TERASAKI AME Series, Instruction Manual

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KRB-5200h
-18-
1) ON operation
Caution

If the ACB trips open automatically, remove the cause before closing the ACB.
Otherwise, a fire could result.
Closing an external ON switch (not supplied) will close the ACB within 0.1 second.
Caution : When the ACB is equipped with the undervoltage trip device (UVT), the UVT coil must
be excited to permit the ON operation. Apply voltage to the UVT and wait for 120 ms before
doing ON operation.
Caution : After ON operation, open an external ON switch. If the external ON switch remains
closed, the anti-
pumping relay “X” will prevent the ACB from being re-closed (ON) after OFF
operation.
Caution : When the lock plate is drawn out, the electric circuit is disconnected and the ACB
cannot be closed.
Make sure the lock plate is pushed in securely before ON operation.
2) OFF operation
Caution

If the breaker does not close within three seconds after OFF operation, turn off the operating
voltage.
Otherwise, burnout could result.
Closing an external OFF switch (not supplied) will open the ACB within 3 seconds.
3) Tripping operation
When the overcurrent trip device (OCR), UVT, or shunt trip device (SHT) is activated, the ACB
trips open and the indicator turns white automatically.
Pressing the trip button will lead to the same result.
4) Reset operation
To close the tripped ACB, the reset operation is necessary. To reset the ACB, close an external
OFF/RESET switch. The ACB will be reset within 3 seconds.

When the UVT coil is not excited, the ACB can be reset but not closed.

If the motor operator is equipped with an auto-reset function (optional), it will be reset
whenever the ACB trips open.

When the auto-reset function is activated, the alarm switch remains ON only for an instant
(0.7 to 1 second). If you want to use the alarm switch as a trip signal output, install a
self-hold relay between the alarm switch and a trip signal input.