Eaton Power Circuit Breaker MDS-608

Inspect the breaker for nicked wires, cracks in plastic parts, and loose screws.

Tighten screws or bolts to levels outlined in Table 22.

Apply thread-locking compound to loose screws in plastic parts.

Replace or repair all nicked wiring according to industry practices.

Are the torque values of the operating mechanism and motor mounting hardware within recommended values in Table 18?

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

Is the back end of any contact below the ledge?

Replace the contact assembly if any contact is below the ledge

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

Disconnect power to the motor operator to prevent automatic recharging

Is the pop-out trip indicator 'out'?

Charge the breaker mechanism springs

Press the ON pushbutton to close the breaker manually and verify closing by noting the state of the indicating flag

Charge the breaker mechanism springs again

Disconnect power to the motor operator to prevent automatic recharging

Press the OFF pushbutton to manually open the breaker

Press the ON pushbutton to manually close the breaker. Is the breaker closed?

Press the OFF pushbutton to manually open the breaker. Is the breaker open?

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.

Breaker Mechanism Charging and Indicator Check

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

Disconnect power to the motor operator to prevent automatic recharging.

Check the state of the pop-out trip indicator and reset if it is 'out'.

Press the ON pushbutton to manually close the breaker.