1SVR740884R4300 ABB CM-MPS.43P Three-Phase Monitoring Relay 300-500 V AC

Why Choose the ABB CM-MPS.43P Three-Phase Monitoring Relay?

The ABB CM-MPS.43P, order code 1SVR740884R4300, is a multifunctional three-phase monitoring relay designed to supervise critical electrical parameters in industrial three-phase power systems. As part of the ABB CM-MPS three-phase monitoring relay series, it monitors phase sequence, phase failure, overvoltage, undervoltage and phase unbalance to help protect motors, machinery and electrical equipment against abnormal supply conditions.

The CM-MPS.43P is powered directly from the measuring circuit and operates with a 3 × 300–500 V AC rated control supply and measuring voltage. Its TRMS measuring principle supports reliable voltage supervision, while adjustable threshold values allow the monitoring response to be matched to the installation. Phase sequence monitoring can be switched off, and automatic phase sequence correction can be configured where required.

With two changeover (SPDT) output contacts rated at 250 V / 4 A, configurable common or separate signalling and an adjustable tripping delay of 0 or 0.1–30 s, the CM-MPS.43P provides flexible integration with industrial control systems. ABB Easy Connect push-in terminals and a compact 22.5 mm DIN-rail housing simplify installation and maintenance.

Key Advantages

• Multifunctional three-phase voltage and phase monitoring.
• 3 × 300–500 V AC rated control supply and measuring voltage.
• Monitors overvoltage, undervoltage, phase failure and phase unbalance.
• Selectable phase sequence monitoring for additional protection against incorrect phase rotation.
• Configurable automatic phase sequence correction.
• TRMS measuring principle provides dependable voltage supervision.
• Suitable for mains frequencies from 45–440 Hz.
• Adjustable 0 or 0.1–30 s tripping delay accommodates temporary supply variations.
• Configurable dual changeover outputs support common or separate signalling.
• Maintenance-free Easy Connect push-in terminals simplify panel wiring.

Key Features

• ABB CM-MPS.43 multifunctional three-phase monitoring relay.
• 300–500 V AC line-to-line measuring range.
• Powered directly by the measuring circuit.
• TRMS measuring principle.
• Phase sequence monitoring, selectable on or off.
• Phase failure monitoring.
• Overvoltage and undervoltage monitoring.
• Phase unbalance monitoring.
• Configurable automatic phase sequence correction.
• Adjustable monitoring thresholds.
• Adjustable tripping delay of 0 or 0.1–30 s.
• 2 c/o (SPDT) output contacts.
• Outputs configurable as 1 × 2 c/o common signal or 2 × 1 c/o separate signals.
• Output contacts rated at 250 V / 4 A.
• 3 LED indicators for operating-state indication.
• ABB Easy Connect push-in terminal technology.
• Compact 22.5 mm-wide DIN-rail housing.

Reliable Three-Phase Power Monitoring for Industrial Systems

Three-phase monitoring relays continuously supervise incoming electrical supplies and provide a switching response when monitored parameters move outside configured limits. The ABB CM-MPS.43P monitors voltage levels, phase presence, phase sequence and phase balance, helping protect three-phase motors, machinery and automation equipment against potentially damaging supply conditions.

Its 300–500 V AC measuring range and 45–440 Hz frequency capability make the CM-MPS.43P suitable for a broad range of three-phase systems. Configurable output operation allows both relay contacts to provide a common signal or to provide separate signalling for overvoltage and undervoltage thresholds, supporting flexible integration into alarms, contactor circuits and automation systems.

Typical Applications

• Three-phase motor and machinery protection.
• Industrial power supply supervision.
• Phase failure and phase sequence detection.
• Overvoltage and undervoltage monitoring.
• Phase unbalance supervision.
• Pumps, compressors, fans and conveyors.
• Industrial automation and process equipment.
• Electrical control panels and switchboards.