Why Choose the ABB CM-MPS.43S Three-Phase Monitoring Relay?
The ABB CM-MPS.43S is a multifunctional three-phase monitoring relay designed for comprehensive supervision of industrial three-phase supplies. With ABB order code 1SVR730884R4300, it is powered directly from the measuring circuit and operates across a 300–500 V AC line-to-line range.
The CM-MPS.43S monitors phase failure, phase sequence, overvoltage, undervoltage and phase unbalance. In addition, it provides automatic phase sequence correction, allowing connected three-phase equipment to maintain the correct phase sequence when the incoming phases are reversed. Adjustable threshold values enable the monitoring response to be matched to the application.
The relay provides configurable outputs that can operate as 1 × 2 c/o (SPDT) contacts for a common signal or 2 × 1 c/o (SPDT) contacts for separate overvoltage and undervoltage signalling. A 200 ms start-up delay and selectable ON- or OFF-delay of 0 or 0.1–30 s, combined with screw terminals and a compact 22.5 mm DIN-rail housing, provide flexible integration into industrial control systems.
Key Advantages
- Multifunctional monitoring of critical three-phase supply parameters.
- Monitors phase failure, phase sequence, overvoltage, undervoltage and phase unbalance.
- Automatic phase sequence correction for applications requiring correct phase rotation.
- Direct monitoring across a 300–500 V AC line-to-line range.
- Adjustable voltage and phase-unbalance thresholds for application-specific monitoring.
- Selectable ON- or OFF-delay with adjustable tripping time.
- Configurable output arrangement for common or separate fault signalling.
- Compact 22.5 mm-wide housing conserves DIN-rail space.
Key Features
- ABB CM-MPS multifunctional three-phase monitoring relay series.
- 300–500 V AC line-to-line rated control supply and measuring voltage.
- Powered directly by the monitored measuring circuit.
- Phase failure detection.
- Phase sequence monitoring.
- Automatic phase sequence correction.
- Adjustable overvoltage and undervoltage monitoring.
- Adjustable phase unbalance monitoring.
- 200 ms start-up delay.
- 0 or 0.1–30 s selectable ON- or OFF-delay.
- Configurable 1 × 2 c/o or 2 × 1 c/o (SPDT) contacts.
- Screw connection technology with double-chamber cage terminals.
Comprehensive Three-Phase Monitoring with Automatic Phase Sequence Correction
Three-phase motors, pumps, compressors and machinery can be affected by loss of a phase, incorrect phase rotation, abnormal voltage or excessive phase unbalance. The ABB CM-MPS.43S combines these monitoring functions in one compact device and adds automatic phase sequence correction for applications where maintaining the correct rotation sequence is important.
Its configurable relay outputs provide additional flexibility. They can operate together as a common monitoring signal or separately for overvoltage and undervoltage thresholds, while the adjustable 0 or 0.1–30 s tripping delay helps distinguish sustained faults from temporary supply variations.
Typical Applications
- Three-phase motor and machinery control systems.
- Applications requiring automatic phase sequence correction.
- Pumps, fans and compressor systems.
- Industrial control and automation panels.
- Phase failure and phase sequence supervision.
- Overvoltage and undervoltage monitoring.
- Phase unbalance detection.
- Industrial power distribution and OEM machinery.
