Siemens TL.. Manual de instrucciones descargar pdf (Pagina 19)

Operating Instructions

Operating the SB Encased Systems Breaker

Discharging the Stored Energy Mechanism Without

Closing the SB Breaker

Discharging the energy in the stored energy mechanism without

closing the breaker creates an abnormally high shock condition

on the breaker.

Avoid this procedure except for safety and/or

emergency reasons.

To discharge the energy, push and hold the

Open pushbutton and then push the Close pushbutton.

On electrically-operated breakers, the electric operator should

be disabled (one way is to remove the fuse) before discharging

the stored energy. Otherwise, the electric operator automati-

cally recharges the springs. To close the breaker, standard clos-

ing-prevention devices require that the following: (1) a trip unit

must be installed in the SB breaker, (2) the stored energy

mechanism must be fully charged, and (3) the charging handle

must be in the stowed position. On drawout constructions,

the release lever must be in the release-engaged position (up

position).

Accessories that inhibit the breaker from being locally closed

are presented in the Accessories section. Included are a clos-

ing-blocking device for use with remotely-operated circuit

breakers, key interlocks, and other locking devices.

Discharging energy from the stored energy mechanism with-

out closing contacts.

Closing the SB Breaker Locally

Before the breaker can be closed, the stored energy mecha-

nism must be fully charged and all of the closing-prevention

devices (and accessories) must be in the noninhibiting state or

position. In this condition, all that is required to close the

breaker is to push the Close pushbutton. When the breaker is

closed the Contacts Closed/Contacts Open indicator will point

to Contacts Closed.

Indicates that the circuit breaker is Closed with the springs in

the Charged position.

Indicates that the circuit breaker is Open with the springs in

the “Discharged” position.

Opening the SB Breaker Locally

To locally open the breaker, push the Open pushbutton. When

the breaker is open, the Contacts Closed/Contacts Open indi-

cator will point to Contacts Open.

Built-in safety devices trip the SB breaker if the trip unit is

removed or the release lever on the drawout mechanism is

depressed. Performing the trip unit integral test in the trip

mode also trips the breaker.

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