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Cancel the lock for the undervoltage release by shifting
the locking screw (29.0) from A to B.
23.0
A
29.0
B
Position A: locked
23.0
A
29.0
B
Position B: unlocked
(operating position)
Figure 14: Undervoltage lock/operate selection
19
120 or 240 Vac
supply
Capacitor trip device
25
Figure 15: Capacitor-trip device
20
Item
23.0
29.0
01
T
9
XO
C2
24
52a
23
33
52a
34
A1
52T
A2
2
XO
D2
1
10
3
Description
Construction and mode of operation of
secondary shunt-release and
Striker pin
undervoltage release
Locked/unlocked
The release consists of a spring-power stored-
selection screw
energy mechanism, a latching device and an
electromagnet. Refer to Figure 12:
Construction of secondary shunt release
(shown charged) and Figure 13: Latch details
(shown charged) on page 19 and Figure 14:
Undervoltage lock/operate selection.
These elements are accommodated side by
side in a housing (3.0), with a detachable
cover and three through-holes (5.0) for
fastening screws. The supply leads for the trip
coil are connected to a terminal block (33.0).
The energy-storing mechanism consists of the
striker pin (23.0) and its operating spring
(31.0), which is mostly located inside the
striker pin (23.0). When the spring is
compressed, the striker pin is held by a latch
(25.0), whose sloping face is forced against
the appropriately shaped striker pin (23.0) by
spring (27.0). The other end of the latch
(25.0) is supported by a partly milled locking
pin (21.0), pivoted in the cover sheets of the
magnet armature (9.0). The armature (9.0) is
pivoted in front of the poles of the U-shaped
magnet core, (1.0) and is pulled away from it
by the tension spring (11.0).
If the magnet coil (7.0) of the secondary
shunt release 3AX1101 is energized by a trip
signal, or if the tripping pin (15.0) is
mechanically actuated, magnet armature
(9.0) is swung against the pole faces. When
this happens, the latch (25.0) loses its
support and releases the striker pin (23.0)
that is forced out by the spring (31.0).
On the undervoltage release 3AX1103, the
latch (25.0) is held by the locking pin (21.0)
as long as the armature (9.0) is energized. If
the circuit of the magnet coil (7.0) is
interrupted, the armature (9.0) drops off,
thus causing the latch (25.0) to lose its
support and release the striker pin (23.0).
Following every tripping operation, the striker
pin (23.0) must be reset to its normal position
by loading the spring (31.0). This takes place
automatically via the operating mechanism of
the circuit breaker.
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