NOARK Molded Case Motor Circuit Protectors

NOARK Electric offers a complete range of 3 pole Molded Case Motor Circuit Protectors (MCPs, magnetic only) which are used to protect the three-phase asynchronous motors in six frame sizes: M1M – 150 A, M2M – 250 A, M3M – 400 A, M4M – 600 A, M5M – 800 A, and M6M – 1,200 A.

Each frame size offers a range of interrupting voltage ratings from 240-690 Vac.

This series MCP conforms to global standards that include UL 489, CSA C22.2 No 5 and IEC 60947-2.

The traditional system used for this purpose is based on three different devices: a circuit breaker for protection against short circuits, a thermal relay for protection against overload and phase loss or unbalance of phase, and a contactor for motor switching.

In particular, when selecting these devices, different factors must be taken into consideration, such as:

• The rated motor power
• The type of motor: with cage rotor or with wound rotor
• The fault current at the point of the network where the motor is installed