{"product_id":"bender-ir425-d4-2-300v-insulation-monitor-for-ac-dc-it-systems","title":"Bender IR425-D4-1 300V Insulation Monitor for AC DC IT Systems","description":"\u003cdiv\u003e\n\u003cdiv\u003e\u003cspan\u003eThe IR425-D4-1 is an insulation monitoring device from Bender, designed for unearthed AC and DC control circuits (IT systems). It continuously monitors the insulation resistance of systems with voltages from 0 to 300 V AC\/DC and triggers an alarm when the insulation resistance falls below a preset threshold. The device complies with IEC 61557‑8.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eThe IR425-D4-1 uses the AMP measuring principle, which ensures that DC components present in AC\/DC systems do not influence the operating characteristics. An external supply voltage allows de‑energised systems to be monitored as well. The device features a compact 36 mm width (2 standard modules), making it suitable for control cabinet installations where space is limited.\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· Rated system voltage (Uₙ): AC\/DC 0…300 V, 15…460 Hz\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Supply voltage (Uₛ): AC 16…72 V; DC 9.6…94 V\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Frequency range: 15…460 Hz\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Response value range (Rₐₙ): 1 kΩ … 200 kΩ, two independently adjustable thresholds\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Maximum permissible system leakage capacitance (Cₑ): ≤ 20 μF\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Measuring principle: AMP (Adaptive Measuring Principle) – superimposes a pulsating measuring voltage onto the monitored IT system; ohmic insulation faults close the measuring circuit between the IT system and earth\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Power consumption: ≤ 4 VA\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Alarm relays: Two independent changeover contacts (Alarm 1 and Alarm 2), AC 250 V \/ 5 A\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Display: Multi‑function LC display showing current insulation resistance values\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· LED indicators: Power On, Alarm 1 (pre‑warning), Alarm 2 (critical alarm)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Connection type: Screw‑type terminals (each connection point with dual terminals)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Mounting: DIN rail (35 mm standard rail)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Width: 36 mm (2 standard modules)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Dimensions (W × H × D): Approx. 36 × 71 × 90 mm\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Weight: Approx. 0.15 kg\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Operating temperature: –25 °C … +55 °C\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Protection class: Terminals IP20, internal components IP30\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Housing material: Polycarbonate\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Standards compliance: IEC 61557‑8, DIN EN 61557‑8\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\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· AMP Measuring Principle – Uses the Bender AMP measuring principle. The device superimposes a pulsating measuring voltage onto the monitored IT system; ohmic insulation faults close the measuring circuit between the IT system and earth, and the currently measured insulation resistance value is shown on the display. DC components present in AC\/DC systems do not influence the operating characteristics.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Two Independently Adjustable Response Values – Equipped with two independently adjustable alarm relays (Alarm 1 and Alarm 2), with a response value range of 1 kΩ to 200 kΩ. Two‑stage alarm levels (pre‑warning and critical alarm) can be configured.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Preset Function – When the device is first powered on, the preset function automatically measures the rated system voltage and sets basic parameters. When Uₙ ≤ 72 V, the response values are preset to 20 kΩ and 10 kΩ; when Uₙ \u0026gt; 72 V, they are preset to 46 kΩ and 23 kΩ.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Multi‑Function LC Display – Equipped with a multi‑function LC display showing real‑time insulation resistance values, alarm information, and device parameters.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· LED Status Indicators – Front panel includes LED indicators: Power On, Alarm 1 (pre‑warning), Alarm 2 (critical alarm).\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Connection Monitoring – Continuously monitors the connection status of measuring leads (system\/earth) to ensure measuring circuit integrity.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Built‑In Self‑Test with Automatic Alarm – Features an automatic self‑test function that continuously verifies internal measuring circuits and system control components. A fault triggers an automatic alarm.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Internal\/External Test and Reset – Self‑test and reset can be triggered via front‑panel keys, or by connecting external test and reset push‑buttons.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Selectable Fault Memory – The fault memory function can be activated as needed. When activated, 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· Adjustable Response Delay – Response delay time can be configured (0…99 seconds) to prevent nuisance alarms caused by system transients.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Password Protection – Integrated password protection prevents unauthorised changes to critical alarm threshold parameters.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· De‑Energised System Monitoring – Powered by an independent external supply, the device can monitor the system even when the main circuit is de‑energised.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Screw‑Type Terminals – Features screw‑type terminals with dual terminals at each connection point for secure wiring.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Compact Design – 36 mm width (2 standard modules) for space‑saving DIN rail mounting in control cabinets.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eModel Number Explanation\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· IR425 – Product family designation for Bender 425 series insulation monitoring devices\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· D4 – Supply voltage variant: AC 16…72 V \/ DC 9.6…94 V\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· 1 – Terminal type: screw‑type terminals (Version 2 uses push‑wire terminals)\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 control circuits – Monitoring auxiliary and control circuits in machine electrical equipment according to IEC 60204‑1\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Power plant automation – Ensuring insulation integrity of unearthed control systems in power generation facilities\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Elevator systems – Monitoring insulation of DC control panels and safety chains in elevators\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Small AC\/DC IT systems – Such as lighting systems\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· AC\/DC auxiliary circuits – Complying with DIN VDE 0100‑725\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Automation systems – Control circuit insulation monitoring in mechanical engineering and automation equipment\u003c\/span\u003e\u003c\/div\u003e\n\u003cspan\u003e\u003c\/span\u003e\n\u003c\/div\u003e","brand":"Bender","offers":[{"title":"Default Title","offer_id":44126870143064,"sku":null,"price":858.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0580\/2799\/9320\/files\/IR425-D4-2......jpg?v=1779297199","url":"https:\/\/gexufein.com\/products\/bender-ir425-d4-2-300v-insulation-monitor-for-ac-dc-it-systems","provider":"Gexufein Automation","version":"1.0","type":"link"}