Type 1 Circuit Protection: How do I achieve Type 1 protection of a soft starter? 

Type 1 protection requires that, in the event of a short circuit on the output of a soft starter, the fault must be cleared without risk of injury to personnel. There is no requirement that the soft starter must remain operational after the fault.

Type 1 protection is provided by HRC fuses or a MCCB that form part of the motor branch circuit.

As a minimum, the protection method must be able to sustain the required motor start current.

Maximum fuse ratings for Type 1 motor protection are specified in UL and IEC standards.