BENDER IRDH265-4 B91068001

Bender IRDH265-4 A-ISOMETER

Description

The Bender IRDH265-4 is an advanced insulation monitoring device designed for unearthed AC, AC/DC, and DC power systems (IT systems). It provides continuous monitoring of the insulation resistance to prevent system downtime and protect against electrical hazards. With its wide voltage range and adjustable response values, this device is a versatile solution for a multitude of industrial applications. Order now from spareparts2day for expert support and fast delivery.

Specifications

• Manufacturer: Bender
• Type: IRDH265-4
• Part Number: B91068001
• System Type: Unearthed systems (IT systems)
• Rated Voltage (Un): 3AC/AC 0…690V, DC 0…500V
• Supply Voltage (Us): 230V AC, 50/60Hz
• Power Consumption: 6.0 VA
• Response Value (RAN1, RAN2): 10…990 kOhm
• Relay Contacts: 2x changeover contacts, AC 250V / 5A
• Display: LCD for measured value and device parameters

Label Info

• Model: IRDH265-4
• Serial No.: 0205509925
• Article No.: B91068001
• Software Version: D74 V2.8-4

Application

This insulation monitor is ideal for critical applications where power supply continuity is essential, including hospitals (operating rooms), industrial control systems, renewable energy installations (solar, wind), and marine applications.

Country of Origin

Germany

CO2 Impact

Opting for this pre-owned unit prevents the emission of approximately 20.0 kg of CO2, which is comparable to the savings from not driving a car for 100 kilometers.

Availability

This item is a tested, used product in excellent working condition. Lifecycle status is ‘Obsolete’, making this a valuable spare part for existing installations.

FAQ

Can the IRDH265-4 be used in DC systems?

Yes, the IRDH265-4 is suitable for unearthed AC, combined AC/DC, and pure DC systems. The rated voltage for DC applications is up to 500V.

What is the purpose of the two alarm relays?

The device features two independent alarm relays (ALARM 1 and ALARM 2). This allows for setting up a pre-alarm and a main alarm at different insulation resistance thresholds, enabling a two-stage warning system for proactive maintenance.

Is this device compatible with modern communication protocols like Modbus?

The standard IRDH265-4 model does not have built-in Modbus or other digital communication protocols. It operates via its relay contacts. For network integration, you would need a different model or a gateway device.

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Last Update: Friday, March 13, 2026