Siemens 3AH3 Instruction Manual page 23

The schematic shown in Figure 14 is
intended to aid in understanding the
mechanism operation discussed in this
instruction manual. It shows a drawout
circuit breaker as an example. Refer to the
schematic diagram furnished with your
circuit breaker for specific information.
Close coil (52SRC)
The close coil (3AY1510) is a standard
component of the circuit breaker that is
used to unlatch the stored energy of the
closing spring and thus close the circuit
breaker electrically. It is available for either
ac or dc operation. After completion of a
closing operation, the close coil is
de-energized internally. If operated with ac
voltage, a rectifier is installed in the circuit
breaker.
Trip coil (52T)
The trip coil (3AY1510) is a standard
component of the circuit breaker. The
electrically supplied tripping signal is passed
on to the trip-latching mechanism by means
of a direct action solenoid armature and the
circuit breaker is thus opened. It is available
for either ac or dc operation. After
completion of an opening operation, the
trip coil is de-energized internally. If
operated with ac voltage, a rectifier is
installed in the circuit breaker.
50.0
55.0
Item
50.0
50.5
53.0
54.0
55.0
Figure 12: Use of manual spring-operation crank
50.5
50.6
Item
50.0
50.5
50.6
Figure 13: Use of manual spring-charging crank
50.5
Description
Hand crank
Manual spring-charging port
Manual CLOSE pushbutton
Manual OPEN (TRIP)) pushbutton
CHARGED/DISCHARGED indicator
50.0
Description
Hand crank
Manual spring-charging port
Over-running coupling
53.0
54.0
23