Why Choose the ABB CM-MPS.23S Three-Phase Monitoring Relay?
The ABB CM-MPS.23S (1SVR730885R4300) is a multifunctional three-phase monitoring relay designed to supervise electrical supply conditions in industrial power distribution, machinery and automation systems. Part of ABB's CM-MPS monitoring relay range, it combines several essential electrical monitoring functions in one compact device, helping identify supply faults before they cause unnecessary equipment downtime.
The CM-MPS.23S monitors phase failure, phase sequence, overvoltage, undervoltage, phase unbalance and interrupted neutral conditions. It also supports configurable automatic phase sequence correction and can be used for suitable single-phase monitoring applications. Its True RMS (TRMS) measuring principle provides dependable voltage supervision across supported AC supply conditions.
Designed for three-phase, four-wire systems with a phase-to-neutral voltage of 180–280 V AC, the relay is powered directly by the monitored circuit. It features two changeover (SPDT) output contacts, configurable output behaviour, adjustable voltage thresholds and an adjustable tripping delay of 0 s or 0.1–30 s. Its compact 22.5 mm DIN rail housing makes it suitable for installation in industrial electrical control panels and distribution cabinets.
Key Advantages
- Multifunctional three-phase monitoring in one compact industrial relay.
- Detects phase failure, incorrect phase sequence and phase unbalance.
- Provides overvoltage and undervoltage monitoring with adjustable thresholds.
- Includes interrupted neutral monitoring for compatible three-phase systems.
- 180–280 V AC phase-to-neutral measuring and supply range.
- True RMS measurement for dependable AC voltage supervision.
- Configurable automatic phase sequence correction for suitable control applications.
- Selectable phase sequence monitoring function.
- Adjustable tripping delay: 0 s or 0.1–30 s.
- Selectable ON-delay or OFF-delay operating behaviour.
- Two changeover (SPDT) contacts rated at 250 V / 4 A.
- Configurable output arrangement for common or separate monitoring signals.
- Powered directly by the monitored electrical supply.
- Supports mains frequencies from 45–440 Hz.
- Compact 22.5 mm DIN rail housing conserves control cabinet space.
- Three LED indicators simplify operating status and fault identification.
- Screw terminals with double-chamber cage connections support secure installation.
Key Features
- ABB CM-MPS.23S multifunctional three-phase monitoring relay.
- Manufacturer part number: 1SVR730885R4300.
- Rated control supply and measuring voltage: 3 × 180–280 V AC, phase-to-neutral.
- Connection arrangement: L1, L2, L3 and N.
- Monitoring functions: Phase failure, phase sequence, overvoltage, undervoltage, phase unbalance and interrupted neutral.
- Configurable automatic phase sequence correction.
- Phase sequence monitoring can be enabled or disabled.
- True RMS measuring principle.
- Supported mains frequency: 45–440 Hz.
- Adjustable overvoltage, undervoltage and phase unbalance thresholds.
- Tripping delay: 0 s or 0.1–30 s.
- Selectable ON-delayed or OFF-delayed tripping behaviour.
- Start-up delay: 200 ms.
- Output contacts: 2 changeover (SPDT) contacts.
- Configurable as 1 × 2 changeover contacts for a common signal or 2 × 1 changeover contacts for separate signals.
- Contact rating: 250 V / 4 A.
- Three LED indicators for operating and relay status.
- Front-mounted adjustment controls for configuration.
- Screw terminal connection technology.
- 22.5 mm housing width for compact installation.
- DIN rail mounting and removal without tools.
- Flame-retardant housing material classified UL 94 V-0.
- Optional sealable transparent cover to help prevent unauthorised adjustment.
