ABB Air Circuit Breaker E4.2-A 2500 A

Open the circuit-breaker (Circuit-breaker OFF)

Switch the circuit-breaker in withdrawable version to the connected position and reposition the crank in its seat (Circuit-breaker connected)

Adjust the protection trip unit in accordance with the design specifications of the installation (Trip unit Parameters)

Remove the Ekip TT unit if present (Removal of the Ekip TT)

Connect the auxiliary voltage (Connecting the voltage)

Close the switchgear door (Closing the switchgear)

Charge the closing springs (Charging the springs)

Ensure the undervoltage coil is energized (Undervoltage coil)

Frequency in standard environments

Frequency in dusty environments (dust level > 1mg/m3)

Set the circuit-breaker to the open position and discharge the springs of the operating mechanism

Is the circuit-breaker withdrawable?

Disconnect power supply to power circuit and auxiliary circuits and visibly ground the terminals on both supply and load sides

Inspections and General Cleaning

Ensure the circuit-breaker is clean

Check that the interlocking devices are installed and operate correctly

Ensure interlocks are not tested in the Test or Disconnected positions

Document the maintenance frequency based on the table guidelines

Was the cable replacement performed after a trip due to a short-circuit?

Was the cable replacement performed as part of the 3-year maintenance cycle?

Power the gearmotor to charge the springs at the relevant rated voltage

Perform some closing and opening operations

Power the undervoltage coil and perform closing operation on the circuit-breaker

Turn off the voltage supply to the trip unit

Power the undervoltage coil and perform closing operation again

Check that the interlocking devices are installed and operate correctly

Ensure interlocks are not tested in the Test or Disconnected positions

Describe any issues found during the interlock check

Maintenance Activity: Functionality

Perform maintenance as indicated in the table below

Refer to kit sheet for detailed maintenance operations

Maintenance Activity: Lubrication