Why Choose the ABB CM-MPN.72S Three-Phase Monitoring Relay?
The ABB CM-MPN.72S, order code 1SVR750489R8300, is a multifunctional three-phase monitoring relay designed for supervision of high-voltage three-phase electrical systems. It monitors phase failure, phase sequence, overvoltage, undervoltage and phase unbalance, helping protect motors, machinery and industrial automation equipment against abnormal supply conditions.
The CM-MPN.72S operates directly from the monitored circuit with a 3 × 530–820 V AC line-to-line rated control supply and measuring voltage at 50/60 Hz. Adjustable threshold values enable the monitoring response to be matched to the installation, while selectable phase sequence monitoring and automatic phase sequence correction provide additional flexibility for three-phase applications.
With two configurable changeover (SPDT) output contacts rated at 250 V / 4 A, a 200 ms start-up delay and selectable instantaneous or 0.1–30 s tripping delay, the CM-MPN.72S provides flexible signalling and control. Screw terminals with double-chamber cage connections and a compact 45 mm DIN-rail housing support secure installation in industrial control panels.
Key Advantages
- Multifunctional three-phase voltage and phase monitoring.
- Wide 3 × 530–820 V AC line-to-line measuring and supply range.
- Detects phase failure and phase unbalance.
- Provides adjustable overvoltage and undervoltage monitoring.
- Selectable phase sequence monitoring helps identify incorrect phase rotation.
- Supports automatic phase sequence correction.
- Adjustable monitoring thresholds allow application-specific configuration.
- Selectable instantaneous or 0.1–30 s tripping delay.
- Dual changeover outputs can provide common or separate signalling.
- Robust screw terminal connection technology provides secure industrial wiring.
Key Features
- ABB CM-MPN multifunctional three-phase monitoring relay.
- 530–820 V AC line-to-line measuring range.
- Powered directly from the measuring circuit.
- 50/60 Hz rated frequency.
- TRMS measuring principle.
- Phase failure detection.
- Selectable phase sequence monitoring.
- Automatic phase sequence correction.
- Overvoltage and undervoltage monitoring.
- Phase unbalance detection.
- Adjustable monitoring thresholds.
- 200 ms start-up delay.
- Selectable ON- or OFF-delay operation.
- Tripping delay of 0 or 0.1–30 s.
- 2 × 1 c/o or 1 × 2 c/o (SPDT) contacts, configurable.
- Output contacts rated at 250 V / 4 A.
- Screw terminals with double-chamber cage connections.
- DIN-rail mounting.
Reliable Monitoring of High-Voltage Three-Phase Systems
Three-phase monitoring relays continuously supervise the incoming electrical supply and provide a switching response when monitored parameters move outside configured limits. The ABB CM-MPN.72S monitors phase presence, phase sequence, voltage levels and phase balance, helping protect industrial equipment from potentially damaging three-phase supply faults.
Its 530–820 V AC line-to-line range makes the CM-MPN.72S particularly suitable for higher-voltage industrial three-phase networks. Configurable output operation allows the contacts to provide either a common signal or separate overvoltage and undervoltage signals, while adjustable thresholds and timing functions allow the monitoring response to be matched to the application.
Typical Applications
- High-voltage three-phase motor protection.
- Industrial mains and power supply supervision.
- Phase failure and phase sequence detection.
- Overvoltage and undervoltage monitoring.
- Phase unbalance supervision.
- Pumps, compressors, fans and conveyors.
- Industrial machinery and process equipment.
- Electrical control panels and switchboards.
