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Ex power supply


  • 2 channels
  • 5-port 3.75 kVAC galvanic isolation
  • Output voltage > 18 V to I.S. area
  • Active current loop detection
  • Universal supply by AC or DC
  1. Overview +

  2. Technical details +


  • Voltage supply with safety barrier for the supply of equipment mounted in hazardous area.
  • Voltage supply with failsafe detection of active current loop from 2-wire transmitters mounted in hazardous area.

Technical characteristics

  • PR5420B has a relay with change-over contacts available in the safe area. When the loop current is within the defined limit, the relay is ON.
  • Supply and outputs are floating and galvanically separated.

Mounting / installation

  • Mounted vertically or horizontally on a DIN rail. Up to 84 channels per meter can be mounted.

Environmental Conditions

  • Operating temperature

    -20°C to +60°C

  • Calibration temperature


  • Relative humidity

    < 95% RH (non-cond.)

  • Protection degree


Mechanical specifications

  • Dimensions (HxWxD)

    109 x 23.5 x 130 mm

  • Weight approx.

    215 g

  • DIN rail type

    DIN 46277

  • Wire size

    1 x 2.5 mm2 stranded wire

  • Screw terminal torque

    0.5 Nm

Common specifications

  • Supply

  • Supply voltage, universal

    21.6...253 VAC, 50...60 Hz or 19.2...300 VDC

  • Max. required power

    ≤ 4 W (2 channels)

  • Internal power dissipation

    ≤ 2 W (2 channels)

  • Fuse

    400 mA SB / 250 VAC

  • Isolation voltage

  • Isolation voltage, test / working

    3.75 kVAC / 250 VAC


    IEC 61140

  • EMC immunity influence

    < ±0.5%

  • Extended EMC immunity: NAMUR NE21, A criterion, burst

    < ±1%

Output specifications

  • Relay output

  • Max. voltage

    250 VRMS

  • Max. current

    2 ARMS

  • Max. AC power

    100 VA

  • Max. load at 24 VDC

    1 A

  • Output voltage

    > 18 VDC at 20 mA

  • Output current

    28 mA per channel (max.)

  • Relay outputs: On within limit

    > 3.8...< 20.5 mA

Observed authority requirements

  • EMC


  • LVD


  • EAC

    TR-CU 020/2011


  • ATEX 2014/34/EU

    DEMKO 99ATEX126256, II (1) GD [EEx ia] IIC

  • EAC Ex TR-CU 012/2011

    RU C-DK.GB08.V.00410

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