GE AK-50 Installing the Trip Unit Mounting Bracket, EC or Power Sensor Trip System

Installing the Trip Unit Mounting Bracket

The new ProTrip trip unit mounts to the left side of the front channel. A mounting bracket is shock-- mounted to a plate that is assembled to the front channel.

EC or Power Sensor Trip System

1.The holes for the new mounting plate may have to be added to the front channel. The drill pattern

is shown in Figure 11, with a full-size template in the Appendix. Tap the holes for 1/4-20 screws.

2.Attach the new mounting plate, as shown in Figure 12, with two short 1/4-20 screws and lock washers on the top and the single long 1/4-20 screw and lock washer on the bottom. Be sure to insert the spacer between the mounting plate and the breaker channel, as shown.

3.Attach the trip unit mounting bracket to the plate with two screws, lock washers, and flat washers, as shown in Figure 13.

ECS or SST Trip System

Remove the existing mounting plate and bracket. Install the new mounting plate and bracket, using the holes closest to the front of the breaker, as described in steps 2 and 3 above.

If the manual indicator assembly busing on AK-50 manual breakers interferes with the mounting bracket installation, then the bracket must be modi- fied. Cut off a 3/4 x 11/2 inch section from the right front of the plate to provide clearance.

Figure 11. Mounting hole drill pattern for the trip unit mounting

plate.

Figure 12. Trip unit mounting plate attached to the breaker front

channel.

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