Eaton Power Circuit Breaker MDN-C12

Verify device (Fixed) position of poles is open

Verify device (Fixed) mechanism is discharged

Verify device (Drawout) position of poles is open

Verify device (Drawout) mechanism is discharged

Verify device (Drawout) position in cassette is removed

For Magnum Breakers with Vertically Mounted Primary Disconnects

Verify vertical adapter nuts and bolts are torqued to 37–43 lb-ft

For All Magnum Breakers Primary Disconnects

Charge the breaker mechanism springs

Press the ON pushbutton to close the breaker manually

Verify closing by noting the state of the indicating flag (Figure 93)

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

Review accessory voltage rating to prevent damage

Charge the breaker mechanism springs using the motor operator

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

Verify breaker closing by noting the state of the indicating flag

Charge the breaker mechanism springs using the motor operator

Charge the breaker mechanism springs using one of the following methods

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 one of the following methods

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

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

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 inserted into plastic parts.

Replace or repair all nicked wiring in accordance with accepted industry practices.

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