Why Choose the ABB CM-MPS.41S Three-Phase Monitoring Relay?
The ABB CM-MPS.41S is a multifunctional three-phase monitoring relay designed to supervise critical electrical parameters in industrial three-phase systems. With ABB order code 1SVR730884R3300, it operates directly from the monitored network across a 300–500 V AC line-to-line range at 50/60 Hz.
The CM-MPS.41S monitors phase failure, phase sequence, overvoltage, undervoltage and phase unbalance. Adjustable threshold values allow the voltage and unbalance monitoring response to be matched to the installation, while selectable phase-sequence monitoring provides additional flexibility for machinery and distribution applications.
A 200 ms start-up delay and selectable ON- or OFF-delay with an adjustable tripping time of 0 or 0.1–30 s help distinguish persistent faults from temporary supply variations. Two changeover (SPDT) output contacts rated at 250 V / 4 A, screw terminals and a compact 22.5 mm DIN-rail housing provide straightforward integration into industrial control systems.
Key Advantages
- Multifunctional supervision of critical three-phase supply conditions.
- Monitors phase failure, phase sequence, overvoltage, undervoltage and phase unbalance.
- Direct monitoring across a 300–500 V AC line-to-line range.
- Adjustable voltage and phase-unbalance thresholds for application-specific protection.
- Selectable ON- or OFF-delay with adjustable tripping time.
- Two changeover output contacts provide flexible signalling and control.
- Compact 22.5 mm-wide housing conserves DIN-rail space.
- Screw connection technology provides secure industrial field wiring.
Key Features
- ABB CM-MPS multifunctional three-phase monitoring relay series.
- 300–500 V AC line-to-line rated control supply and measuring voltage.
- 50/60 Hz rated supply frequency.
- Phase failure detection.
- Selectable phase sequence monitoring.
- Adjustable overvoltage and undervoltage monitoring.
- Adjustable phase unbalance monitoring.
- 200 ms start-up delay.
- Selectable ON- or OFF-delay.
- 0 or 0.1–30 s adjustable tripping delay.
- 2 c/o (SPDT) relay outputs.
- Screw connection technology with double-chamber cage terminals.
Comprehensive Three-Phase Supply Monitoring
Three-phase machinery and electrical systems can be affected by abnormal voltage, loss of a phase, incorrect phase rotation or excessive phase unbalance. The ABB CM-MPS.41S combines these monitoring functions in one compact device, allowing the control system to respond when the monitored supply moves outside the configured operating limits.
Adjustable thresholds and a selectable tripping delay allow the relay response to be tailored to the installation. The 200 ms start-up delay supports stable operation during initial energisation, while the selectable ON- or OFF-delay can help prevent temporary supply variations from causing unnecessary switching.
Typical Applications
- Three-phase motor and machinery protection circuits.
- Industrial control and automation panels.
- Phase failure and phase sequence supervision.
- Overvoltage and undervoltage monitoring.
- Phase unbalance detection.
- Pumps, fans and compressor control systems.
- Conveyors and material handling equipment.
- Industrial power distribution and OEM machinery.
