminals – the most reliable among existing terminals.
    • Terminals are divided into through-type (standard two-contact) and grounding terminals. Through terminals are gray, grounding terminals are yellow-green, and blue through terminals can be installed in boxes with explosion protection type “i” (intrinsically safe electrical circuit).
    • Based on the method of securing the conductive core of the wire, terminals are classified as:

      • Screw terminals, where the conductor is secured using a screw and clamping device.
      • Spring terminals, which provide maximum installation speed and securely hold the wire using a spring mechanism. Unlike screw terminals, they do not require torque control for tightening and offer maximum resistance to vibration.
    • The terminal size is selected based on the maximum allowable cross-section of the stranded conductor, mm²: 1.5; 2.5; 4; 6; 10; 16; 35; 50; 70; 95; 120; 150; 185; 240.

  • Note:

    • For cables used in industrial automation (analog and discrete signal circuits, twisted pair cables, etc.), we recommend using terminals for conductors with a cross-section of up to 4 mm², as they are the most convenient for wire connections.
    • Different types and sizes of terminals can be installed in the junction box simultaneously.
    • By special order, jumpers between terminals can be installed. To request this option, a wiring diagram must be attached to the junction box request.
    A gray feed-through terminal block with screw connections

Step 2: Selection of Cable Glands and Plugs

    • The cable gland is selected based on:

      • the cable diameter;
      • the presence of armor in the cable (armored or non-armored cable).
    • By default, cable glands are made of nickel-plated brass but can also be made of stainless steel (SS).
    • A threaded plug is used to seal an unused cable gland opening. A junction box with an installed threaded plug can be operated while maintaining explosion protection requirements and preserving the IP rating (protection against dust and water ingress).
    • If you do not have a specific preference, we recommend using the new line of GERDA cable glands.

GERDA Cable Glands for NON-ARMORED Cables

GERDA-KVGERDA-KVMGERDA-KVRVGERDA-KVRNGERDA-KVTr
GERDA-KV
GERDA-KVM
GERDA-KVRV
GERDA-KVRN
GERDA-KVTr
For all types of non-armored cablesFor round-section non-armored cables installed in a sealed metal conduit GERDA-MG. The conduit is directly connected to the glandWith an internal thread at the end, for all types of round-section non-armored cables installed in a pipe or metal conduit. The pipe requires threading, and the conduit needs a connectorWith an external thread at the end, for all types of round-section non-armored cables installed in a pipe or metal conduit. The pipe requires threading, and the conduit needs a connectorWith a collet clamping device for securing the pipe, for all types of round-section non-armored cables installed in a pipe. No threading is required on the pipe

GERDA cable glands for ARMORED cables

armor type: steel tape, single-layer steel wire, steel braided mesh

GERDA-KVBGERDA-KVBMGERDA-KVBRVGERDA-KVBRNGERDA-KVBT
GERDA-KVB
GERDA-KVBM
GERDA-KVBRV
GERDA-KVBRN
GERDA-KVBT
for all types of armored round-section cablesfor all types of armored round-section cables laid in the GERDA-MG sealed metal conduit. The metal conduit is directly connected to the glandwith an internal thread at the end, for all types of armored round-section cables laid in a pipe or metal conduit. The pipe must be threaded, and a connector is required for the metal conduitwith an external thread at the end, for all types of armored round-section cables laid in a pipe or metal conduit. The pipe must be threaded, and a connector is required for the metal conduitwith a collet pipe fastening device, for all types of armored round-section cables laid in a pipe. No threading is required on the pipe

  • Advantages of the GERDA Cable Gland

    A cross-sectional diagram of a threaded mechanical component with labeled parts
    1. A cable hole plug is installed, made of flame-retardant, impact-resistant, and chemically resistant plastic. This allows the cable gland to be used without a mounted cable. The plug is removed during cable installation
    2. Cable gland material:

      • nickel-plated brass (default option)
      • “NS” – stainless steel
      • Only one sealing ring with an insert covers the entire cable diameter range. The ring is non-removable, preventing accidental loss.
      • Maximum wide cable diameter range – up to 30% larger compared to glands from other manufacturers.
      • The sealing ring protects the cable from pulling out and twisting, while also providing environmental protection (IP66/IP67/IP68).
    4. A rubber oil- and petrol-resistant ring at the gland base prevents dust and moisture from penetrating through the threaded connection into the electrical equipment. The ring is installed in a special groove, ensuring it does not get damaged or crushed when tightening the gland

