Description

IRDH275B‑427 Bender ISOMETER Insulation Monitoring Device

Technical Specifications

• Product Model: IRDH275B‑427
• Brand: Bender
• Warranty: One Year
• Function: ISOMETER® insulation monitor for unearthed IT AC/DC systems
• Monitored System Voltage: AC 0‑793 V, DC 0‑650 V
• Measurement Range: 1 kΩ ~ 10 MΩ dual adjustable alarm thresholds
• Measuring Principle: AMPPlus adaptive measurement for high leakage‑capacitance systems
• Communication: Isolated RS‑485 BMS bus interface, event memory with real‑time clock time‑stamp
• Display: Two‑line LC display for insulation resistance value and status
• Relay Output: Two independent alarm relay outputs
• Mounting: 35 mm DIN‑rail mounting
• Operating Temperature: ‑20 °C ~ +70 °C
• Storage Temperature: ‑40 °C ~ +85 °C
• Protection Class: IP20
• System Compatibility: IT‑type unearthed power systems for ships, mining, medical and industrial drives
• Diagnostics: Automatic self‑test, measuring‑lead‑break monitoring, fault‑event logging
• Humidity: 5‑95 % RH non‑condensing
• Weight: 0.48 kg
• Dimensions: DIN‑rail ISOMETER module footprint
• 

Product Overview

IRDH275B‑427 is Bender ISOMETER insulation monitoring device for unearthed IT power systems. It continuously monitors insulation resistance between live conductors and protective earth, triggers alarm when insulation degrades. AMPPlus measuring principle adapts to systems with high stray leakage capacitance caused by converters and rectifiers. Equipped with time‑stamped fault memory and BMS bus for remote system supervisionBender Ibe…. Surplus and refurbished tested spare insulation‑monitoring unit.

Application Notes

‑ Do not apply to earthed TN / TT power systems. ‑ Set alarm threshold values according to local electrical‑safety requirements. ‑ Typical deployment: IT‑system insulation monitoring device spare‑part stocking.