Why Choose the ABB CM-PVS.31S Three-Phase Monitoring Relay?
The ABB CM-PVS.31S 1SVR730794R1300 is a compact three-phase monitoring relay designed to supervise critical parameters in three-phase AC supplies. It monitors phase failure, phase sequence, overvoltage and undervoltage, helping industrial control systems detect abnormal mains conditions before they affect connected machinery or processes.
The CM-PVS.31S is powered directly by the measuring circuit and is designed for 3 × 160–300 V AC line-to-line systems. Adjustable absolute overvoltage and undervoltage thresholds allow the monitoring limits to be matched to the installation, while phase-sequence monitoring can be enabled or disabled according to application requirements.
The relay provides two changeover (SPDT) output contacts rated at 250 V / 4 A. A fixed 200 ms start-up delay and selectable instantaneous or 0.1–30 s tripping delay help accommodate transient conditions, while selectable ON- or OFF-delay operation, three status LEDs and screw terminals provide flexible integration into industrial control panels.
Key Advantages
- Combines phase failure, phase sequence, overvoltage and undervoltage monitoring in one relay.
- Designed for three-phase systems from 160–300 V AC line-to-line.
- TRMS measuring principle provides dependable voltage evaluation.
- Adjustable absolute overvoltage and undervoltage thresholds.
- Phase-sequence monitoring can be switched off when not required.
- Powered directly from the monitored three-phase circuit.
- 2 c/o (SPDT) output contacts provide flexible signalling and control.
- Selectable instantaneous or 0.1–30 s tripping delay.
- Selectable ON- or OFF-delayed tripping response.
- Compact 22.5 mm width conserves DIN-rail space.
Key Features
- ABB CM-PVS.31S three-phase monitoring relay.
- 3 × 160–300 V AC rated control supply and measuring voltage.
- 50/60 Hz supply frequency.
- Phase failure detection.
- Selectable phase-sequence monitoring.
- Adjustable overvoltage monitoring.
- Adjustable undervoltage monitoring.
- TRMS measuring principle.
- 200 ms start-up delay.
- Tripping delay selectable between 0 s and 0.1–30 s.
- Selectable ON- or OFF-delay tripping function.
- 2 changeover (SPDT) contacts.
- Output contacts rated at 250 V / 4 A.
- 3 LEDs for operating-state indication.
- Screw terminals with double-chamber cage connection technology.
Comprehensive Three-Phase Supply Monitoring
The ABB CM-PVS.31S continuously evaluates a 160–300 V AC three-phase supply for voltage and phase conditions. Adjustable overvoltage and undervoltage thresholds allow acceptable operating limits to be defined for the installation, while phase-failure detection and selectable phase-sequence supervision help identify supply faults that could disrupt or damage three-phase equipment.
The TRMS measuring principle supports reliable voltage evaluation, while the adjustable tripping delay allows short-duration disturbances to be tolerated when appropriate. With the option of ON- or OFF-delayed operation and two changeover contacts, the CM-PVS.31S can be integrated into alarm circuits, contactor control, machine interlocking and other protective control functions.
Typical Applications
- Three-phase mains voltage supervision.
- Phase failure detection.
- Phase-sequence monitoring.
- Overvoltage and undervoltage supervision.
- Three-phase motor and pump control systems.
- Compressors, fans and material handling machinery.
- Industrial automation and process equipment.
- Electrical control and distribution panels.
