The AC and DC IT systems BENDER IRDH275-427 is a high-performance insulation monitoring device designed for unearthed AC/DC systems (0-793V AC/AC+DC or 0-650V DC). Utilizing the innovative AMPPlus measurement technology, it effectively monitors systems with modern power supplies containing rectifiers, converters, and thyristor-controlled drives. The Insulation Monitoring Device IRDH275-427 BENDER automatically adapts to varying system conditions, including high leakage capacitances caused by interference suppression measures, ensuring reliable operation in complex electrical environments.

This ISOMETER® device offers two adjustable response thresholds (1kΩ to 10MΩ) for differentiated alarm triggering, with both pre-warning and main alarm relays. The BENDER IRDH275-427 in stock provides clear visual indication through alarm LEDs and displays real-time insulation resistance values on its LCD screen or external instruments. Its continuous self-monitoring function detects device faults or connection issues, activating a dedicated system fault relay when abnormalities occur. The unit can be extended for higher voltage applications when used with appropriate coupling devices.

The Insulation Monitoring Device IRDH275-427 BENDER features an intuitive control panel with Test, Reset, and Info buttons for comprehensive system management. The test function verifies device operation and earth connections, while the info button accesses critical parameters like system leakage capacitance. A built-in fault memory stores alarm events, which can be cleared via the reset button. For installations requiring door mounting in distribution panels, BENDER offers the IRDH375(B) variant with similar capabilities.

Ideal for medical facilities, industrial plants, and marine applications, the BENDER IRDH275-427 AC and DC IT systems ensures electrical safety in demanding environments. Its RS-485 communication interface enables integration with building management systems, while the optional external power supply allows monitoring of de-energized systems. With its IP20 protection and medical equipment compliance, this insulation monitor represents a robust solution for critical power system protection.