Description

IRDH275-435 (3BHB035096R0001) Insulation Monitoring Device

Technical Specifications

• Product Model: IRDH275-435 3BHB035096R0001
• Brand: ABB
• Warranty: One Year
• Input Voltage: 24–240 V AC/DC universal supply
• Operating Temperature: -20°C to +60°C
• Storage Temperature: -40°C to +85°C
• Response Time: ≤ 5 s insulation fault detection and alarm output
• Protection Class: IP20 (DIN rail mounted inside control cabinet)
• Accuracy Class: 5% deviation on resistance measurement
• Output Frequency: Compatible with 50/60 Hz power grids
• Rated Current Range: Max 0.12 A operating power consumption
• Communication Interface: RS485
• Supported Protocols: Modbus RTU
• Overload Capacity: Overvoltage, reverse polarity and transient surge internal protection
• Dimensions: 90 mm × 72 mm × 63 mm

Product Overview

The IRDH275-435 3BHB035096R0001 is a professional insulation monitoring relay designed for unearthed IT power distribution systems in industrial equipment, marine vessels and power auxiliary control circuits. It continuously measures the insulation resistance between live conductors and protective earth, automatically triggering alarm outputs when cable aging, water ingress, wire abrasion or component degradation causes insulation degradation. This device eliminates hidden safety hazards of single earth faults in ungrounded power networks, which can evolve into destructive short circuits, equipment burnout or electric shock risks without timely intervention. It replaces manual periodic megohmmeter testing, reduces human error in resistance reading and cuts routine inspection workload for electrical teams. Plant electrical supervisors, panel builders, marine automation technicians and safety compliance officers gain long-term operational value from its continuous online monitoring and remote data transmission capability. Equipped with clear front-panel LED indicators and threshold adjustable potentiometers, the unit logs fault events locally, transmits real-time insulation values to PLC and SCADA systems via Modbus RTU, and complies with IEC 61557-8 standards for IT system insulation supervision.

Core Functional Features

1. Continuous 24/7 insulation resistance monitoring exclusively for IT isolated power supply networks
2. Two independent relay alarm outputs for pre-alarm and critical fault grading to implement layered equipment protection
3. RS485 Modbus RTU communication interface for remote parameter setup, real-time data reading and historical fault log upload
4. User-adjustable insulation resistance threshold via front rotary potentiometer to match different voltage level distribution loops
5. Wide-range 24–240 V AC/DC power supply fits global control cabinet auxiliary power specifications
6. Standard 35 mm DIN rail snap-on mounting for fast installation and replacement inside low-voltage enclosures
7. Built-in transient voltage suppression circuit resists EMC interference from inverters, contactors and high-power switching loads