Mccb

The MCCB comes into its own at feeder fault, allowing additional service to the rest of the system without interruption. The criteria used for selecting MCCBs include fault level at the point of installation, continuous load current, and the type of downstream equipment. Frame size is chosen based on either the motor rating or connecting load and the breaking capacity is sized to match available short circuit current, thereby allowing the MCCB to clear the ground fault without damaging contacts.

We have experience with Schneider and ABB MCCBs used in PCC panels, MCC panels, distribution boards and dedicated feeders. When selecting settings for adjustable thermal and magnetic MCCBs, these are based on cable size and co-ordination with the upstream ACB. For capacitor banks and high inrush loads, settings are set to avoid unnecessary nuisance tripping upon energization. The layout for terminal spreader, phase barrier and proper busbar connections are considered to reduce heat at the termination of the circuit.

By virtue of how the mounting arrangements are designed, there will be sufficient bending space for incoming and outgoing cables due to the fact that you cannot jam large aluminium or copper lugs into any corner. Each MCCB will complete mechanical operation tests, insulation resistance tests, and setting verifications prior to their incorporation in an MCC panel.

When used in US facilities, MCCBs are used to handle load variations that occur repeatedly, isolate faulted distribution feeders within an established time, and ensure selectivity in a power distribution system.