1SVR740824R9300 ABB CM-PFS.P Three-Phase Monitoring Relay

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

The ABB CM-PFS.P is a compact three-phase monitoring relay designed to supervise three-phase mains for phase failure and incorrect phase sequence. Supplied under ABB order code 1SVR740824R9300, it provides straightforward supply monitoring for motors, machinery and industrial control systems where correct phase presence and rotation are essential.

The CM-PFS.P operates directly from the monitored circuit across a wide 3 × 200–500 V AC line-to-line measuring range at 50/60 Hz. Because the measuring voltage also provides the relay's control supply, no separate auxiliary supply is required, simplifying panel wiring and installation.

The relay operates according to the closed-circuit principle and provides 2 changeover (SPDT) output contacts. A 500 ms start-up delay, two LED status indicators, maintenance-free Easy Connect push-in terminals and a compact 22.5 mm DIN rail housing make the CM-PFS.P a practical solution for dependable three-phase supply supervision.

Key Advantages

• Monitors phase failure and incorrect phase sequence.
• Wide 3 × 200–500 V AC line-to-line measuring range.
• Suitable for 50/60 Hz three-phase supplies.
• Powered by the measuring circuit, eliminating the need for a separate auxiliary supply.
• Closed-circuit operating principle supports fail-safe monitoring behaviour.
• 2 changeover (SPDT) contacts provide flexible signalling and control.
• 500 ms start-up delay supports reliable monitoring after energisation.
• Two LEDs provide clear indication of operational states.
• Maintenance-free Easy Connect push-in terminals simplify wiring.
• Compact 22.5 mm width conserves DIN rail space.

Key Features

• ABB CM-PFS three-phase monitoring relay series.
• ABB order code 1SVR740824R9300.
• Phase failure detection.
• Phase sequence monitoring.
• 200–500 V AC line-to-line measuring range.
• 50/60 Hz rated frequency.
• Control supply voltage equal to the measuring voltage.
• 500 ms start-up delay.
• Closed-circuit principle.
• 2 c/o (SPDT) output contacts.
• Two LED indicators for operational states.
• Easy Connect push-in / screwless terminal technology.
• Tool-free mounting and removal from DIN rail.
• UL 94 V-0 housing material.
• Suitable for railway applications.

Reliable Phase Sequence and Phase Failure Monitoring

Correct phase sequence is essential for three-phase motors and other equipment where the direction of rotation matters, while loss of a phase can lead to improper operation or equipment damage. The ABB CM-PFS.P continuously monitors the three-phase supply and uses its output contacts to signal when the phase sequence is incorrect or a phase failure occurs.

With its wide 200–500 V AC measuring range and measuring-circuit-powered design, the CM-PFS.P can be integrated into a broad range of industrial three-phase systems without a separate control supply. Its closed-circuit principle, 500 ms start-up delay and dual changeover outputs provide a simple and dependable interface for contactors, alarms and control systems.

Typical Applications

• Three-phase motor protection circuits.
• Pumps, fans and ventilation systems.
• Compressors and refrigeration machinery.
• Conveyors and material handling systems.
• Industrial machinery and production equipment.
• Motor control centres and electrical control panels.
• Phase-sequence verification in three-phase installations.
• Applications requiring phase-failure supervision.