Bender IRDH575B1W-435 ISOMETER Insulation Monitoring Device

Product Description

The IRDH575B1W-435 (B91065500W) is Bender ISOMETER® insulation monitor for unearthed IT power systems, suitable for 3(N)AC, DC and AC/DC mixed systems. The W variant provides enhanced shock and vibration resistance, designed for marine, offshore and heavy industrial environments. It monitors insulation resistance to earth, supports pre-alarm and main alarm, and can work with EDS series modules for insulation fault location. It is equipped with backlit LCD display, RS485 BMS communication and isolated analog output.

Features

• Part No: IRDH575B1W-435, Bender order code: B91065500W
• Measuring range: 20–575V AC / DC, 50–460Hz
• Power supply: AC 88–264V / DC 77–286V
• Two independent adjustable alarm relays (prewarning + fault alarm)
• Isolated 0/4–20mA analog output, RS485 Bender BMS protocol
• W suffix: reinforced vibration & shock resistance for marine/offshore
• 4-line backlit LCD, local setting, test and reset function
• Automatic self-test, memory for fault records
• Panel mount, IP40 front; compatible with EDS fault location system

Applications

• Offshore platform, marine vessel, shipboard IT power distribution
• Oil & gas, mining, steel mill ungrounded power supply systems
• Variable frequency drive, converter and DC drive power loops
• Medical power system, battery energy storage IT network
• Legacy Bender IRDH575 series spare replacement and retrofit

FAQ

Q: What does W stand for in IRDH575B1W-435?
A: W means enhanced vibration and shock resistance version, optimized for marine and offshore working conditions.

Q: What is the difference between IRDH575B1-435 and IRDH575B1W-435?
A: IRDH575B1-435 is standard industrial version; B1W-435 is marine reinforced anti-vibration variant.

Q: Is this device discontinued?
A: This legacy IRDH575 series is end-of-life, supplied as surplus, refurbished and tested spare parts only.

Q: Can it locate insulation faults?
A: It can only monitor insulation resistance alone; it needs to cooperate with EDS4 series fault locators to realize branch fault location.