Bender IRDH275BW-435 Insulation Monitoring Device
Brand： BENDER
Model number： IRDH275BW-435
Colour：new
Warranty: 12 months
Lead Time：3-day working day
Country of origin: USA Price: Please contact us
Product weight：0.58kg
Shipping Port: China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
Bender IRDH275BW-435 Insulation Monitoring Device
1. Product Description
The IRDH275BW-435 monitors the insulation resistance ($R_F$) of unearthed AC, AC/DC, and DC systems. It uses the patented AMPPlus measurement principle, which allows it to handle modern power electronics like frequency converters and rectifiers, even in systems with high leakage capacitance.
2. Technical Specifications
| Parameter | Value / Specification |
| Nominal System Voltage ($U_n$) | AC 0–793 V / DC 0–650 V |
| Supply Voltage ($U_s$) | AC 88–264 V / DC 77–286 V |
| Frequency Range ($f_n$) | DC, 0.2–460 Hz |
| Response Values ($R_{an1} / R_{an2}$) | 1 kΩ – 10 MΩ (two separate adjustable alarms) |
| Measurement Principle | AMPPlus (Adaptive Measurement Pulse) |
| System Leakage Capacitance ($C_e$) | Automatic adaptation up to 500 μF |
| Interface | RS-485 with BMS protocol |
| Relay Contacts | 2 x 1 changeover contacts (SPDT) |
| Protection Class / Option W | High shock (30 g) and vibration resistance |
3. Key Advantages
Universal Application: Works across AC, DC, and mixed systems with rectifiers or converters.
Advanced Fault Detection: Capable of detecting symmetrical and asymmetrical insulation faults.
AMPPlus Technology: Eliminates measurement errors caused by DC components or system interference from variable speed drives.
Ruggedized (Option W): Specifically reinforced for high-stress environments such as marine, mobile equipment, or seismic zones.
BMS Interface: Allows seamless communication with other Bender devices and integration into higher-level monitoring systems.
4. Product Application
The device is ideal for critical infrastructure where power continuity is essential:
Industrial Plants: Chemical, oil and gas, and manufacturing lines with frequency-controlled drives.
Maritime & Offshore: Shipboard electrical systems and oil platforms (due to Option W).
Power Generation: Photovoltaic systems and wind power plants.
Rolling Stock: Railway applications and heavy machinery.
5. Precautions & Maintenance
Single Device Rule: Only one insulation monitoring device may be connected to an interconnected IT system.
Installation: Ensure the connection to the system ($L1/+, L2/-$) and the protective earth ($PE/KE$) is secure. Use redundant $PE$ connections for safety.
Testing: Regularly perform a self-test using the "TEST" button to ensure the internal circuitry and alarm relays are functioning correctly.
De-energized Monitoring: Since it has a separate supply voltage ($U_s$), it continues to monitor the system even when the main circuit is switched off.
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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