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Danfoss Drives · DKDD.PB.551.A1.02
Type 2 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 or damage to the soft starter.
Type 2 protection is provided by semiconductor fuses, which must
be able to carry motor start current and have a total clearing I2t
less than the I
2
t of the soft starter SCRs.
Semiconductor fuses for Type 2 circuit protection are additional
to HRC fuses or MCCBs that form part of the motor branch circuit
protection.
Refer to the soft starter’s Design Guide for semiconductor fuse
recommendations.
Short Circuit Protection: What is required for Type 2
short circuit protection of a soft starter?
