ABB Air Circuit Breaker E1.2 1600 A

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

Perform some closing and opening operations

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

Turn off the voltage supply to the trip unit

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

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 and conditions

Is cable replacement advisable?

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 earth the terminals visibly 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 or equivalent if there is a heavy coating of dirt

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

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

Is the circuit-breaker withdrawable?

Extract the circuit-breaker from the fixed part if withdrawable

Disconnect power supply and visibly ground terminals on both supply and load sides if working on fixed parts

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

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