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Operator controls

The following figure shows the available ETU types of the 3VA2 molded case circuit breakers. You can decide which ETU to install according to the area of application.

LED displays

The following table explains what the LED displays mean:

ETU 3-series units

3-series electronic trip units are equipped with setting buttons. A description of the operating principle of the setting buttons and operating instructions can be found in chapter Guide to setting the tripping characteristic.

Displays on ETU 5-series and 8-series units

5-series and 8-series electronic trip units have an LCD display. The displayed values are refreshed once per second.

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The following table explains what the symbols in the display mean:

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The following table explains what functions are performed by the buttons next to the display:

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Displays on ETU 5-series and 8-series units

The basic structure comprises the following displays:

  • Standard display

  • Alarm display

  • Measured value display

  • Parameter display

If no selection is made within an adjustable time period, the standard display will appear.

Standard display

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Alarm display

Active alarms are displayed consecutively in screens AV1 … AV5. If no alarms are active, these screens are concealed.

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Measured value display

The table below explains the measured value display:

Parameter display

The table below explains the parameter display:

Setting and changing parameters

  1. Use the arrow keys to navigate to the correct display.

  2. Press the <OK> button.

    → Edit mode is active. Activation is confirmed by display of "pencil" symbol.

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  3. Use the arrow keys to adjust the parameter setting.

  4. Confirm the setting with the <OK> button, or cancel the operation with <ESC>.

    → The setting is accepted with <OK>. The parameter display now appears.

"Tripped" display

After the ETU has initiated a trip, the "Tripped" display automatically appears:

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This screen can be identified by the word "Trip" which is displayed in the top, right-hand corner. The displayed current value shows the current at the moment of tripping.

Press <ESC> to exit the display.

The additional information contained in the "Tripped" display is explained in the table below:

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Diagnostics display

When a TD500 test device is connected, you can use it to initiate a test. The following screen appears when a TD500 is connected. The bar flashes at a frequency of 0.5 Hz.

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The bar travels from left to right while testing is in progress. The test ends with a trip.

Activation limits

The table below shows the activation limits for the ETUs:

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Name of the ETU

Front interface

Pushbuttons

LED display

Setting buttons

LCD

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