The tool required to undo or retighten the busbar connections on the MGP/PP4 range of circuit breakers is a 17mm bi-hexagon socket or spanner sometimes referred to as a pipe spanner.

If a used circuit breaker is refitted, the busbar connections need to tightened with a torque wrench to the following values:

Ratings up to 250A = 20Nm
Ratings 400 - 630A = 28Nm


See illustrations below for examples of the socket and pipe spanner.

Bi-hexagon socket


Spanner or Pipe spanner

For more details you can refer to Powerpact 4 instruction leaflet

Released for: Schneider Electric Ireland