The Insulation Monitoring Device BENDER IRDH275B-427 is a high-performance insulation monitoring device specifically engineered for unearthed AC and DC systems operating within voltage ranges of 0-793V AC/AC+DC or 0-650V DC. This advanced device incorporates innovative AMPPlus measurement technology, enabling reliable monitoring of complex electrical systems that include modern power components such as rectifiers, frequency converters, and thyristor-controlled drives. It automatically adapts to varying system conditions, including high leakage capacitances resulting from interference suppression measures, ensuring consistent performance in challenging electrical environments.

Featuring two adjustable response thresholds ranging from 1kΩ to 10MΩ, the IRDH275B-427 IT systems BENDER provides differentiated alarm triggering through both pre-warning and main alarm relays. The device offers clear visual indication through alarm LEDs and displays real-time insulation resistance values on its integrated LCD screen or external monitoring instruments. It includes continuous self-monitoring functionality that detects device faults or connection issues, activating a dedicated system fault relay when abnormalities occur, thereby enhancing overall system reliability.

The BENDER IRDH275B-427 Insulation Monitoring Device is equipped with an intuitive control panel featuring Test, Reset, and Info buttons for comprehensive system management. The test function verifies device operation and earth connections, while the info button provides access to critical parameters such as system leakage capacitance. A built-in fault memory stores alarm events, which can be cleared via the reset function. For installations requiring door mounting in distribution panels, BENDER offers compatible variants with similar capabilities to suit different installation requirements.

Designed for demanding applications in medical facilities, industrial plants, and marine environments, the BENDER ground fault detector IRDH275B-427 ensures enhanced electrical safety through reliable ground fault detection. The device features an RS-485 communication interface for integration with building management systems and offers optional external power supply for monitoring de-energized systems. With its IP20 protection rating and compliance with medical equipment standards, the IRDH275B-427 insulation resistance monitor represents a robust and versatile solution for critical power system protection across various industries and applications.