ABB Air Circuit Breaker E4.2-A 3200 A

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 Frequency and Operations

Select the frequency of maintenance activity

Refer to the kit sheet for maintenance operations

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 the safety shutters (only IEC) before cleaning and lubricating the jaw-type isolating contacts

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

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

Check that the interlocking devices are installed and operate correctly

Ensure interlocks are not tested in the Test or Disconnected positions

Maintenance Frequency and Operations

Select the maintenance frequency condition met

Is cable replacement advisable?

Open the circuit-breaker (Circuit-breaker OFF)

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

Adjust the protection trip unit according to design specifications (Trip unit Parameters)

Power the protection trip unit with an Ekip TT unit if necessary

Remove the Ekip TT unit if present

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 persons skilled in the electrical field

Ensure sufficient change of air to avoid overtemperatures

Check for a clean location, free of all installation refuse

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