Air Circuit Breaker (ACB)

Air Circuit Breaker (ACB)

1) Under voltage trip device

2) Charging handle: the handle is pumped to manually charge the closing springs. It is       also used for slow closing operation.

3) Open –CLOSED indicator

4) Spring charged indicator: Shows the word “CHARGED” when the closing spring are fully charged and “DISCHARGED” when they are released.

5) Draw –out stopper: These stoppers lock the breaker body in the ISOLATED position, and remove position

6) PUSH TO OPEN BUTTON: Pressing this button trips open the breaker

7) PUSH TO CLOSE BUTTON: Pressing this button closes the breaker

8) Draw-out Stopper: This hole is fitted with a shutter, which opens when the position stopper release lever is turned down

3.19 Operation:

The air circuit breakers are available either in manual charging type or in motor charging type

     1.Manual charging type: In the manual charging type, charging the closing springs and open-close control of the breaker are all done manually. The breaker is closable only when the closing springs are charged.

Spring charging operation:

Pump the charging handle .the maximum stroke of the charging handle is about 105 ‘in angle

When the closing springs are fully charged, a metallic “click” will be heard and no future pumping of the charging handle will be possible. When the charging handle is pumped with its maximum stroke (approx.105’), about four pumping cycle will complete the charging. Check that the spring charged indicator

Closing operation

Before closing the breaker, check the following items.

The closing springs the charged.

The position stopper release lever is in the up position.

The shutter of the draw-out handle insertion hole is completely closed.

The open position padlock lever is not pulled out.

The specified voltage is applied to the under voltage trip device or the function of the under voltage trip device is locked.

Upon satisfactory confirmation of the above items, open manual operation button cover upward and press the push to close button. The breaker is closed. The open-closed indicator shows” closed”, and the spring charged indicator shows “discharged”.