  • Permissible Cable Diameter

    A bar chart showing tightening torque ranges for cable glands based on cable diameter
  • A 3D illustration of a blue cable gland
    ↑ Sealing ring assembled with an insert. The ring is made of a special elastomer based on synthetic rubber, which has a wide operating temperature range, is chemically resistant, and UV-resistant. The sealing ring is marked with the cable diameter range

Step 3: Selecting the Enclosure

  • A closed light blue GERDA-KSA electrical box with screws and cable glands
    GERDA-KSA aluminum enclosure
    A closed metallic GERDA-KSN electrical box with screws
    GERDA-KSN stainless steel enclosure
    • Enclosure materials vary:

      • Aluminum – GERDA-KSA
      • Stainless steel – GERDA-KSN
    • Enclosure size is determined by the number of selected terminals:

    • Grounding terminals must be included in the total number of terminals. Total terminal count = number of through terminals + number of grounding terminals.
    • The selected enclosure must accommodate the required cable glands. The number of glands on each side must not exceed the specified limits for GERDA-KSA and GERDA-KSN. Threaded hole plugs must be included in the total number of cable glands.
    • If the cable glands do not fit on a particular side of the enclosure, some should be relocated to another side, or a larger enclosure should be chosen.
    • The condensate drain device (CSD) must be positioned on the bottom side of the enclosure; otherwise, it will not function correctly. The CSD should be counted in the total number of cable glands on that side of the enclosure.
    • For maximum reliability in outdoor electrical installations, it is recommended to avoid placing cable glands on the top side of the enclosure whenever possible.

  • Note

    • The allowable number of cable glands per side for GERDA-KSA and GERDA-KSN is specified only for KV or L-type glands, which are for unarmored cables. For all other types of glands, the allowable number is reduced by half.
    • The fewer glands on a side of the enclosure, the easier they are to maintain.
    • If the enclosure is ordered with an explosion-proof cover opening sensor (DV), approximately 30 mm of space on the DIN rail and an additional 3 through terminals are required for its installation. This amount of space is equivalent to 8 terminals for conductors with a cross-section of up to 4 mm².
  • A close-up of a condensate drain device on a gray electrical junction box with terminal blocks and cable glands
    Condensate Drain Device (CSD)

Junction box with a cover opening sensor

  • An open gray electrical box with a terminal block, cable glands, and a lid opening sensor

Step 4: Selecting Accessories

  • “C”, “RZ” — Explosion-Proof Threaded Plug Seal

    A metallic threaded plug with a black sealing ring
    • Used for sealing an unused opening in electrical equipment enclosures
    • Material options:

      • – Nickel-plated brass (default)
      • – Stainless steel (add “NS” at the end of the designation)
  • ORDER DESIGNATIONTHREADALTERNATIVE DESIGNATION
    C1M20 x 1.5RZ 20
    C2M25 x 1.5RZ 25
    C3M32 x 1.5RZ 32
    C4M40 x 1.5RZ 40
    C5M50 x 1.5RZ 50
    C6M63 x 1.5RZ 63

  • “USC” — Explosion-Proof Condensate Drain Device

    • Designed for removing moisture from the box, equalizing pressure and temperature
    • Must be installed on the bottom side of the box; otherwise, it will not function
    • Made of nickel-plated brass or stainless steel
    ORDER DESIGNATIONTHREAD
    USCM20 x 1.5
  • A metallic cable gland nut with internal threading and a sealing ring

  • “KNK” — Wall Mounting Brackets (Set) for GERDA-KSA

    • Simplifies box mounting on the wall
    • Two possible bracket positions on the box body
    • Material – stainless steel
    • The use of brackets is not mandatory. The box can be secured through internal holes in the body. To do this, the cover must be opened.
    ORDER DESIGNATIONDESCRIPTION
    KNKSet of 4 pcs. with screws and washers
  • A metallic mounting bracket installed on a gray and white surface

