Eaton Power Circuit Breaker MDN-412

Charge the breaker mechanism springs using the charging handle or motor operator.

Close the breaker by applying rated voltage to the spring release accessory and verify closing by noting the state of the indicating flag.

Charge the breaker mechanism springs using the charging handle or motor operator.

If using the motor operator, disconnect power to prevent automatic recharging.

Check the state of the pop-out trip indicator. If it is 'out,' reset it.

Verify breaker accessory voltages

Review accessory voltage rating before energizing

Charge the breaker mechanism springs using the motor operator

Close the breaker by applying rated voltage to the spring release accessory

Verify closing by noting the state of the indicating flag

Charge the breaker mechanism springs using the motor operator

Use the mating line of the housing halves as a reference guide for visual inspection

Remove the arc chutes and inspect each primary contact structure for signs of wear and/or damage

Use the contact wear indicator to inspect each contact for wear

Verify the arc chutes are properly replaced as described in the Arc Chute Inspection procedure

Charge the breaker mechanism springs

Close the breaker by applying rated voltage to the spring release accessory

Verify closing by noting the state of the indicating flag

Charge the breaker mechanism springs again

If using the motor operator, disconnect power to prevent automatic recharging

Check if the pop-out trip indicator is 'out'

Verify that the breaker secondary disconnect pins are fully seated and locked into position by lightly pulling on each wire individually

Ensure all pins are straight without bends, corrosion, or evidence of arcing

Note any damaged pins for replacement