The IRDH275-4227 is a high-performance insulation monitoring device from Bender, designed for unearthed AC, 3AC, and DC power systems (IT systems). It continuously monitors the insulation resistance of the main circuit and is suitable for modern power supply systems that contain rectifiers, frequency converters, thyristor-controlled DC drives, and directly connected DC components. The device complies with IEC 61557‑8.
Technical Specifications
· Rated system voltage (Uₙ): 3AC/AC 0…150 V; DC 0…150 V
· Response value (Rₐₙ): 1 kΩ … 10 MΩ (two independently adjustable thresholds)
· Supply voltage (Uₛ): DC 19.2…36 V
· Power consumption: 8.0 VA
· Relay contact rating: AC 250 V, 5 A
Key Features
· AMPPlus Measuring Principle – Uses Bender's patented AMPPlus measuring technology, delivering accurate insulation monitoring even in systems with extensive DC components and high leakage capacitances.
· Automatic Adaptation to System Leakage Capacitance – Automatically adapts to the existing system leakage capacitance (maximum permissible ≤ 500 μF), optimising measurement time without manual adjustments.
· Two Independently Adjustable Response Values – Features two separately adjustable alarm relays, each configurable from 1 kΩ to 10 MΩ.
· Two-Line LC Display – Equipped with a clear two-line LC display with backlight, showing real-time insulation resistance values.
· Alarm Indicators – Front panel includes three LED indicators: AL1 LED (pre-warning), AL2 LED (critical alarm), and System Fault LED.
· Built‑In Self‑Test and Connection Monitoring – Automatic self-test continuously verifies internal measuring circuits and system components. The TEST button can manually trigger a test.
· External Test and Reset Functions – Supports connection of external test and reset push-buttons.
· Standby Contact – Includes a standby contact. When the contact is closed, insulation measurements stop.
· De‑Energised System Monitoring – Powered by an independent external supply, the device can monitor the system even when the main circuit is de‑energised.
· Voltage Extension via Coupling Devices – Using Bender AGH series coupling devices, the nominal system voltage range can be extended to higher levels.
Approvals
· CE
· ISO 9001
· UL Listed
Standards Compliance
· IEC 61557‑8
· DIN EN 61557‑8
Typical Applications
· Industrial IT systems
· Medical locations (operating theatres, ICUs)
· Marine and offshore applications
· UPS and battery systems
· Photovoltaic and renewable energy systems
· Extended voltage applications (with AGH coupling devices)
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