  • “KNK” — Wall Mounting Brackets (Set) for GERDA-KSN, Stainless Steel

    • Simplifies box installation on the wall
    • Material – stainless steel
    • Using the brackets is not mandatory. The box can be secured through the internal holes in the housing. To do this, the cover must be opened.
    ORDER DESIGNATIONDESCRIPTION
    KNKSet of 4 pcs. with screws, nuts, and washers
  • A set of metallic mounting clips, including a chain and a single clip

  • “MK” — Mounting Kit (Screws, Nuts, Washers) for GERDA-KSN, Stainless Steel

    • Designed for mounting the GERDA-KSN box to an external structure without using KNK wall mounting brackets. The box is secured through the internal holes in the housing.
    • Material – stainless steel
    ORDER DESIGNATIONDESCRIPTION
    MKSet of 4 pcs. with screws, nuts, and washers
  • A collection of bolts, nuts, flat washers, and lock washers

  • “SZ” — Grounding Busbar, “ISZ” — Insulated Grounding Busbar

    A black-and-white line drawing of a grounding busbar with multiple connection points
    • Designed for grounding cable shields or electrically connecting shields together
    • The SZ grounding busbar is mounted directly to the metal enclosure of the box and is electrically connected to the housing
    • The ISZ insulated grounding busbar is mounted to the housing through insulators, with no electrical contact between the busbar and the box housing
    • The grounding busbar is installed parallel to the row of terminal clamps
    • If two busbars are needed, the quantity is specified before the code, e.g., 2SZ
    • The number of contact clamps on the busbar matches the number of cable entries. If more are required, specify the desired number in parentheses, e.g., SZ(15). The number of clamps should not exceed the total number of terminals in the box
    • Busbar material – copper
    ORDER DESIGNATIONDESCRIPTION
    SZGrounding busbar with clamps, electrically connected to the housing
    ISZGrounding busbar with clamps, electrically insulated from the housing

  • “NP” — External Lid Hinges for GERDA-KSA Box (Set of 2)

    ORDER DESIGNATIONDESCRIPTION
    NPBox with installed lid hinges
  • A black-and-white line drawing of external lid hinges for an electrical box

  • “MP” — Mounting Plate

    • The mounting plate is installed inside the box housing and serves as a base for placing electronic components
    • Material – galvanized steel, thickness 1.5 mm
    ORDER DESIGNATIONDESCRIPTION
    MPPlate installed inside the box housing
  • A black-and-white line drawing of a mounting plate for an electrical box

  • “BP” — Sealing Cover Bolt for Aluminum GERDA-KSA Box

    • The bolt allows sealing the box to protect against unauthorized access
    • If multiple bolts are required, their quantity is specified before the code, e.g., 2BP
    • Material – stainless steel
    ORDER DESIGNATIONDESCRIPTION
    BPBolt installed in the box cover
  • A black-and-white line drawing of a lid bolt with sealing wire for an aluminum box

  • “DV” — Box Cover Tamper Sensor

    • The Ex cover tamper sensor is designed to protect the explosion-proof box from unauthorized access
    • Dry changeover contact (see wiring diagram)
    • Sensor specifications: 1 Ex db IIC Gb U; AC: 2 A, 400 V; DC: 0.5 A, 250 V; silver-plated contacts, 0.75 mm² conductors
    • Three terminal clamps of the box will be used for sensor connection
    ORDER DESIGNATIONDESCRIPTION
    DVSensor installed on a DIN rail, connected to three terminal clamps of the box
  • A photo and schematic of a lid opening sensor in an electrical box with terminal block connections

