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Breakers with ECS or SST Trip Systems
1. Remove the ECS or SST trip unit.
2. Remove the existing flux shifter device and the
trip unit control harness.
3. Install the new flux shifter assembly as described
above and shown in Figure 5.
Installing the Trip Paddle
For breakers equipped with an ECS or SST trip sys-
tem, the existing trip paddle is used with the new
flux shifter.
For all other breakers, the existing trip paddles must
be removed and the new trip paddle installed as
follows:
1. Remove and discard the three trip paddles on the
trip actuator bar, as shown in Figure 8.
2. Assemble the trip paddle and the threaded back
plate by inserting two of the 10-32 x
3
4" screws
and lock washers provided along the top edge.
3. Slip the trip paddle over the trip actuator bar
approximately one inch from the side frame, as
shown in Figure 9. Insert the remaining 10-32 x
3
4" screw and tighten the other screws to
secure the trip paddle in place.
Adjusting the Flux Shifter
After the flux shifter and trip paddle are installed and
the breaker frames are reassembled, the following
adjustments must be made.
1. With the breaker OPEN and the mechanism
charged, set the gap between the trip paddle and
the end of the flux shifter rod at 0.10 inch, as
shown in Figure 10. Use a 0.10-inch diameter rod.
Set the adjuster end of the trip rod and lock it in
place with the jam nut. Note that removal of the
buffer stud will make the trip paddle easier to
install and adjust.
2. As the crossbar travels between the breaker
CLOSED and OPEN positions, the tang of the
actuator bracket must clear the buffer stud. If
there is insufficient clearance, loosen the two
mounting screws and rotate the bracket clock-
wise to take up mounting hole slack. Retighten
the screws.
3. Optional Test – The flux shifter may be tested by
closing the breaker and applying a 9 Vdc power
source to the flux shifter leads (the red wire is
positive). The breaker should trip.
Figure 8. Existing trip paddles to be removed.
Figure 9. Installing the new trip paddle.
Figure 10. Adjusting the flux shifter.
Trip
Paddle
1”
Trip Paddles