For Masterpact NW, fixed mount breakers, what is the part number for the optional hold down bar for the secondary connectors?
For Masterpact NW, fixed mount breakers, the secondary connectors are normally held in place when they are plugged on to the top of the breaker (see first picture below).
If the situation should require it, an optional retention bar is available to hold down the connectors (see second picture below).
The secondary connector retention kit is part number NWSCRK. See instruction document HRB64150.