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The IRDH275B-435 is an ISOMETER® series device for online insulation monitoring in IT systems, featuring hardware components such as a backlit LCD, RS-485 communication, disconnect relays, and a 4...20mA output. This device connects directly to AC 0...793V or DC 0...650V main circuits, and the suffix "-435" represents its support for an AC 88...264V or DC 77...286V auxiliary supply.
Connection monitoring
Built-in test signal generator
Automatic periodic self-test function
The core value of this device lies in its integration of Bender's patented AMP Plus measurement technology. This adaptive pulse measurement method breaks through the physical limitations of traditional DC injection or pure AC injection techniques. It dynamically analyzes the actual system leakage capacitance and background grid interference noise of the measured main circuit in real time, and automatically adjusts the period, width, and amplitude of the internal measurement pulses within milliseconds based on the analysis results.
This enables the device to not only cover pure AC (AC 0...793 V) or pure DC (DC 0...650 V) systems, but also comprehensively monitor hybrid AC/DC systems featuring multi-phase frequency inverter loads. Even under severe waveform distortion, the device effectively filters out harmonic stray disturbances, accurately extracting the true insulation resistance value to ground, thereby eliminating false alarms caused by capacitive charging currents or high-frequency switching noise from frequency inverters.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
BENDER IRDH275B-435 Insulation Monitoring Device Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Marine and Offshore Engineering
Monitors the insulation of ship main distribution grids, electric propulsion systems, and deck machinery to prevent total blackout caused by a single ground fault during voyages.
Rail Transit
Applied in locomotive traction substations, signaling power systems, and station uninterruptible power supplies (UPS) to ensure train control signals are not interrupted by ground short circuits.
Metallurgy and Steel Industry
Online monitors blast furnace control systems and high-power steel rolling frequency drive systems to avoid massive economic losses from sudden shutdowns during continuous smelting or rolling.
Oil and Gas Extraction
Used in IT distribution networks for offshore drilling platforms and onshore oil/gas well pumping systems to prevent ground arcing from causing fires in flammable and explosive environments.
Chemical and Petrochemical Industry
Monitors low-voltage IT systems of mixers, electric heaters, and automated production lines to guarantee uninterrupted power supply for high-risk chemical reaction processes.
Wind Power Generation
Installed in frequency inverters and control cabinets within wind turbine nacelles to resist mechanical vibrations and high-frequency grid interference while accurately monitoring insulation.
When using the IRDH275B-435 it is strictly prohibited to activate multiple insulation monitoring devices simultaneously within the same interconnected IT system, so the built-in disconnect relays must be utilized for interlocking separation to prevent measurement interference.
Meanwhile you must ensure that the L1/L2/L3 sampling lines and E/KE dual-ground wires are securely connected to prevent false alarms caused by disconnection and verify that the auxiliary supply voltage matches before powering on the device.
Alternative Names
Alternative Names
IRDH275B 4351RDH275B-435
Technical notes
Technical notes
The IRDH275B-435 features an innovative adaptive pulse measurement method that automatically adjusts the measuring cycle based on the actual system leakage capacitance to ground and grid interference.
It is an insulation monitoring device for ungrounded IT systems.
How to use the IRDH275B-435 model?
Connect it between the phase and ground, it monitors automatically after power-on.
What is the core function of the IRDH275B-435 model?
Monitors insulation resistance to ground and alarms during faults.
What networks suit the IRDH275B-435 model?
Ungrounded AC and DC systems with complex devices like inverters.
How many parts do you have in stock?
We have an extensive stock base consisting of ten thousands of new and discontinued automation parts including those from leading manufacturers such as:Control Systems (DCS, PLC, CNC) ,Panel Controllers,HMI and Display Panels,Drives,Encoders and Resolvers,Power Supplies.
Do you offer global delivery services?
yes. We ship globally, and we are able to quickly deliver parts globally to any corner of the world. Unless otherwise specified, we will ship your order via (DHL). We can also ship through FedEx, UPS, and TNT. We can also use your account.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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