Why Choose the ABB CM-PFE Phase Failure and Sequence Monitoring Relay?
The ABB CM-PFE (1SVR550824R9100) is a compact and reliable three-phase monitoring relay designed to detect phase failure and incorrect phase sequence in industrial AC electrical systems. As part of the ABB CM-PFE three-phase monitoring relay series, it provides essential supply supervision for three-phase motors, industrial machinery and automation equipment, helping prevent operational problems caused by missing phases or incorrect phase rotation.
This phase monitoring relay continuously evaluates the connected three-phase supply and operates according to the closed-circuit principle. When all three phases are present in the correct sequence, its output relay energises, allowing the connected control system to operate. If a phase failure or incorrect phase sequence is detected, the relay de-energises, enabling a connected contactor or control circuit to initiate protective action.
With a three-phase 208–440 V AC measuring and supply voltage range, a single change-over (SPDT) output contact and a compact 22.5 mm housing width, the ABB CM-PFE is ideal for industrial motor control panels, electrical distribution systems and automated machinery. Its self-powered design eliminates the need for a separate auxiliary supply, while DIN rail mounting enables straightforward installation inside electrical control cabinets.
Key Advantages
- Reliable three-phase monitoring relay designed for industrial electrical protection and automation.
- Integrated phase failure detection helps identify missing supply phases.
- Phase sequence monitoring detects incorrect phase rotation in three-phase systems.
- Three-phase 208–440 V AC operating range supports a wide range of industrial electrical supplies.
- Self-powered operation uses the monitored three-phase supply without requiring a separate auxiliary voltage.
- Integrated 1 change-over (SPDT) relay contact for signalling and control applications.
- 250 V AC / 4 A output contact rating for compatible control circuits.
- Closed-circuit operating principle enables the output relay to release when a monitored fault is detected.
- 500 ms start-up and tripping delays provide defined relay operating behaviour.
- Integrated yellow LED status indicator provides clear visual indication of relay operation.
- Compact 22.5 mm DIN rail-mounted design saves space in electrical control panels.
- Helps reduce unexpected machinery downtime and incorrect motor operation caused by phase supply faults.
Key Features
- ABB CM-PFE three-phase monitoring relay series.
- Phase failure and phase sequence monitoring.
- Three-phase 208–440 V AC rated control supply.
- 208–440 V AC line-to-line measuring range.
- 50/60 Hz operating frequency.
- Supply voltage obtained directly from the monitored three-phase circuit.
- 1 change-over (SPDT) output contact.
- 250 V AC / 4 A relay contact rating.
- Closed-circuit principle for phase monitoring operation.
- Output relay energises when all three phases are present in the correct sequence.
- Output relay de-energises when an incorrect phase sequence or detectable phase failure occurs.
- 500 ms start-up delay.
- 500 ms tripping delay.
- Integrated yellow LED for output relay status indication.
- Fixed monitoring thresholds for straightforward operation.
- Screw-terminal connections for electrical installation.
- IP20 protection rating for installation inside suitable electrical enclosures.
- DIN rail mounting for industrial control cabinets.
- Compact housing measuring 78 × 22.5 × 78.5 mm.
Technical Specifications
- Manufacturer: ABB
- Series: CM-PFE Three-Phase Monitoring Relays
- Model: CM-PFE
- ABB order code: 1SVR550824R9100
- ABB product group: 310921-Measuring & Monitoring Relays
- Product type: Three-phase monitoring relay
- Monitoring functions: Phase failure and phase sequence
- Rated control supply voltage: 3-phase 208–440 V AC
- Measuring voltage range: 208–440 V AC (line-to-line)
- Supply frequency: 50/60 Hz
- Supply type: Alternating current (AC)
- Monitored phases: 3-phase (L1, L2, L3)
- Auxiliary supply: Not required; powered by measuring circuit
- Output contacts: 1 change-over contact
- Contact configuration: SPDT (1 c/o)
- Output contact rating: 250 V AC / 4 A
- Output contact terminals: 11, 12, 14
- Operating principle: Closed-circuit principle
- Start-up delay: 500 ms
- Tripping delay: 500 ms
- Monitoring thresholds: Fixed
- Status indication: 1 yellow LED
- Operating temperature: -20 to +60 °C
- Protection rating: IP20
- Terminal type: Screw terminals
- Mounting type: DIN rail mounting
- Dimensions (H × W × D): 78 × 22.5 × 78.5 mm
- Net weight: Approx. 0.068 kg
- EAN: 4013614348044
- RoHS compliance: EU Directive 2011/65/EU
Reliable Three-Phase Monitoring for Industrial Motor Protection
Three-phase electrical systems depend on the correct phase sequence and the availability of all three supply phases for reliable operation. A missing phase can cause excessive current in the remaining motor windings, reduced torque and overheating, while an incorrect phase sequence can cause motors to rotate in the wrong direction. The ABB CM-PFE phase monitoring relay helps protect industrial equipment by supervising these critical supply conditions.
The CM-PFE monitors the three-phase supply through its L1, L2 and L3 measuring connections. When the supply is present within the specified operating range and the phase sequence is correct, the output relay energises and the yellow LED indicates its operating state. If the phase sequence becomes incorrect or a detectable phase failure occurs, the output relay releases and the LED switches off. This change of contact state can be used to interrupt a motor contactor control circuit or provide a fault signal to an automation system.
The relay operates according to the closed-circuit principle, with its output contact energised under healthy supply conditions. The integrated 500 ms start-up and tripping delays provide defined response timing, while fixed monitoring thresholds simplify installation and operation without the need for complex parameter configuration.
For motors that continue rotating after a phase is lost, residual or regenerated voltage may remain on the disconnected phase. The CM-PFE can detect phase failure where the reverse-fed voltage is below approximately 60% of the nominal voltage. Applications with higher reverse-fed voltages may require additional phase unbalance monitoring to ensure suitable protection.
The ABB CM-PFE is designed for integration into motor starter circuits, industrial control panels and electrical distribution equipment. Its compact DIN rail-mounted construction, screw-terminal connections and self-powered monitoring function make it a practical solution for machine builders and automation engineers requiring dependable phase sequence and phase failure supervision.
Typical Applications
- Three-phase electric motor supply monitoring.
- Industrial motor starters and contactor control circuits.
- Pumps and industrial pumping systems.
- Fans, blowers and ventilation equipment.
- Industrial compressors and refrigeration machinery.
- Conveyors and material handling equipment.
- Packaging and automated production machinery.
- Industrial electrical distribution boards and control panels.
- Phase sequence verification in three-phase electrical installations.
- OEM machinery requiring phase failure and incorrect phase rotation detection.
