Kit of three intrinsic protection Zener barriers, for connection of devices in ATEX area with devices in safe area, housed in an ABS box.
Kit of three intrinsic protection Zener barriers, for connection of devices in ATEX area with devices in safe area, housed in an ABS box. Marking of single barrier: ATEX II (1) GD [Ex ia Ga] IIC [Ex ia Da] IIIC. Marking of the whole box with three Zener barriers: ATEX II 3(1)G Ex nA [ia Ga] IIC T4 Gc (-20°C ≤ Ta ≤ +40°C) for gas ATEX II 3(1)D Ex tb [ia Da] IIIC T130°C Dc IP65 (-20°C ≤ Ta ≤ +40°C) for dust.
Kit of three intrinsic protection Zener barriers, for connection of devices in ATEX area with devices in safe area, housed in an ABS box.

"KMB4" Box With Passive Safety Zener Barriers, For ATEX Environments

By Dini Argeo

The KMB4 range provides ATEX-certified passive Zener barriers for the intrinsically safe connection of up to 4 × 350 Ω load cells in Zone 1 gas and Zone 21 dust hazardous areas. Available as a complete kit of three barriers in an IP65 ABS enclosure (KMB4), or as individual DIN rail barriers for the supply (ZBPW), signal (ZBSG), and sense (ZBSN) lines.

Model
£915.00
Product Information

KMB4 — Passive Safety Zener Barriers for ATEX Load Cell Connections

The KMB4 range provides ATEX-certified passive Zener barriers for the intrinsically safe connection of load cells to weighing systems in hazardous areas. Available as a complete kit of three barriers housed in a ready-to-install IP65 ABS enclosure (KMB4), or as individual DIN rail barriers for supply (ZBPW), signal (ZBSG), and sense (ZBSN) lines, the range offers flexible configuration for Zone 1 gas and Zone 21 dust environments.

Key Features

  • Supports connection of up to 4 × 350 Ω load cells per barrier set.
  • Three dedicated barriers protect the supply, signal, and sense lines independently for maximum signal integrity.
  • Individual barriers (ZBPW, ZBSG, ZBSN) are suitable for DIN rail mounting in a safe area or installation inside an explosion-proof enclosure.
  • KMB4 kit provides all three barriers pre-installed in an ATEX-certified IP65 ABS enclosure — ready for direct field installation.
  • All barriers carry ATEX II (1) GD marking for Zone 1 gas and Zone 21 dust environments.

Available Models

  • KMB4 — Kit of 3 Zener barriers (ZBPW + ZBSG + ZBSN) in an IP65 ABS enclosure. ATEX marking: II 3(1)G Ex nA <ia Ga> IIC T4 Gc (−20 °C ≤ Ta ≤ +40 °C) for gas; II 3(1)D Ex tb <ia Da> IIIC T130 °C Dc IP65 (−20 °C ≤ Ta ≤ +40 °C) for dust.
  • ZBPW — Single Zener barrier for load cell supply. DIN rail mount. ATEX II (1) GD <Ex ia Ga> IIC <Ex ia Da> IIIC.
  • ZBSG — Single Zener barrier for load cell signal. DIN rail mount. ATEX II (1) GD <Ex ia Ga> IIC <Ex ia Da> IIIC.
  • ZBSN — Single Zener barrier for load cell sense. DIN rail mount. ATEX II (1) GD <Ex ia Ga> IIC <Ex ia Da> IIIC.

Single Channel Electrical Parameters

Signal & Sense Barrier (ZBSG / ZBSN) — Um = 250 V:

  • Fuse: 50 mA  |  Uo: 17.4 V  |  Io: 25 mA  |  Po: 0.11 W
  • Co: 0.346 µF  |  Lo: 56.88 mH  |  Rmin: 705.6 Ω

Supply Barrier (ZBPW) — Um = 250 V:

  • Fuse: 100 mA  |  Uo: 24 V  |  Io: 164 mA  |  Po: 0.98 W
  • Co: 0.125 µF  |  Lo: 1.32 mH  |  Rmin: 147 Ω

Note: Combining two or more Zener barriers classified (1)GD <Ex ia> requires the overall assembly marking to be upgraded to (2)GD <Ex ib> in accordance with EN 60079-14.
Specification

Signal & Sense Barrier (ZBSG / ZBSN)

  • Maximum Security Voltage (Um): 250 V
  • Fuse: 50 mA
  • Uo: 17.4 V | Io: 25 mA | Po: 0.11 W
  • Co: 0.346 µF | Lo: 56.88 mH | Rmin: 705.6 Ω

Supply Barrier (ZBPW)

  • Maximum Security Voltage (Um): 250 V
  • Fuse: 100 mA
  • Uo: 24 V | Io: 164 mA | Po: 0.98 W
  • Co: 0.125 µF | Lo: 1.32 mH | Rmin: 147 Ω

Load Cell Compatibility

  • Maximum load cells: 4 × 350 Ω
  • Protected lines: Supply, Signal, Sense

ATEX Certification — Individual Barriers (ZBPW / ZBSG / ZBSN)

  • Marking: ATEX II (1) GD <Ex ia Ga> IIC <Ex ia Da> IIIC
  • Installation: DIN rail (safe area) or explosion-proof enclosure

ATEX Certification — KMB4 Enclosure Kit

  • Gas: ATEX II 3(1)G Ex nA <ia Ga> IIC T4 Gc | −20 °C ≤ Ta ≤ +40 °C
  • Dust: ATEX II 3(1)D Ex tb <ia Da> IIIC T130 °C Dc IP65 | −20 °C ≤ Ta ≤ +40 °C
  • Enclosure material: ABS | Protection: IP65
  • Weight: 2 kg

Standards & Compliance

  • EN 60079-14 (Electrical installations in hazardous areas)
  • ATEX Directive compliant
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