Three Phase Monitor Relays

The highly sophisticated CM-S/N range in ABB’s new S-line housing offers two different types of connection terminals and is ideally suited for universal use. Double-chamber cage connection terminals make it possible to connect fires up to 2 x 2.5 mm2 (2 x 14 AWG), rigid or fine-strand, with or without ferrules. Potential distribution does not require additional terminals. Easy connect technology Innovative push-in connection terminals for tool-free installation. The connection is gas-proof and has the same direction as the double-chamber cage connection terminals.

Only reliable and continuous monitoring of a three-phase network guarantees the trouble-free and economic operation of machines and installations. Thus the important parameters of three-phase systems are:

    • Phase voltages
    • Phase sequence
    • Phase unbalance
    • Phase loss
    • Frequency

Depending on the device additional features and functions are available, as:
    • Automatic phase sequence correction
    • Neutral Monitoring
    • Open or closed circuit operation principle
    • Latching function
    • Start up delay
    • Tripping delay
    • Restart delay

The most multifunctional devices in the EPR assortment are the CM-MPS/N monitoring relays for rated voltage levels up to 820 V AC and 400 Hz. Additionally a variety of economic and cost-efficient three-phase monitoring relays are offered in this range with specialized functionality.

CM-MPx
Phase sequence, phase loss, unbalance and over- and undervoltage monitoring with or without neutral monitoring

CM-PBx
Phase loss with or without neutral monitoring

CM-PSx
Phase sequence, phase loss and over- and undervoltage monitoring

CM-PAx
Phase sequence, phase loss and unbalance monitoring

CM-PFx
Phase sequence, phase loss monitoring

CM-PVx
Depending on the device: Over- and undervoltage monitoring with or without interrupted neutral monitoring or phase sequence, phase loss and over- and under voltage monitoring

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