ABB CM-PVE 1SVR550871R9500 Phase Monitoring Relay

The ABB CM-PVE (1SVR550871R9500) phase monitoring relay provides accurate and reliable supervision of three-phase mains in industrial installations. It monitors phase loss, undervoltage, and overvoltage conditions using fixed thresholds matched to common power system requirements. Moreover, its compact DIN-rail housing makes integration straightforward, allowing engineers to maintain consistent voltage quality and prevent equipment damage caused by unstable mains conditions.

2. Functional Highlights / Key Benefits

The CM-PVE delivers stable operation across a wide measuring range of 320–460 V AC, which suits standard three-phase infrastructures used worldwide. It offers a single normally-open output following the closed-circuit principle, thereby ensuring immediate fault indication when a monitored parameter leaves the permitted range. In addition, its fixed thresholds simplify commissioning because engineers can deploy the relay without extensive parameter setup. Therefore, it supports quick installation in both new and retrofit applications.

Key Benefits

• Ensures stable operation of motors, drives, and automation controllers by detecting abnormal voltage conditions.

• Uses a closed-circuit output principle that reliably energizes downstream alarms or interlocks during fault events.

• Features a narrow 22.5 mm housing that saves panel space and supports dense control-cabinet layouts.

• Provides fast electrical response for critical applications requiring continuous three-phase monitoring.

3. Technical Specifications

Electrical Characteristics

• Measuring / control voltage: 320–460 V AC (three-phase)

• Monitored parameters: phase loss, undervoltage, overvoltage

• Output contact: 1 n/o (closed-circuit principle)

• Output contact rating: 250 V / 4 A

Mechanical & Installation Data

• Width: 22.5 mm

• Height: 78 mm

• Depth: 78.5 mm

• Net weight: 0.066 kg

• Mounting: DIN-rail

Additional Features

• Fixed threshold values for simplified commissioning

• Suitable for continuous three-phase mains supervision in industrial environments

4. Typical Applications / System Integration

The CM-PVE is frequently used in motor protection circuits, pump control systems, and automation panels where stable phase voltage is mandatory. For instance, manufacturing lines with heavy induction motors benefit from its fast detection of phase imbalance or undervoltage events. Moreover, building automation systems and HVAC controllers rely on three-phase monitors to maintain safe operation and prevent costly equipment shutdowns. Therefore, the module integrates seamlessly into both compact control boxes and large-scale plant distribution panels.

5. Support, Maintenance & Reliability

ABB designed the CM-PVE for long-term endurance in industrial settings, ensuring stable performance under continuous electrical stress. Its fixed threshold system reduces configuration errors and supports consistent operation across distributed installations. In addition, the relay’s robust mechanical construction and proven ABB component quality help maintenance teams achieve predictable servicing schedules and reduced troubleshooting time.

6. FAQ

Q1: What conditions does the CM-PVE monitor?
It monitors phase loss, undervoltage, and overvoltage across three-phase mains.

Q2: Does the relay require configuration of thresholds?
No, the thresholds are fixed to simplify commissioning and reduce setup time.

Q3: What type of output contact does it use?
It uses a normally-open output contact operating on the closed-circuit principle.

Q4: Is the relay suitable for motor protection systems?
Yes, it is commonly used to protect motors and drives from voltage abnormalities.

Q5: Can this device be installed in compact control panels?
Its slim 22.5 mm housing fits easily into compact DIN-rail-based installations.