{"product_id":"bender-iso685-d-b-cn-690v-1000v-insulation-monitor-for-ac-dc-it-systems","title":"Bender IRDH275-435 793V 650V Insulation Monitor for AC DC IT Systems","description":"\u003cdiv\u003e\u003cspan\u003eThe IRDH275-435 is a high-performance insulation monitoring device from Bender, part of the ISOMETER® IRDH275 series. It is designed for unearthed AC, AC\/DC, and DC main circuits (IT systems) and continuously monitors the insulation resistance of the system. The device is particularly suitable for modern power supply systems that contain rectifiers, converters, thyristor-controlled DC drives, and directly connected DC components. It complies with IEC 61557‑8 and also meets or exceeds the requirements of NEC 250.21(B) and CEC 10‑106(2) for ground detectors in ungrounded AC systems .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eKey Features \u0026amp; Functions\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Patented AMPPlus Measuring Principle – The IRDH275-435 employs Bender’s patented AMPPlus measuring technology, which automatically adapts to the specific system conditions – including the system’s inherent leakage capacitance – to provide accurate insulation monitoring. This technology is particularly effective in systems with extensive DC components, variable-frequency drives (VFDs), and high leakage capacitances .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Automatic Adaptation to System Leakage Capacitance – Modern power systems often generate high leakage capacitances to earth due to interference suppression measures. The IRDH275-435 automatically adapts to the existing system leakage capacitance (maximum permissible ≤ 500 μF), optimising measurement time and ensuring dependable operation without manual adjustments .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Two Independently Adjustable Response Values – The device features two separately adjustable alarm relays (Alarm 1 and Alarm 2), allowing users to distinguish between pre‑warning and critical alarm. The response value ranges are independently configurable from 1 kΩ to 10 MΩ, offering flexible configuration to meet different system safety requirements .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Two-Line LC Display – Equipped with a clear two-line LC display, the device presents measured insulation resistance values in real time. On‑device operation is facilitated by front‑panel keys, enabling easy on‑site status checks and parameter adjustments .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Built‑In Self‑Test and Connection Monitoring – An automatic self‑test function continuously verifies the internal measuring circuits. Connection monitoring supervises the integrity of the measuring leads between the device, the IT system, and earth (PE). If any fault is detected, the device provides immediate indication, ensuring high functional reliability .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· External Test and Reset Functions – External push‑buttons can be connected to perform device and connection testing, or to clear stored fault messages, enhancing convenience and safety particularly when the device is installed inside a control cabinet .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Selectable Fault Memory – The fault memory function can be activated or deactivated as required (latching or non-latching operation). When enabled, alarm relays remain in the alarm condition until manually reset, helping to identify intermittent faults .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Analog Output – The device provides an analog output for remote display of the measured insulation resistance value, enabling integration with external indicating instruments or monitoring systems .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Voltage Extension via Coupling Devices – The nominal system voltage range can be extended using appropriate Bender coupling devices. With coupling devices, the monitoring range can be extended to higher voltages such as DC 0…1760 V or 3(N)\/AC 0…7200 V, making the device suitable for medium‑ and high‑voltage IT systems .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· De‑Energised System Monitoring – The device is powered by an external supply voltage, allowing it to monitor systems even when the main circuit is de‑energised, ensuring continuous safety oversight during maintenance or system shutdown periods .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Wide Operating Temperature Range – The IRDH275-435 is designed for demanding environments, with an operating temperature range of –40 °C … +70 °C and storage temperature range of –40 °C … +85 °C .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· DIN Rail Mounting – The device is designed for DIN rail mounting according to IEC 60715, making it suitable for installation in control cabinets and distribution panels .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· “W” Option for Harsh Environments – The optional “W” version (e.g., IRDH275W-435) provides improved shock and vibration resistance for use in ships, on rolling stock, and in seismic environments .\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Nominal system voltage (Uₙ): 3(N)AC 0…793 V; AC 0…793 V; DC 0…650 V\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Frequency range (fₙ): DC, 0.2…460 Hz\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Supply voltage (Uₛ): AC 88…264 V (20…460 Hz); DC 77…286 V\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Response value range (Rₐₙ₁ \/ Rₐₙ₂): 1 kΩ … 10 MΩ, two thresholds independently adjustable\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Maximum permissible system leakage capacitance: ≤ 500 μF\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Measuring principle: AMPPlus (patented adaptive measuring pulse method)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Display: Two-line LC display with backlight\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Alarm relays: Two independent changeover contacts (Alarm 1 and Alarm 2), configurable for N\/O or N\/C operation\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Analog output: Yes (for external kΩ display)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Connection monitoring: Yes (monitoring of measuring leads to system and earth)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Self‑test: Automatic device self‑test\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· External functions: Supports connection of external test and reset push‑buttons\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Fault memory: Selectable (latching or non-latching operation)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Operating temperature: –40 °C … +70 °C\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Storage temperature: –40 °C … +85 °C\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Relative humidity: 5…95% (non‑condensing)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Protection class: Terminals IP30, enclosure IP20\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Mounting: DIN rail according to IEC 60715 (35 mm)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Standards compliance: IEC 61557‑8, DIN EN 61557‑8; meets or exceeds NEC 250.21(B), CEC 10‑106(2) for ungrounded AC systems\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Order number: B91065009\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eTypical Applications\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Industrial IT systems – Insulation monitoring for AC, DC, and combined AC\/DC unearthed systems incorporating rectifiers, converters, thyristor-controlled DC drives, variable-frequency drives (VFDs), and other power electronic loads.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· UPS systems and battery systems – Continuous monitoring of insulation integrity in uninterruptible power supplies and battery backup installations.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· IT systems with high leakage capacitance – Installations where interference suppression filters, EMI filters, or long cable runs generate significant leakage capacitance to earth (e.g., large industrial networks, data centres).\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Pure DC and mixed‑voltage networks – Including systems with VFDs and other DC components, where reliable monitoring under fluctuating operational conditions is required.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Extended‑voltage applications – Through coupling devices (e.g., AGH series), the monitoring range can be extended to DC 0…1760 V or 3(N)\/AC 0…7200 V for medium‑ and high‑voltage IT systems.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· De‑energised \/ offline system monitoring – Applications where continuous insulation monitoring is required even when the main circuit is de‑energised, such as during maintenance periods.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Marine and rolling stock applications – For shipboard installations and rail vehicles, the optional “W” version provides enhanced vibration and shock resistance .\u003c\/span\u003e\u003c\/div\u003e","brand":"Bender","offers":[{"title":"Default Title","offer_id":44105629073496,"sku":null,"price":1286.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0580\/2799\/9320\/files\/IRDH275-435....._01143bc6-7bc0-4f54-9061-ea3415d2e196.jpg?v=1778881027","url":"https:\/\/gexufein.com\/products\/bender-iso685-d-b-cn-690v-1000v-insulation-monitor-for-ac-dc-it-systems","provider":"Gexufein Automation","version":"1.0","type":"link"}