Bender – IR425-D4-1 – Insulation Monitor for AC/DC IT-Systems, 15–460 Hz

The Bender IR‑D‑ is a precision insulation monitoring device (ISOMETER) for ungrounded AC/DC control circuits operating between – V. With selectable dual threshold alarms, adjustable response delay, and a multifunction LC display, this two-module unit fits DIN rail applications and ensures early ground fault detection in industrial and safety-critical environments.

• Model / P/N: IR‑D‑ (B / B)  

• System Voltage: – V (AC/DC), – Hz  

• Supply Voltage:

  • DC: .– V

  • AC: – V, – Hz  

• Trip Response: – kΩ adjustable, with dual prewarning and alarm thresholds  

• Enclosure: ‑module ( mm), DIN-rail mount, IP  

• Connections: Push-wire terminals (two per terminal) – B version; screw-type B also common  

• Display & Indicators: LC screen, Power/Alarm LEDs, internal/external test/reset buttons  

• Relay Outputs:  change-over (SPDT) alarm relays, configurable NO/NC & latching options  

• Certifications: IEC ‑ (insulation monitoring), DIN EN ‑, VDE ‑  

• Dimensions: ~ × ×  mm; weight ~. lb (~. kg)