You will need to determine if you require a magnetic or thermal magnetic motor protection and take into consideration other factor's I.E load, Current, Voltage, Motor Starting (D.O.L or soft start)

Compact NSX motor circuit breakers are designed for motor-feeder solutions using:

i) three devices, including an MA or 1.3 M magnetic only trip unit.

ii) two devices including a TM-D or 2 M thermal magnetic trip unit. They are designed for use with contractors in the AC3 utilization category (80 % of all cases) and they ensure
type-2 coordination with the contractor.

For the AC 4 utilization category, the difficult conditions generally make it necessary to oversize the protection circuit breaker with respect to the AC 3 category.



Please see link to technical guide and refer to page 65 for the characteristics of the motor protection and page 259 onwards for the part number selection.

ComPacT NSX & NSXm Circuit Breakers and Switch Disconnectors from 16 to 630A up to 690V - May 2024 | Schneider Electric

Released for: Schneider Electric Ireland