Structure And Function - ABB AMVAC Installation And Operation Manual

C B
IRCUIT REAKER
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TRUCTURE OF THE CIRCUIT BREAKER POLES
The encapsulated poles are mounted on the rear flat section of the circuit breaker enclosure. The live parts of the circuit
breaker poles are enclosed in cast resin and protected from impacts and other external influences.
With the circuit breaker closed the current path for each pole leads from the upper circuit breaker terminal (25) to the
fixed contact (24.2) in the vacuum interrupter (24), then via the moving contact (24.1) and the flexible connector (21) to
the lower circuit breaker terminal (22). This path can be reversed.
The change of contact state is delivered by means of the insulated link rod (19) with internal contact force springs (20).
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TRUCTURE OF THE OPERATING MECHANISM
The operating mechanism consists of a magnetic actuator (10), control module (27) with sensor systems, storage
capacitor(s) (26), and linkages which transmit the force to the breaker poles.
In addition, there are supplementary components for emergency manual opening and the controls are located on the
front of the enclosure.
The actuator (10) transmits the actuating force on the three circuit breaker poles by way of the lever shaft (18). The
storage capacitor(s) (26) provides the necessary actuating energy on demand.
The positions of the poles, in the circuit breaker are detected by two sensors (15) and (16) directly at the lever shaft
(18).
There are name plates with the ratings of the circuit breaker on the front panel (1.1) and on the inside rear wall just left
of the actuator (depending on options the label may be located on the inside lower left wall).
The basic version of the magnetic actuator mechanism is fitted with the following controls and instruments:
 Signal lamp for switching readiness ("READY" indication lamp) (2)
 CLOSE push-button (3)
 OPEN push-button (4)
 Mechanical operating cycle counter (5)
 Mechanical CLOSE/OPEN indicator (6)
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TRUCTURE OF THE CONTROL MODULE
The control module consists of a single circuit board (27). This board contains a series of components:
 AC/DC converter
 Logic circuit / Power Electronics
 Electric optoccouplers for input
 Relays for output
 Power electronics to control the actuator coils
 Sockets for control and signals
The board is connected by a plug connector which ensures safe and trouble-free wiring. The boards and components
are not user serviceable.

STRUCTURE AND FUNCTION

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TRUCTURE
(Refer to Figure 2)
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1VAL050601-MB Rev C
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