Why Choose the ABB CM-PVS.81S Three-Phase Monitoring Relay?
The ABB CM-PVS.81S 1SVR730794R2300 is a compact three-phase monitoring relay designed to supervise important supply conditions in industrial three-phase systems. It monitors phase failure, phase sequence, overvoltage and undervoltage, enabling control systems to respond when the incoming supply moves outside the required operating conditions.
The CM-PVS.81S operates directly from its monitored 3 × 200–400 V AC line-to-line supply, eliminating the need for a separate auxiliary supply. It uses a TRMS measuring principle, provides adjustable absolute overvoltage and undervoltage thresholds, and allows phase-sequence monitoring to be switched off when it is not required.
Two changeover (SPDT) output contacts rated at 250 V / 4 A provide signalling and control capability. A fixed 200 ms start-up delay is complemented by an adjustable tripping delay from instantaneous operation to 30 s, with selectable ON- or OFF-delayed response, while screw terminals and a slim 22.5 mm housing support straightforward DIN-rail installation.
Key Advantages
- Combines phase failure, phase sequence, overvoltage and undervoltage monitoring in one device.
- Designed for 3 × 200–400 V AC line-to-line three-phase systems.
- TRMS measuring principle provides reliable voltage evaluation.
- Adjustable absolute overvoltage and undervoltage threshold values.
- Phase-sequence monitoring can be switched off when not required.
- Powered directly from the monitored circuit, avoiding a separate auxiliary supply.
- 2 c/o (SPDT) contacts provide flexible alarm and control outputs.
- Selectable instantaneous or 0.1–30 s tripping delay.
- Selectable ON- or OFF-delayed tripping response.
- Compact 22.5 mm DIN-rail housing conserves panel space.
Key Features
- ABB CM-PVS.81S three-phase monitoring relay.
- 3 × 200–400 V AC rated control supply and measuring voltage.
- 50/60 Hz rated 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) output contacts.
- Output contacts rated at 250 V / 4 A.
- 3 LEDs for indication of operational states.
- Screw terminals with double-chamber cage connection technology.
Comprehensive Three-Phase Supply Monitoring
The ABB CM-PVS.81S continuously supervises a 3 × 200–400 V AC three-phase supply for voltage and phase abnormalities. Adjustable overvoltage and undervoltage thresholds define the acceptable operating window, while phase-failure detection and selectable phase-sequence monitoring help identify supply conditions that could interrupt operation or adversely affect connected three-phase equipment.
Its TRMS measuring principle provides dependable voltage evaluation, while the adjustable tripping delay can prevent short-duration disturbances from causing an unwanted response. With selectable ON- or OFF-delayed operation and two changeover contacts, the CM-PVS.81S can be integrated into alarm circuits, contactor controls, machine interlocks 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 equipment.
- Industrial machinery and process automation.
- Electrical control and distribution panels.