Technical Specifications
- Manufacturer: ABB
- Series: CM-MPS Three-Phase Monitoring Relays
- Model: CM-MPS.23S
- ABB order code: 1SVR730885R4300
- ABB product group: 310921-Measuring & Monitoring Relays
- Product type: Multifunctional three-phase monitoring relay
- Rated control supply voltage: 3 × 180–280 V AC, phase-to-neutral
- Measuring voltage: 180–280 V AC, phase-to-neutral
- Supply arrangement: L1-L2-L3-N
- Rated mains frequency range: 45–440 Hz
- Measuring principle: True RMS (TRMS)
- Phase failure monitoring: Yes
- Phase sequence monitoring: Configurable
- Automatic phase sequence correction: Configurable
- Overvoltage monitoring: Yes
- Undervoltage monitoring: Yes
- Phase unbalance monitoring: Yes
- Interrupted neutral monitoring: Yes
- Single-phase mains monitoring: Supported for suitable applications
- Threshold adjustment: Adjustable overvoltage, undervoltage and phase unbalance thresholds
- Start-up delay: 200 ms
- Tripping delay: 0 s or adjustable 0.1–30 s
- Delay configuration: ON-delayed or OFF-delayed
- Output contacts: 2 changeover (SPDT) contacts
- Output configuration: 1 × 2 c/o or 2 × 1 c/o
- Contact rating: 250 V / 4 A
- UL/CSA contact rating: B300
- Maximum output operating voltage (UL/CSA): 300 V AC
- Status indication: 3 LEDs
- Terminal type: Screw terminals with double-chamber cage connections
- Terminal tightening torque: 0.8 N·m
- Mounting type: DIN rail mounting
- Housing flammability classification: UL 94 V-0
- Operating ambient temperature: −25 to +60 °C
- Storage temperature: −40 to +85 °C
- Dimensions (H × W × D): 85.6 × 22.5 × 103.7 mm
- Net weight: 0.149 kg
- EAN: 4016779851909
- Customs tariff number: 85364900
Comprehensive Three-Phase Power Monitoring and Equipment Protection
The ABB CM-MPS.23S continuously supervises the condition of a three-phase electrical supply and identifies abnormalities that could disrupt industrial equipment. Its monitoring functions include phase failure, phase sequence, voltage limits, phase unbalance and interrupted neutral detection, making it suitable for applications where reliable three-phase power is essential.
Phase failure monitoring helps identify the loss of a supply phase, while phase sequence monitoring detects an incorrect phase rotation. These functions are particularly useful in machinery and motor control applications where abnormal supply conditions can lead to incorrect operation, excessive stress or unexpected process interruptions.
The relay also provides adjustable overvoltage and undervoltage monitoring to identify electrical supply conditions outside the selected operating limits. Its phase unbalance monitoring detects differences between phase voltages, while interrupted neutral monitoring adds supervision for compatible four-wire electrical systems.
Using a True RMS measuring principle, the CM-MPS.23S evaluates the monitored AC supply and compares measured conditions with the configured thresholds. Engineers can adjust the monitoring parameters to suit the installation and configure the tripping delay to provide either immediate switching or a delayed response of up to 30 s.
The relay supports selectable ON-delayed and OFF-delayed tripping behaviour, allowing the timing of its output response to be adapted to the control application. Its configurable output arrangement provides either a common switching signal or separate signals for selected monitoring conditions, helping simplify integration with PLCs, alarms and contactor control circuits.
The automatic phase sequence correction function can also be configured for suitable control arrangements. This functionality provides a control signal arrangement for correcting phase sequence through appropriately designed external switching equipment; the monitoring relay does not physically interchange the supply phases by itself.
With its compact DIN rail design, front-mounted controls and three LED status indicators, the CM-MPS.23S provides a flexible solution for three-phase electrical supply supervision, industrial fault signalling and equipment protection.
Typical Applications
- Three-phase electrical supply monitoring in industrial installations.
- Phase failure detection for machinery and motor control circuits.
- Phase sequence supervision in equipment sensitive to phase rotation.
- Overvoltage and undervoltage monitoring in industrial power systems.
- Phase unbalance detection in three-phase distribution networks.
- Interrupted neutral monitoring in compatible four-wire systems.
- Industrial motor control centres and electrical distribution panels.
- Pumps, fans, compressors and conveyor control systems.
- Manufacturing and process automation equipment.
- PLC-based electrical fault monitoring and alarm signalling.
- Automatic transfer and supply supervision control applications.
- OEM machinery requiring multifunctional three-phase monitoring.
- Industrial maintenance and electrical condition monitoring.
- Control cabinets requiring compact DIN rail monitoring devices.
