The IRDH265-4 is an insulation monitoring device from Bender, designed for unearthed systems (IT systems). It is used for real-time monitoring of insulation resistance in three-phase AC, AC, and DC main circuits, triggering an alarm when the insulation resistance falls below a preset threshold to ensure electrical system safety.
Technical Specifications
· Rated voltage (Uₙ): 3AC/AC 0…690 V; DC 0…500 V
· Response value (Rₐₙ): 10 kΩ … 990 kΩ, two independently adjustable thresholds
· Supply voltage (Uₛ): AC 230 V, 50/60 Hz
· Power consumption: 6.0 VA
· Relay contact rating: AC 250 V, 5 A
· Software version: D74 V2.8-4
· Order number: B91068001
· Data sheet: TGH 1249
Key Features
· AMP Measuring Principle – Uses Bender‘s AMP (Adaptive Measuring Principle) technology, automatically adapting to system leakage capacitance and accurately distinguishing between actual insulation faults and inherent system leakage capacitance.
· Two Independently Adjustable Alarm Response Values – Equipped with two independently adjustable alarm relays, with a response value range of 10 kΩ to 990 kΩ.
· LCD Display – Features an LCD display showing real-time insulation resistance values and other parameters.
· LED Alarm Indicators – Front panel equipped with alarm LED indicators.
· Connection Monitoring – Continuously monitors the connection status of measuring leads and earth.
· Automatic Device Self-Test – Features an automatic self-test function, which can be manually triggered via the front panel TEST button.
· External Test and Reset Functions – Supports connection of external test and reset push-buttons.
· RS-485 Communication Interface – Equipped with an RS-485 communication interface.
· 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 – The rated system voltage range can be extended using Bender AGH series coupling devices.
Approvals
· CE, ISO 9001, UL US LISTED
Standards Compliance
· IEC 61557‑8
· DIN EN 61557‑8
Typical Applications
· Industrial IT systems
· UPS systems and battery systems
· Photovoltaic and renewable energy systems
· Marine and offshore applications
· Medical locations
· Extended voltage applications (with AGH coupling devices)
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