Description
📌 Product Overview
The BENDER IRDH275B-435, part number B91065101, is an ISOMETER insulation monitoring device designed for continuous monitoring of insulation resistance in unearthed IT power systems.
The device can be used in 3-phase AC, AC/DC, and DC systems within its specified nominal voltage range. It continuously monitors the insulation condition between the active IT system and protective earth and provides an alarm when insulation resistance falls below the configured response value.
The IRDH275B version includes additional communication and monitoring features, including a BMS interface and integrated memory with a real-time clock. It is suitable for industrial power systems where early detection of insulation faults is important for system availability and electrical safety.
⚙️ Key Features
🔹 Continuous insulation resistance monitoring
🔹 Designed for unearthed IT power systems
🔹 Suitable for 3(N)AC, AC/DC, and DC systems
🔹 Nominal system voltage up to 793 VAC or 650 VDC
🔹 Wide-range AC/DC auxiliary supply
🔹 BMS communication interface
🔹 0(4)–20 mA current output
🔹 Integrated real-time clock
🔹 Internal memory functions
🔹 Automatic adaptation to system leakage capacitance
🔹 LCD display for measured values and parameters
🔹 Adjustable response values
🔹 Suitable for industrial electrical safety applications
📋 Product Datasheet
🏷️ Brand: BENDER
🔢 Model: IRDH275B-435
📌 Article Number: B91065101
🧩 Product Type: Insulation Monitoring Device
📚 Series: ISOMETER IRDH275B
⚡ Monitored System: Unearthed IT System
🔌 Nominal System Voltage: 3(N)AC 0–793 V
🔋 DC System Voltage: 0–650 VDC
⚡ AC Supply Voltage: 88–264 VAC
🔋 DC Supply Voltage: 77–286 VDC
📡 Communication Interface: BMS Interface
📊 Analog Output: 0(4)–20 mA
🧠 Memory: Integrated Memory
🕒 Real-Time Clock: Integrated
📺 Display: LCD Display
⚙️ Measurement Principle: Microprocessor-Controlled Pulsating Measuring Voltage
🔄 System Leakage Capacitance: Automatic Adaptation
📐 Approximate Dimensions: 110 × 110 × 80 mm
⚖️ Approximate Weight: 1.0 kg
🏭 Country of Origin: Germany
📦 Listed Condition: New – Open Box
The IRDH275B-435 is specifically identified by BENDER as article number B91065101. Its monitored nominal voltage is rated for systems up to 3(N)AC 0–793 V or DC 0–650 V, while the device supply accepts AC 88–264 V or DC 77–286 V.
🏭 Typical Applications
⚡ Industrial IT Power Systems
Used to continuously monitor insulation resistance in unearthed industrial electrical systems.
🏭 Large Industrial Plants
Suitable for installations where an insulation fault should be detected early without immediately disconnecting the entire power system.
🔄 AC/DC Drive Systems
Can be used in systems containing converters, rectifiers, and thyristor-controlled DC drives.
⚙️ Process Industries
Suitable for power monitoring applications in chemical plants, manufacturing facilities, energy systems, and other critical industrial environments.
🛠️ Electrical Maintenance
Provides insulation information that can assist maintenance teams in identifying deterioration in system insulation before a more serious earth fault develops.
🔧 Installation and Maintenance Notes
🔧 Verify that the monitored electrical network is an unearthed IT system.
🔧 Confirm that the nominal system voltage does not exceed the specified monitoring range.
🔧 Connect the device between the IT system and the protective earth conductor according to the applicable wiring documentation.
🔧 Verify the auxiliary supply voltage before energizing the device.
🔧 Configure the required insulation resistance response values.
🔧 Check BMS communication settings when integrating the unit into a compatible BENDER monitoring network.
🔧 Verify the analog output configuration before connecting it to external monitoring equipment.
🔧 Inspect system wiring and protective-earth connections during periodic maintenance.
🔧 Perform functional testing according to the plant’s approved electrical maintenance procedures.
The device uses a microprocessor-controlled measuring principle and automatically adapts to the leakage capacitance of the monitored IT system.
❓ FAQ
Q: What is the BENDER IRDH275B-435?
A: It is an insulation monitoring device designed for continuous monitoring of insulation resistance in unearthed IT electrical systems.
Q: What is the article number for IRDH275B-435?
A: The article number is B91065101.
Q: What system voltage can it monitor?
A: It is designed for systems up to 3(N)AC 0–793 V or DC 0–650 V.
Q: What supply voltage does the -435 version require?
A: The IRDH275B-435 accepts an auxiliary supply of 88–264 VAC or 77–286 VDC.
Q: What is the difference between IRDH275 and IRDH275B?
A: The IRDH275B version includes additional features such as the BMS interface, memory, real-time clock, and associated communication functions.
Q: Does it provide an analog output?
A: Yes. The IRDH275B version provides a 0(4)–20 mA current output.
Q: Can it be used with AC/DC drive systems?
A: Yes. The IRDH275 family is designed for universal use in 3(N)AC, AC/DC, and DC systems, including systems with converter and controlled-drive loads.
Q: Is this a PLC processor module?
A: No. Some marketplace categories may classify industrial equipment broadly, but the IRDH275B-435 is specifically an insulation monitoring device.
Q: What should be checked before ordering a replacement?
A: Verify the complete model number, B91065101 article number, system voltage, auxiliary supply, communication requirements, output configuration, mounting arrangement, and existing system compatibility.
🔄 Other BENDER Models You May Also Need
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🏷️ Recommended Short Title
BENDER | IRDH275B-435 B91065101 | ISOMETER Insulation Monitor
