Siemens 3AH Инструкции, установка, эксплуатация, обслуживание - Страница 15

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Interrupter/Operator Description

Shock Absorber

Type 3AH circuit breakers are equipped with a sealed, oil-

filled, viscous damper, or shock absorber (61.8) Figure 6.

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 opera-

tion.

Figure 6 shows the breaker mounted auxiliary switch. This

switch provides auxiliary contacts for control of circuit

breaker closing and tripping functions. Contacts are avail-

able for use in relaying and external logic circuits. This

switch is driven by linkages connected to the jack shaft.

The auxiliary switch contains both 'b' (Normally Closed)

and 'a' (Normally Open) contacts. When the circuit breaker

is open, the 'b' switches are closed and the 'a' switches are

open.

Figure 10. Latch Details (shown charged)

Figure 11. Undervoltage Block/Operate Selection

Figure 12. Capacitor Trip Device