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IRDH275-435

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The IRDH275-435 is a DIN-rail mounted insulation monitoring device designed to detect ground faults in AC/DC electrical systems. It features a standard 0–400 μA analog output.
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Technical specifications for IRDH275-435

  • Manufacturer:
    BENDER
  • Part Number:
    IRDH275-435
  • Product Family:
    BENDER
  • Supply Voltage:
    88–264 VAC (42–460 Hz) / 77–286 VDC
  • Analog Output:
    0–400 μA
  • Max System Voltage:
    793 VAC / 650 VDC
  • Wire Size:
    AWG 24 (min) – AWG 12 (max)
  • Mounting:
    DIN-rail
  • Weight:
    0.52 kg
  • Estimated shipping dimensions:
    11.1x11.1x7.7cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.
Description
The IRDH275-435 is a versatile ground fault detector that ensures continuous monitoring of insulation resistance in electrical installations. With its robust DIN-rail mounting design, it integrates seamlessly into control panels and switchgear. 

Equipped with a clear front-panel display and intuitive navigation keys, the IRDH275-435 allows users to view system status, trigger self-tests, and adjust settings through a structured menu system. The analog output of the IRDH275-435 provides a 0–400 μA signal proportional to the measured insulation resistance, which can be integrated into external control or SCADA systems using the provided scaling formulas. 

In terms of installation and wiring, the IRDH275-435 requires a minimum wire size of AWG 24 and a maximum of AWG 12. It is designed for use by qualified personnel only, and all connections must comply with the diagrams provided in the manual. 

The IRDH275-435 is part of the broader IRDH275 series, which includes variants with different supply voltages and output options. For detailed technical specifications, installation guidelines, and safety information, users should refer to the complete user manual (document TGH1361en). 
Alternative Names
IRDH275-427 IRDH275-425 IRDH275B-435 IRDH275B-427
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is the maximum system voltage the IRDH275-435 can monitor without an external voltage coupler?
The IRDH275-435 can directly monitor systems up to 793 VAC or 650 VDC. For higher voltages, an appropriate BENDER voltage coupler (such as AGH150W-4, AGH204S-4, or AGH520S) must be installed between the device and the system.
How do I configure the relay contacts on the IRDH275-435 for failsafe operation?
The IRDH275‑435 allows relay configuration through its onboard menu. To enable failsafe operation for relay K1 or K2, navigate to ISO SETUP > K1 (or K2) in the menu and select the “N/C” (Normally Closed / failsafe) option.
How do I configure the relay contacts on the IRDH275-435 for failsafe operation?
The IRDH275-435 allows relay contact configuration via the menu under ISO SETUP > K1 and ISO SETUP > K2. To set a relay to failsafe (normally energized) mode, select “N/C” in the device settings. The relay will then be energized in the normal state and de-energized in an alarm or power loss condition.
Can the IRDH275-435 be used in DC systems, and what supply voltage does it require?
Yes, the IRDH275-435 supports both AC and DC system monitoring. Its supply voltage range is 88–264 VAC (42–460 Hz) or 77–286 VDC. For DC system voltages above 650 VDC, an appropriate voltage coupler such as the AGH150W-4 (for up to 1600 VDC) must be used.