Circuit Breaker Internal Components - ABB K-Line Plus KP-8 Installation & Maintenance Instructions Manual

Low voltage power circuit breaker

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Table Of Contents

Table of Contents

ABB

normally closed (N.C.), with either common or isolated

return circuits.

The Trip Lockout prevents circuit

breaker reclosure when the automatic trip indicator is in

the extended position.

indicator, and when so equipped the R/S switch and/or

Trip Lockout, simply push the white indicator in toward

the front escutcheon; it will relatch automatically

(except for breakers with Undervoltage Trip Device -

see discussion later in this bulletin).

It is very important that the operator investigate the

cause of the overcurrent trip prior to resetting the

automatic trip indicator and reclosing the circuit

breaker.

The indicator will also extend when the circuit breaker

is tripped by the optional Under-Voltage Device, or by

the Open Fuse Trip device on fused breakers.

(Note: The circuit breaker can be reclosed without

resetting the automatic trip indicator when the circuit

breaker is not equipped with the optional Trip Lockout.)

Motor Disconnect Switch - On electrically operated

(EO) circuit breakers, a switch is provided when the

operator wants to prevent recharging of the closing

springs, as when the circuit breaker is racked in or out.

It can also be used to disconnect the motor from the

control wiring when performing control wiring dielectric

tests.

Maintenance Handle - This accessory must be

installed underneath the circuit breaker to manually

charge the springs of an electrically operated (EO)

circuit breaker.

Padlocking Device - All K-Line Plus circuit breakers

are provided with a padlock hasp to lock the circuit

breaker in a trip-free condition which prevents circuit

breaker closing. To engage this device, simply push in

the manual trip push button then pull straight out on the

padlock hasp. This hasp can accommodate up to three

padlocks.

When padlocking is engaged the circuit

breaker cannot be racked to any other position.

Manual Trip Button - All K-Line Plus models feature a

manual trip push button for tripping the circuit breaker.

Open/Close Indicator - All K-Line Plus circuit breakers

have a visual indicator showing the status of the circuit

breaker contacts. OPEN appears in silver with a green

background, CLOSED appears in silver with a red

background.

Racking Shutter and Racking Mechanism - The

racking shutter of all K-Line Plus circuit breakers allows

access to the racking shaft when lifted.

To reset the automatic trip

The circuit

breaker must be tripped before the shutter can be lifted

This prevents racking the circuit breaker with the main

contacts closed.

The padlock hasp holds the racking shutter closed

when the hasp is activated. Instructions appear on the

side of the front escutcheon of the circuit breaker for

racking the breaker into and out of its cubicle. Circuit

breaker racking is possible with the cubicle door open

or closed. Indicators on the cubicle indicate the position

of the circuit breaker during racking.

Closing Spring Charge Indicator - On electrically

operated (EO) models, the closing spring charge

indicator shows through a window in the front

escutcheon. A yellow indicator with black lettering

indicates SPRINGS CHARGED; one with white

background and black lettering indicates SPRINGS

DISCHARGED. When the Motor Disconnect Switch is

ON and control power is available, the springs will

automatically charge after any breaker trip operation.

Operation Counter (not shown) - The non-resetable

operation counter advances one count each time the

circuit breaker is closed. The counter on new circuit

breakers may show counts of 9950 or greater so that

the counter will advance to 0000 during check-out prior

to energization.

Circuit breaker operation record

keeping can thus begin from the 0000 point.

Self-aligning Dust Plate - The dust plate immediately

behind the escutcheon face plate is used to exclude

dust from the circuit breaker compartment.

escutcheon face will protrude through the front door of

the compartment when the circuit breaker is in the

"TEST" and "DISCONNECTED" positions.

positions, the dust plate still functions to exclude dust.

Local Electrical Close and Trip Push Buttons

(optional) - On electrically operated (EO) models these

push buttons may be ordered as an option.

switches energize the circuit breaker close/trip coils

when the circuit breaker is in the "TEST and/or

"CONNECTED" position. On manually operated (MO)

breakers with a shunt trip, only the trip push button is

provided when this option is ordered.