Ordering designation scheme

  • GERDA-KSA12(10,2)2.5P–2KV20(A)…–1KVM25(B)–HL–1Ex eb IIC T6 Gb X
    12345678910789101112
Parameter NameCode in Designation2Explanation
1Enclosure MaterialAAluminum
NStainless Steel
2Box Size15 … 348Size corresponds to the maximum number of terminals for wires up to 4 mm² that can be installed in the box — see pages 21, 23–24 (GERDA-KSA), page 27 (GERDA-KSN)
3Number of Through Terminals0 … 412The total number of terminals (through + grounding) must not exceed the value specified in the table for GERDA-KSA and GERDA-KSN
4Number of Grounding Terminals
5Terminal Size – Defined by Maximum Conductor Cross-section1.5; 2.5; 4; 6; 10; 16; 25; 35; 50; 70; 95; 150; 240If left blank, terminals of size “4” will be installed – for multi-stranded wires up to 4 mm²
6Special Terminal Design–Leave blank for screw terminals
PSpring-loaded terminal clamps
KCeramic terminal clamps (used in fire-resistant boxes “FR”)
7Number of Cable Glands or Threaded Plugs on the Specified Side1 … 270The total number of cable glands and threaded plugs must not exceed the maximum value specified in the table for GERDA-KSAand GERDA-KSN
8Cable Gland or Threaded Plug DesignationKV, KVM, KVRV, KVRN, KVTp, KVB, KVBM, KVBRV, KVBRN, KVBTr, L, KM, B, BD, S, RZSee the “Cable Glands” section for designation details
9Thread Size of Cable Gland or Threaded Plug1, 2, 3, 4, 5, 6 or 20, 25, 32, 40, 50, 63Thread size is determined when selecting a cable gland
10Side Location of Cable Gland or Threaded PlugA, B, C, DThe external grounding clamp is located on side “D”
11Special Versions and Accessories (Multiple Indexes are Listed with a Dash or Comma)HL, FR, SZ, ISZ, KNK, USC, MP, NP, BP, DVHL – Resistance to low temperatures down to -60°C, FR – Fire-resistant GERDA-KSN box with ceramic terminals for fire-resistant wiring according to GOST R 53316 and PAZ (ESD), SZ – Grounding bus, ISZ – Electrically insulated grounding bus, KNK – Wall mounting bracket, USC – Condensate drainage device, MP – Mounting plate, NP – External lid hinges, BP – Sealed lid bolts, DV – Ex-opening detection sensor. See “Accessory Selection” for details.
12Ex Marking1Ex eb IIC T6…T4 Gb X, 1Ex ia IIC T6…T4 Gb X, 1Ex eb db IIC T6…T4 Gb X, 1Ex eb [ia] IIC T6…T4 Gb X, Ex tb IIIC T85…135°C Db XThe temperature class T must be determined in the Ex marking, for example: 1Ex eb IIC T6 Gb X

NOTE:

  • 1 — It is recommended to choose the GERDA-KSA size from the stock program of junction boxes, the list of which is specified in the table GERDA-KSA.

    2 — For standard junction boxes, the composition is fully predefined and specified. A simplified designation is used for these boxes: positions 3…10 are left blank, and after position 12, “(Standard)” is indicated. For example: GERDA–KSA9–1Ex ia IIC T6 Gb X (Standard).

    Examples of junction box designation when ordering:

    GERDA–KSA26(20.0)P–1KV32(A)–2KVM25(B)–ISHZ–1Ex ia IIC T4 Gb X TU 3424-010-45416838-2006 GERDA–KSA12–HL–1Ex eb IIC T6 Gb X (Standard) TU 3424-010-45416838-2006

