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.
These tools are widely available from tool suppliers, car accessory shops etc.
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
These tools are widely available from tool suppliers, car accessory shops etc.
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
Released for:Schneider Electric Ireland
