Operating Mechanism; Primary Trip Latch; Tripper Bar Adjustment; Primary Close Latch - ABB K-Line Plus KP-32 Installation & Maintenance Instructions Manual

IB 6.2.11.1-2C
Page 15
i. Re-install arc chutes.

Operating Mechanism

The circuit breaker mechanism is adjusted at the factory
for correct operation and should not be disturbed unless
necessary.
FOR SAFETY: Keep hands clear of all moving parts.
Serious injuries can result if a person comes in contact
with breaker parts when the breaker is being opened or
closed, or closing springs are being charged or
discharged. Use extension tools for manipulating
breaker parts.
If field testing indicates breaker malfunction, the
following items may be checked. Values shown herein
are approximate and may have to be adjusted slightly to
account for manufacturing tolerances and wear during
use.
Primary Trip Latch. Figure 5 shows the arrangement
necessary for the breaker to be in the closed position.
The spring holds the secondary trip latch down against
screw (1). The secondary trip latch holds the
secondary latch roller up, which in turn holds the
opposite end of the primary trip latch down.
prevents the primary latch roller from moving to the left
and opening the breaker. If none of the various trip
devices are acting on the tripper bar or the auxiliary
latch tripper to open the breaker or to prevent the
breaker from closing and the breaker still will not close,
then the following adjustment should be made.
a. Turn screw (1, Figure 5) down to insure that the
secondary trip latch will hold the secondary latch roller
up.
b. With the breaker closed, turn up on screw (1) until
the breaker trips.
c. Turn screw (1) down approximately two turns.
Tripper Bar Adjustment (Figure 6). To insure that the
This
tripper bar and tripper are in the correct position with
the secondary trip latch, check and adjust as follows:
a. Turn screw (1, Figure 6) down to make certain the
tripper will not trip out the breaker.
b. With breaker closed, turn screw (1) up until the
breaker trips.
c. Turn screw (1) down approximately 2¾ turns.
Primary Close Latch (See Figure 7). With the circuit
breaker closing springs charged, the breaker contacts
opened, and the closing plunger (3, Figure 7) in de-
energized position, there should be about a 1/16" air
gap between the rod (1) and the secondary latch (2) at
point "A".
dimension.
Turn rod (1) for approximate 1/16"
ABB