Characteristics of GERDA-KSA aluminum enclosures — complete list of enclosures

GERDA Junction Box TypeEnclosure Size, W×L×H, mmMaximum Number of Terminals for Conductors with Cross-Section, mm²DIN RailMax. Number of Cable Glands Type “KV” or “L” on One Side (A, B, C, D). For All Other Types of Glands — Max. Quantity is Half of the Indicated Value. If Different Sizes Are Used on One Side, Consider the Percentage Ratio.Max. Dissipated Power, WWeight, g
SizeMax. QuantityM20M25M32M40M50M63
2.54610163550A/VB/GA/VB/GA/VB/GA/VB/GA/VB/GA/VB/G
KSA 580x75x5787·····TS 1512111········10300
KSA 1380x125x571613·····TS 1513221········15375
KSA 2180x175x572621·····TS 1515231········20550
KSA 3280x250x524033·····TS 1518251········25730
KSA 9100x100x811197····TS 351532111······19620
KSA 19100x160x81231914····TS 3511034131······26820
KSA 24100x200x81302519····TS 3511235131······31970
KSA 10120x122x811210765··TS 351442211······24940
KSA 11120x122x911210765··TS 351442211······26960
KSA 25120x220x813126201613··TS 3511245231······381410
KSA 26120x220x913126201613··TS 3511446241······401430
KSA 47120x360x815849372925··TS 35124410271······571970
KSA 12140x140x9116131087··TS 351843221······321520
KSA 22140x200x912622171311··TS 3511245231······422270
KSA 16160x160x912016121086·TS 351965332212···391500
KSA 33160x260x91393325201612·TS 35117610352313···562030
KSA 48160x360x91584937292518·TS 35124615372514···732540
KSA 81160x560x91978161494131·TS 351406243122816···1073760
KSA 20180x180x10124201512108·TS 3511186332222···492270
KSA 35180x280x101423527211813·TS 35118811452423···682920
KSA 28230x100x111332817211813·TS 35161738251312·2451800
KSA 44232x202x11154463414109·TS 35218178865332222682440
KSA 46232x202x181544634141198TS 35233331816109665544923980
KSA 72230x280x111867254441813·TS 352241712895433232862990
KSA 86230x330x1111048866522216·TS 3523017158115534242973390
KSA 88230x330x181104886652221614TS 3526033301618911685841275260
KSA 109230x400x11113011082662821·TS 35239172081456352521133840
KSA 110230x400x2251301108266282118TS 35210044542130131891561251676840
KSA 174230x600x111206174132534433·TS 352541728820410382621596950
KSA 162313x404x111195165123662821·TS 353392620121476453531455300
KSA 163312x403x14119516512366282118TS 35355322818171012774631606720
KSA 164313x404x18119516512366282118TS 353785140242215159116861838480
KSA 165313x404x22719516512366282118TS 353100685433302018121591282088680
KSA 260310x600x1113092611321068833·TS 3536024301220710483631998660
KSA 261310x600x181309261132106883328TS 353108485624321522916612624611100
KSA 348600x600x2024123481981591326656TS 3541081085656323222221616121242825960

Standard junction boxes — composition is predetermined

  • Standard junction boxes are designed as a rectangular housing with a cover, connected by captive stainless steel screws. Inside the housing, terminal clamps for conductors with a cross-section of 0.2 – 4 mm² are mounted on a DIN rail. The terminals are numbered sequentially, starting from “1.” Nickel-plated brass cable glands are located on the side surfaces of the housing.

    Explosion-proof plugs are installed in the cable glands, allowing the box to be used with empty entries (without cables) while maintaining the specified level of explosion protection and the degree of protection against external influences (IP). When inserting a cable, the plug is removed and replaced with a sealing ring of the required diameter — all rings are included in the supply package. The box has both an external and an internal grounding clamp.

    The junction box is easy to choose from among 8 standard sizes of GERDA-KSA aluminum housings and 4 GERDA-KSN stainless steel housings. The boxes are supplied with terminal clamps and cable glands — the quantity and size are specified in the table “Standard Junction Box Specifications”.

  • Steel box for hazardous areas

Standard junction box specifications — with simplified designation for ordering, the box composition is predetermined

Aluminum

GERDA Box TypeKSA5KSA9KSA12KSA16KSA26KSA33KSA48KSA86
Number of InstalledTerminals for conductors up to 4 mm²59121626334886
Cable Glands3471011121737
Box Dimensions L×W×H, mmWith Cable Glands95x120x57140x140x80165x180x90185x200x90220x165x90260x210x90360x210x90385x280x111
Housing (without glands)75x80x57100x100x80140x140x90160x160x90220x120x90260x160x90360x160x90330x230x111
Mounting Dimensions, mmx×y52×6366×8693×120110×14082×204110×240110×340180×310
d4.84.8777777
Box Weight, g430750165020002100290039506000

Number of “L” type cable glands installed on the side of the box

Side of the box → Gland thread size (cable diameter) ↓ABVGABVGABVGABVGABVGABVGABVGABVG
Схема коробки с указанием сторон и размера резьбы вводаМ20×1,5 (Ø5-13)11191515
М25×1,5 (Ø7-15,5)11113344913
М32×1,5 (Ø11,5-20,5)1222222
М40×1,5 (Ø20,0-28,0)112
М50×1,5 (Ø27,0-36,0)11

