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ABB
Tripper Bar Travel
Adjustment Screw
Trip Latch
Engagement
Adjustment Screw
Figure 8. Trip Latch Adjustments. Right-hand view shown. Drawn in the latched closed
position.
Shunt Trip Device
Adjustment establishes sufficient range of trip rod
travel and impact energy to actuate the trip latches.
Perform this adjustment only when the device has
malfunctioned, been removed, or been replaced. This
adjustment must be made after any adjustment to the
trip latch.
WARNING
This adjustment is made on a closed breaker. Keep hands and
tools clear of moving parts while setting the device. The
breaker may trip before the point anticipated.
Armature
Sealing
Action
Figure 9. Shunt Trip Device. Viewed from
front
as
mounted
mechanism housing. Device is typical of all
breakers, except for small frames with an
electronic trip system.
Courtesy of NationalSwitchgear.com
Primary
Trip Latch
Trip Rod
Adjustment
on
the
left-hand
Mechanism Housing
1.06
F
drag
K-225 through K-2000, K1600S, K-2000S, K-1600M,
and K-2000M
(All large frame breakers and small frame breakers
without electronic trip.)
1. Locate the device, illustrated in Figure 9, on the
left side of the mechanism. On an open breaker,
fully reverse (CCW) the adjustment of the trip rod.
2. Close the circuit breaker.
3. Seal the coil armature by pushing it into the
device as far as it will travel. If the breaker trips,
advance the trip rod CW 2-1/2 revolutions.
4. If the breaker did not trip when the armature was
sealed in step #3, hold the sealed-in position and
advance the trip rod CW until the breaker trips
open. From the trip threshold, establish over-
travel by advancing the trip rod CW an additional
3 revolutions.
K-600S, K-800S, and K-800M
(All small frame breakers with electronic trip.)
1. Locate the device, illustrated in Figure 10, on the
left side of the mechanism. On an open breaker,
fully reverse (CCW as viewed from the hex head)
the adjustment of the trip rod, or at least enough
that a closed breaker will not trip with the device
armature sealed.
2. Close the circuit breaker.
3. Seal the armature by pushing it into the device as
far as it will travel. Be aware that the breaker may
trip if the trip rod in step #1 was not reversed
enough. Hold the sealed-in position and advance
the trip rod CW until the breaker trips open. This
is the trip threshold.
4. From the trip threshold, establish over-travel by
advancing the trip rod one additional revolution
CW.
2
IB 6.1.12.1-1C
1
(Right-hand)
Secondary
Trip Latch
Tripper Bar
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