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Vacuum Interrupter/Operator Description

On the undervoltage release 3AX1103, the latch (25) is held

by the locking pin (21) as long as the armature (9) is ener-

gized. If the circuit of the magnet coil (7) is interrupted, the

armature (9) drops off, thus causing the latch (25) to lose its

support and release the striker pin (23).

Following every tripping operation, the striker pin (23) must

be reset to its normal position by loading the spring (31). This

takes place automatically via the operating mechanism of

the circuit breaker.

Since the striker pin of the undervoltage release 3AX1103 is

latched only when the armature is energized, the undervolt-

age release is provided with a screw (29), for locking the

striker pin (23) in the normal position for adjusting purposes

or for carrying out trial operations during circuit breaker ser-

vicing. Position A (locked) disables the undervoltage release.

Position B (unlocked) is the normal operating position.

Figure 12. Latch Details (shown charged).

Capacitor Trip Device

The capacitor trip device is an auxiliary tripping option

(capacitor trip is a system that should be mounted on the

drawout truck) providing a short term means of storing ad-

equate electrical energy to ensure circuit breaker tripping.

This device is applied in circuit breaker installations lack-

ing independent auxiliary control power or station battery.

In such installations, control power is usually derived from

the primary source. In the event of a primary source fault

or disturbance the capacitor trip device will provide short

term tripping energy for circuit breaker opening due to relay

operation.

The capacitor trip converts 120 or 240 VAC control voltage

to a DC full wave voltage which is used to charge a large

capacitor to the peak of the converted wave.

(Figure 14).

Shock Absorber

Circuit breakers are equipped with a hydraulic shock ab-

sorber (61.8) (Figure 6a). The purpose of this shock

absorber is to limit overtravel and rebound of the vacuum

interrupter movable contacts during the conclusion of an

opening operation. The shock absorber action affects only

the end of an opening operation.

Auxiliary Switch (52a/b)

Figure 6a shows the circuit breaker mounted auxiliary

switch (68). This switch provides auxiliary contacts for

control of circuit breaker closing and opening functions.

Contacts are available for use in relaying and external logic

circuits. This switch is driven by linkage (68.1) connected

to the jack shaft (63). The auxiliary switch contains both 'b'

(Normally Closed) and 'a' (Normally Open) contacts. When

the circuit breaker is open, the 'b' contacts are closed and

the 'a' contacts are open.

Spring Charging Motor (88)

Spring charging motors (50.4) (Figure 6a) are available for

both AC and DC operation. If operated with AC voltage, a

rectifier is installed in the circuit breaker.

Figure 13 Undervoltage Locked/Unlocked Selection.

Figure 14. Capacitor Trip Device