Stainless steel

GERDA Box TypeKSN7KSN15KSN16KSN40
Number of InstalledTerminals for conductors up to 4 mm²7151640
Cable glands36912
Box Dimensions L×W×H, mmWith cable glands121x142x61150x142x61171x196x81300x196x81
Housing (without glands)100x100x61150x100x61150x150x81300x150x81
Mounting Dimensions, mmx×y60×6060×110110×110110×260
d10101010
Box Weight, g66599116952815

Number of “L” type cable glands installed on the side of the box

Side of the box → Gland thread size (cable diameter) ↓ABVGABVGABVGABVG
Схема коробки с указанием сторон и размера резьбы вводаМ20×1,5 (Ø5-13)1113355
М25×1,5 (Ø7-15,5)24
М32×1,5 (Ø11,5-20,5)23
М40×1,5 (Ø20,0-28,0)
М50×1,5 (Ø27,0-36,0)

Example of designation when ordering a standard box

  • GERDA–KSA9–1Ex eb IIC T6 Gb X (Standard) TU 3424-010-45416838-2006
    — standard aluminum junction box GERDA-KSA, with Ex marking 1Ex eb IIC T6 Gb X, equipped with 9 screw-through terminals for conductors with a cross-section of up to 4 mm². Each of the four side surfaces has a nickel-plated brass M25×1.5 threaded cable gland for unarmored cable.

  • Drawing of the GERDA-KSA9 aluminum junction box

Fire-resistant junction boxes GERDA-KSN-FR

  • Fire-resistant explosion-proof junction boxes GERDA-KSN-FR are required in hazardous environments:

    • If cable lines and electrical wiring must remain operational during a fire for the time necessary to evacuate people to a safe area and perform essential functions (Article 82 of Federal Law No. 123-FZ “Technical Regulations on Fire Safety Requirements”).
    • In emergency shutdown systems (ESD).
    • The boxes must be used in conjunction with fire-resistant cables.
    • Inside the box, ceramic terminal clamps are installed, designed for operation at temperatures up to +250 °C.
  • Fire-resistant junction box GERDA-KSN-FR
    The box can be manufactured in red color
  • Stainless steel junction box GERDA with terminals

Specifications of GERDA-KSN stainless steel enclosures

GERDA box typeEnclosure size, W×L×H, mmMaximum number of terminals for conductors with a cross-section, mm²DIN railMax. number of “KV” or “L” type cable glands on one side (A, B, C, D); for all other types of glands, the maximum number is half of the indicated value. If different sizes of glands are used on the same side, they should be calculated in percentage ratio.Max. dissipated power, WWeight, g
SizeMax. quantityM20M25M32M40M50M63
2,54610163550A/VB/GA/VB/GA/VB/GA/VB/GA/VB/GA/VB/G
KSN 7100x100x61108·····TS 1512···········6581
KSN 15150x100x611916·····TS 1513···········8737
KSN 16150x150x81191612108··TS 35164332·······121195
KSN 24200x100x61292418····TS 3515···········10934
KSN 47200x200x815848362812··TS 352106443·······191812
KSN 48200x200x121584836281210·TS 35216188854222222242126
KSN 40300x150x814840302420··TS 351174735·······221913
KSN 77300x200x819680602420··TS 352176745·······272387
KSN 78300x200x121968060242015·TS 352281814894423232332790
KSN 79300x300x12196806048201512TS 3522827141497443333433812
KSN 80300x300x16196806048401512TS 352454522211412886654504121
KSN 159380x380x16118915912096814016TS 35358583027181710108865715858
KSN 53400x150x816753423428··TS 351244937·······282390
KSN 105400x200x1211341068468282117TS 3524018208134625242423403
KSN 106400x300x1611341068468282117TS 3526045322120121189674635288
KSN 144500x300x16117214411088742722TS 35280454221281214812694766257
KSN 288500x400x1613442882201321115444TS 354806342282818141212896927353
KSN 178600x200x12121217813454453427TS 35264183282241028272595818
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