Description
- Product Model: IRDH275B‑435W
- Brand: BENDER (Germany)
- Warranty: One Year
- Input Power Supply: AC 88‑264 V / DC 77‑286 V, ≤14 VA power consumption
- Operating Temperature: ‑10 °C ~ +55 °C
- Storage Temperature: ‑40 °C ~ +85 °C
- Response Time: Adjustable insulation‑fault response delay; internal self‑test cycle <60 s
- Protection Class: Front‑panel IP40, terminal side IP20; DIN‑rail cabinet‑mount unit
- Accuracy Class: ±10 % of measured value (1 kΩ‑1 MΩ measuring range)Bender Amé…
- Output Frequency: N/A (insulation monitoring device)
- Rated Current Range: Two SPDT relay alarm contacts, resistive load 250 VAC / 5 A; analog 0/4‑20 mA signal output (max 500 Ω load)Bender Amé…
- Communication Interface: RS‑485, BMS protocol; ISONET multi‑device networking function
- Supported Protocols: BMS, ISONET bus; event history memory stores up to 300 time‑stamped fault records
- Overload Capacity: Built‑in continuous self‑test; reverse‑polarity and surge protection on measuring terminals; adjustable dual‑level insulation alarm thresholds 1 kΩ‑10 MΩ
- Dimensions: 144 mm × 130 mm × 75 mm, standard 35 mm DIN‑rail footprint
Product Overview
The BENDER IRDH275B‑435W is an ISOMETER® insulation‑monitoring device dedicated for unearthed IT power systems, supporting pure‑AC, pure‑DC and mixed AC‑DC networks including systems with frequency converters and large stray capacitances. Adopting AMPPlus measuring principle, it continuously monitors insulation resistance between live conductors and protective earth, triggers two‑stage relay alarms when insulation degrades. It is equipped with LC text display, local Test/Reset buttons, analog value output and RS‑485 communication for upper‑system remote reading. Historical fault timestamps are saved in on‑board memory for maintenance traceability. It solves typical IT‑system pain points: hidden earth‑fault risk on ungrounded power networks, measurement distortion caused by variable‑frequency drive leakage capacitance, lack of remote data and event logging. Electrical safety engineers, panel‑builders and plant maintenance technicians benefit from dual‑threshold alarm, network‑capable bus interface, self‑diagnosis and drop‑in spare‑part compatibility for existing BENDER IT‑system installations.
Application Scenarios
- Hospital Medical Isolated‑Power Distribution Cabinets: Mounted inside safety‑critical IT‑system power panels for operating‑room and ICU power supplies. Continuously tracks insulation condition, raises pre‑alarm and main alarm before dangerous earth‑fault occurs, protecting patient and equipment safety without immediate power cut‑off.
- Marine & Off‑shore IT‑Network Monitoring: Deployed for shipboard ungrounded power distribution. Adapts complex mixed AC‑DC loads and high‑capacitance cables; historical event log supports post‑fault troubleshooting for marine electrical systems.
- Industrial Drive & Renewable‑Energy IT‑System Cabinets: Used for converter‑rich industrial IT power networks. AMPPlus technology delivers stable readings even with heavy stray capacitance from VFDs; 4‑20 mA and RS485 interfaces feed insulation data to DCS/SCADA supervisory systems.
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