Schneider, as a specific example, also has the means of automatically resetting the toggle position with a motor operator when configured to do so.
MCCBs can be confusing as the presence of a trip position on the toggle gives rise to 3 possible states rather than two, as opposed to something like an Air Circuit Breaker.
Important definitions (may vary by manufacturer, at least one I know of goes to the trip position from open when tripped via a remote coil or test position):
Open operation (carried out by a motor operator, not suitable for use with protection functions that expect the breaker to open)
Trip operation (either via onboard protection unit or via trip coil and external interface)
Close operation (via motor operator only)
An open operation will effectively put the MCCB toggle in the open position. An open operation is also often used to reset the MCCB remotely when tripped.
A trip operation will generally (I've not come across one that doesn't) put the toggle into the trip position.
A close operation will put the toggle into the closed position.
The distinction arises in terms of what has caused the breaker to go to the trip position, is it a fault detected by an internal protection device, or is it from an external device?
The operation to be undertaken may vary depending on the circumstance, such as a backup UV release being used to ensure the breaker is open when voltage is lost. In that case the breaker can be automatically reset and put into service.
In such a case something like the SDE contact for a Schneider breaker is used as it flags an internal trip but not an external one.
EDMS Australia
