what is the function of anti-pumping in circuit breaker?
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Answer Posted / vimalraj
If the closing coil circuit (52/CC) is continuously
energized, the anti-pump relay ensures that the circuit
breaker does not “pump” open and closed in the event that a
trip signal is also present. The anti-pump relay
performs this function by allowing the closing coil to
activate only if:
• the circuit is energized
• the drive springs are fully charged, and
• the motor relay is de-energized
The anti-pump relay activates when the close circuit and
motor relay are energized.
If the close circuit is energized continuously, the
anti-pump relay will be latched
in the energized position after the motor relay is
de-energized by a pair of its own
normally open contacts. When the anti-pump relay is
energized, a pair of its
normally closed contacts, in series with the closing coil,
ensure that the closing
coil cannot be energized. The closing coil activates only
when the closing circuit is
de-energized (de-energizing the anti-pump relay), then
closed again
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