1SVR550871R9500 ABB CM-PVE Phase Failure Overvoltage and Undervoltage Monitoring Relay 320-460 V AC

Why Choose the ABB CM-PVE Phase Failure and Voltage Monitoring Relay?

The ABB CM-PVE (1SVR550871R9500) is a compact and reliable three-phase monitoring relay designed to detect phase failure, overvoltage and undervoltage in industrial AC electrical systems. As part of the ABB CM-PVE monitoring relay series, it provides dependable supply supervision for industrial motors, electrical distribution equipment and automated machinery.

This phase and voltage monitoring relay continuously supervises the connected three-phase supply, helping identify electrical conditions that could cause motor overheating, equipment malfunction or unexpected production downtime. Its fixed overvoltage and undervoltage monitoring thresholds simplify operation, while its integrated normally open relay contact enables connection to compatible motor contactors, alarm circuits and automation systems.

Designed for three-phase 320–460 V AC line-to-line supplies, the ABB CM-PVE operates directly from the monitored circuit without requiring a separate auxiliary power supply. This specific version is designed for three-phase monitoring without a neutral connection, making it suitable for three-wire industrial power systems. Its compact 22.5 mm housing width and DIN rail mounting allow convenient integration into electrical control cabinets.

Key Advantages

• Reliable three-phase monitoring relay for industrial electrical systems.
• Integrated phase failure detection helps identify missing supply phases.
• Overvoltage monitoring detects excessively high supply voltage conditions.
• Undervoltage monitoring detects excessively low supply voltage conditions.
• 320–460 V AC line-to-line measuring range supports common industrial three-phase supplies.
• No neutral connection required for this three-phase monitoring version.
• Self-powered operation eliminates the need for a separate auxiliary supply.
• One normally open (SPST-NO) output contact supports compatible control and alarm circuits.
• 250 V AC / 4 A contact rating for appropriately rated control loads.
• Closed-circuit operating principle provides a defined output response to monitored faults.
• 500 ms start-up and tripping delays provide predictable monitoring behaviour.
• Fixed monitoring thresholds eliminate the need for complex voltage threshold adjustment.
• Integrated LED status indication provides convenient visual monitoring.
• Compact 22.5 mm DIN rail-mounted housing saves space in industrial control panels.
• Helps reduce equipment downtime caused by abnormal three-phase supply conditions.

Key Features

• ABB CM-PVE three-phase monitoring relay series.
• Combined phase failure, overvoltage and undervoltage monitoring.
• Three-phase 320–460 V AC rated supply voltage.
• 320–460 V AC line-to-line measuring range.
• 50/60 Hz supply frequency.
• Three-phase monitoring through L1, L2 and L3 connections.
• Neutral monitoring not included in order code 1SVR550871R9500.
• Powered directly by the monitored three-phase supply.
• One normally open relay output contact.
• Closed-circuit operating principle.
• Fixed overvoltage and undervoltage monitoring thresholds.
• 500 ms start-up delay.
• 500 ms tripping delay.
• Integrated LED operating status indication.
• Screw-terminal electrical connections.
• DIN rail mounting for industrial control cabinets.
• IP20 terminal protection for installation within suitable electrical enclosures.
• Compact housing dimensions of 78 × 22.5 × 78.5 mm.
• Suitable for integration with industrial motor starters and automation equipment.

Technical Specifications

• Manufacturer: ABB
• Series: CM-PVE Three-Phase Monitoring Relays
• Model: CM-PVE
• ABB order code: 1SVR550871R9500
• ABB product group: 310921-Measuring & Monitoring Relays
• Product type: Three-phase voltage monitoring relay
• Monitoring functions: Phase failure, overvoltage and undervoltage
• Rated control supply voltage: 3 × 320–460 V AC
• Measuring voltage range: 320–460 V AC (line-to-line)
• Supply frequency: 50/60 Hz
• Supply type: Alternating current (AC)
• Monitored phases: L1, L2 and L3
• Neutral monitoring: No
• Auxiliary power supply: Not required; powered by measuring circuit
• Output contacts: 1 normally open contact
• Contact configuration: SPST-NO (1 n/o)
• Output contact rating: 250 V AC / 4 A
• Operating principle: Closed-circuit principle
• Overvoltage threshold: Fixed
• Undervoltage threshold: Fixed
• Start-up delay: 500 ms
• Tripping delay: 500 ms
• Status indication: 1 LED
• Operating temperature: -20 to +60 °C
• Terminal protection rating: IP20
• Terminal type: Screw terminals
• Mounting type: DIN rail mounting
• Dimensions (H × W × D): 78 × 22.5 × 78.5 mm
• Net weight: 0.066 kg
• EAN: 4013614348112
• RoHS compliance: Following EU Directive 2011/65/EU

Reliable Three-Phase Voltage Monitoring for Industrial Motor Protection

Industrial motors and automated electrical systems depend on stable three-phase power supplies for reliable operation. Excessive voltage can place additional stress on motor insulation and electrical components, while insufficient voltage can reduce motor torque, increase current demand and cause unreliable machinery operation. A missing phase may also result in abnormal motor operation and overheating. The ABB CM-PVE phase and voltage monitoring relay helps identify these supply conditions before they cause prolonged equipment disruption.

The CM-PVE monitors the three-phase supply through its L1, L2 and L3 measuring connections. When the monitored supply satisfies the relay's operating conditions, its normally open output contact closes according to the closed-circuit principle. If a detectable phase failure, overvoltage or undervoltage condition occurs, the output contact opens, allowing the connected control circuit to initiate a protective response.

The relay uses fixed monitoring thresholds, making it particularly suitable for applications where straightforward installation and dependable supply supervision are priorities. Its 500 ms start-up and tripping delays provide defined response times, while the integrated LED offers a convenient indication of the relay's operating state.

Unlike the CM-PVE variant designed for neutral monitoring, ABB order code 1SVR550871R9500 is specifically intended for three-phase line-to-line monitoring without neutral supervision. It is therefore appropriate for compatible three-wire industrial supplies. It should not be selected where dedicated phase-to-neutral or single-phase monitoring is required.

The relay can be integrated into industrial motor starter circuits, electrical distribution panels and automated machinery. Its output contact is intended for compatible control and signalling circuits rather than direct interruption of a motor's main power supply. Where motor disconnection is required, the CM-PVE should operate an appropriately rated contactor or other suitable protective switching device.

Typical Applications

• Three-phase industrial power supply monitoring.
• Phase failure detection in motor control circuits.
• Overvoltage and undervoltage supervision for industrial equipment.
• Industrial motor starters and contactor control panels.
• Pumps and industrial pumping installations.
• Fans, blowers and ventilation equipment.
• Industrial compressors and refrigeration machinery.
• Conveyor systems and material handling equipment.
• Electrical distribution boards and industrial switchgear.
• Packaging machinery and automated manufacturing systems.
• OEM equipment requiring three-phase voltage monitoring without neutral supervision.