ACB and MCCB without Micrologic trip unit

[HH1]

If Schneider Electric ACB and MCCB (400A and above) can be used without Micrologic tripping unit? the tripping will be activated only by external relay. If yes, kindly explain how it works.

thanks.

[Gregoire_Brun · Accepted solution]

hello @HH1 

it's possible to use some ACB without trip unit where you can use an external relay equivalent like for medium voltage network. On this case, order to open will be gived to the breaker by a coil (MX).