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Operation and execution of the tripping function

CAUTION

Personal injury, spurious tripping and irreparable damage to the TD300 activation and trip box

Use of the TD300 when the molded case circuit breaker is not de-energized can result in personal injury, spurious tripping of the circuit breaker and irreparable damage to the TD300.

Disconnect the molded case circuit breaker from the power supply before using the TD300 activation and trip box.

TD300: Connect, switch on and off, disconnect

Connect the TD300 to the 3VA2 molded case circuit breaker

  1. Disconnect the molded case circuit breaker from the power supply.

  2. Insert the connecting cable in the test socket of the ETU.

Switch the TD300 on and off

  1. Check whether the molded case circuit breaker is disconnected from the power supply. If it is not, disconnect it.

  2. Push the slide switch to ON.
    The LED labeled "ACT" on the TD300 lights up and the ETU display is activated. The TD300 is ready.

    If the "ACT" LED does not light up:

    • Push the slide switch to OFF.

    • Detach the connecting cable from the molded case circuit breaker.

    • Replace the batteries.

    • Follow the correct sequence of steps to connect the unit to the molded case circuit breaker again.

    • Push the slide switch to ON.

  3. Push the slide switch to OFF.
    The LED labeled "ACT" on the TD300 goes out to indicate that the unit is switched off.

Disconnect the TD300 from the 3VA2 molded case circuit breaker

  1. Switch off the molded case circuit breaker (OFF position).

  2. Detach the connecting cable from the molded case circuit breaker.

LED states when the TD300 and the molded case circuit breaker are switched on

Test the molded case circuit breaker (mechanical trip test)

  1. Connect the TD300 to the molded case circuit breaker in the correct sequence and switch on.

  2. Switch on the molded case circuit breaker (ON position).

  3. Press the pushbutton labeled <TRIP> on the TD300.

    The molded case circuit breaker trips:
    The molded case circuit breaker is functioning correctly.

    The molded case circuit breaker does not trip:

    • Switch off the TD300.

    • Switch off the molded case circuit breaker (OFF position).

    • Detach the connecting cable from the molded case circuit breaker.

    • Connect the TD300 correctly to the molded case circuit breaker again and switch on.

    • Repeat the trip test (by pressing the pushbutton labeled <TRIP> on the TD300).

    • If the molded case circuit breaker fails to trip again, contact Technical Support .

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