■B curve: provides control ad protection against over current for every long cables, magnetic trip unit operates between 3 and 5 times ampere rating.
■C curve: provides cotrol and protection against over current in tertiary and industrial final distribution with TT or TNS grounding system, magnetic trip unit operates between 5 and 10 times ampere rating.
IEC 60947-2 and IEC 60898
DPN Miniature Circuit Breakers Category Numbers
|Rating||B curve||C curve||Rating||B curve||C curve|
Side views of DPN Miniature Circuit Breaker