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Bender IRDH275B-435&IRDH275BM-727
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Motorola IPMC761
Motorola IPMC761
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Yaskawa JGSM-06
Yaskawa JGSM-06

Bender IRDH275B-435&IRDH275BM-727

Product Introduction:​ Continuously monitors the insulation resistance (to earth/PE) of unearthed power distribution systems (IT systems) using Bender’s AMPPlus® adaptive pulsed measuring principle; detects first insulation fault without tripping the system, enabling safe continued operation with alarm notification.

Category:
Description
Technical Specifications (IRDH275B-435):
  • Monitored System Voltage:​ AC 0–793 V (50/60 Hz, up to 460 Hz), DC 0–650 V; also AC/DC mixed (rectifier-fed) networks
  • Measuring Principle:​ AMPPlus® — injection of symmetrical measuring pulses; immune to capacitive leakage, filters, thyristor/rectifier influence
  • Adjustable Response Value (Rn):​ 1 kΩ – 10 MΩ
  • Alarm Outputs:​ 2 × independently programmable changeover relays (SPDT), 250 VAC / 5 A
  • Display:​ Backlit LC display (2 × 16 characters) showing measured R_iso, system status, fault messages
  • Communication:​ RS-485 (Bender BMS / Modbus optional depending on variant)
  • Supply Voltage:​ AC 88–264 V or DC 77–286 V (self-powered from monitored network possible on some models)
  • Power Consumption:​ ≤ 14 VA
  • Operating Temp:​ -40 °C to +70 °C
  • Mounting:​ 35 mm DIN rail (EN 60715)
  • Protection Degree:​ IP30 (front), IP20 (terminals)
  • Standards:​ IEC 61557-8, EN 50278
    IRDH275BM-727 Note:​ “M” variant typically includes Modbus RTU communication capability and possibly different terminal/supply configuration; BM-727 is the Modbus-enabled version of the 275 series.
    Installation & Notes:​ Connect measuring terminals (L1/L2/L3/N or +/−) directly across the IT system; do NOT connect to grounded side. Earth connection mandatory. For systems with large Y-capacitance to ground, verify measuring range is adequate. Test button provided for functional check.
    Applications:​ Hospital operating room IT mains, marine & offshore platform power, mining conveyor IT distribution, data center UPS DC buses, industrial plant standby generator IT networks.
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