ABB Air Circuit Breaker E1.2 1250 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)

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 as advised?

Verify all tools and materials are removed from the site

Is the area clean and free of debris?

Maintenance Schedule — E1.2 Maintenance

Select the maintenance frequency based on environment

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

Ensure the following before maintenance

Inspections and General Cleaning

Ensure the circuit-breaker is clean

Remove dust and oily substances with a clean, dry cloth and mild detergent if necessary

Use thinner from the greasing kit for thick dirt build-up

Set the circuit-breaker to the open position and ensure the springs of the operating mechanism are discharged

Work with the circuit-breaker removed from the fixed part

Disconnect the power circuit and auxiliary circuits and visibly earth the terminals on both the supply side and load side

Clean and Lubricate Jaw-Type Isolating Contacts

Disassemble safety shutters (only IEC) before cleaning and lubricating

Clean the jaw-type isolating contacts using a laminate thinner such as Chemma 18 if there is a heavy coating of dirt

Lubricate the jaw-type isolating contacts with Mobilgrease 28 at the indicated points

Putting into service — Introduction

Ensure the circuit-breaker is put into service for the first time or after prolonged inactivity

Test the circuit-breaker with all switchgear apparatus de-energized

Verify that the verifications are performed by skilled persons in the electrical field

Ensure sufficient change of air to avoid overtemperatures

Ensure location is clean and free of installation refuse

Verify circuit-breaker is mounted correctly with proper tightening torques and clearances