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ABB CM-IWS.1S | Insulation Monitoring Relay for AC/DC IT Systems

Overview

The ABB CM-IWS.1S is a high-performance insulation monitoring relay designed for use in IT systems (ungrounded networks). It continuously monitors the insulation resistance between conductors and earth, ensuring safe operation and early fault detection in AC, DC, and mixed voltage systems.

Key Features

• Insulation monitoring for IT systems (AC, DC, and mixed networks)

• Adjustable response value: 1 kΩ to 200 kΩ

• Integrated test and reset functions

• LED indicators for status and fault visualization

• 1 c/o (SPDT) relay output

• Automatic or manual reset selectable

• Wide operating voltage range

Technical Specifications

• Model: CM-IWS.1S

• Measuring Voltage Range: 24–440 V AC/DC

• Response Value Range: 1–200 kΩ (adjustable)

• Relay Output: 1 changeover contact (SPDT)

• Rated Frequency: 45–400 Hz

• Power Supply: Internal from measured system

• Mounting: DIN rail (35 mm)

• Standards: IEC/EN 61557-8, IEC/EN 60255

• Dimensions (HxWxD): 90 x 22.5 x 103 mm

• Operating Temperature: –25 to +60 °C

Applications

• Hospitals and medical equipment

• UPS and battery backup systems

• Industrial control panels

• Railway and marine systems

• Data centers and sensitive electronics

Why Choose the ABB CM-IWS.1S?

• Reliable fault detection in IT networks

• Prevents unexpected shutdowns

• Compact DIN-rail housing

• Supports both AC and DC systems

• Trusted ABB quality and compliance with international standards

Order Now

Global delivery available.