Excellent PLC
Product Introduction
The ABB CM-IWS.1S Insulation Monitoring Relay is a compact and highly reliable device designed to continuously monitor insulation resistance in unearthed (IT) AC and DC power systems. It plays a critical role in detecting insulation faults at an early stage, helping to prevent equipment damage, unplanned downtime, and safety risks in industrial and infrastructure applications.
The CM-IWS.1S operates by continuously measuring the insulation resistance between live conductors and earth. When the resistance drops below a preset threshold, the relay triggers an alarm, allowing maintenance personnel to take corrective action before a critical fault develops. This makes it especially valuable in systems where uninterrupted operation is required, such as control circuits, power distribution systems, and automation installations.
Designed with ABB’s proven relay technology, the CM-IWS.1S combines accuracy, stability, and long-term reliability in a slim housing. Its standardized control voltage and clear signaling behavior make it easy to integrate into both new installations and retrofit projects.
Product Specifications
| Parameter | Description |
|---|---|
| Product Type | Insulation Monitoring Relay |
| Model | CM-IWS.1S |
| ABB Part Number | 1SVR730660R0100 |
| Monitored System Type | Ungrounded (IT) AC and DC systems |
| Measuring Principle | Continuous insulation resistance measurement |
| Response Behavior | Alarm output when insulation resistance falls below set value |
| Rated Control Supply Voltage | 24–240 V AC/DC |
| Measuring Voltage | Internal, low-level DC measuring signal |
| Alarm Output | Relay contact (changeover) |
| Adjustment Range | Adjustable insulation resistance threshold |
| Time Delay | Adjustable response delay to avoid nuisance alarms |
| Indication | LED status indicators for power and fault |
| Mounting Type | DIN-rail mounting |
| Protection Class | IP20 |
| Operating Temperature | -25°C to +60°C |
| Dimensions | 103.7 × 22.5 × 85.6 mm |
| Weight | 0.148 kg |
Applications
• Industrial power distribution systems, monitoring insulation integrity in IT networks
• Control and automation circuits, ensuring early detection of insulation degradation
• Process industry installations, where uninterrupted operation is critical
• Machine control panels, protecting sensitive equipment from insulation faults
• Infrastructure and utility systems, enhancing electrical safety and reliability
Advantages
• Continuous insulation monitoring, enabling early fault detection
• Wide control voltage range, suitable for diverse AC and DC systems
• Adjustable response settings, reducing false alarms
• Compact DIN-rail design, ideal for space-constrained panels
• Clear status indication, simplifying diagnostics and maintenance
• High reliability, designed for continuous industrial operation
• Improved system safety, minimizing risk of electrical failures
