Electrical relay ABB CM-PFS.S

The ABB CM-PFS.S is a compact three-phase monitoring relay designed to detect phase loss and incorrect phase sequence in three-phase systems. It operates with a rated control supply / three-phase measuring voltage of 200–500 V AC and provides a 2 C/O output with contacts rated at 250 V / 4 A. The relay has fixed threshold values, a screw connection with double-chamber cage terminals and compact dimensions of 22.5 x 103.7 x 85.6 mm, making it suitable for installation in control panels and distribution boards.

Advantages

The device offers reliable monitoring of phase loss and phase sequence with fixed threshold settings, reducing the need for on-site configuration. Its 2 C/O output contacts support switching of control circuits up to 250 V / 4 A. The compact form factor and screw double-chamber cage connection terminals provide secure wiring and straightforward mounting in standard DIN-rail enclosures. The product is identified by ABB part number 1SVR730824R9300 and EAN 4016779851947.

Suitable for

• Protection of three-phase motors and compressors against phase loss or phase reversal
• Monitoring of incoming three-phase supply in industrial or commercial panels
• Integration in control circuits where fixed threshold phase monitoring is required

Key specifications

• Rated control / measuring voltage: 200–500 V AC
• Output: 2 C/O (2 changeover contacts)
• Contact rating: 250 V / 4 A
• Monitored functions: phase loss and phase sequence (fixed thresholds)
• Connection: screw terminals with double-chamber cage
• Dimensions (W×H×D): 22.5 × 103.7 × 85.6 mm
• Weight: 127 g
• Manufacturer / MPN: ABB, 1SVR730824R9300
• EAN: 4016779851947

How to use

Mount the CM-PFS.S on a standard DIN rail inside the control cabinet and wire the three-phase supply to the designated measuring terminals following the wiring diagram in the product documentation. Connect the load or control circuit to the 2 C/O contacts, observing the maximum contact rating of 250 V / 4 A. After power-up the relay monitors phase presence and sequence automatically using its fixed threshold values; no user adjustment of thresholds is required.

Recommendations

Use the relay in installations where phase monitoring with fixed thresholds is acceptable. Ensure contactor or downstream devices do not exceed the contact ratings, and follow applicable electrical safety standards during installation and maintenance.