ABB RELION 611 Series Technical Manual page 156

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Protection functions

When the thermal content reaches 100 percent, the OPERATE output is activated. The

OPERATE output is deactivated when the value of the measured current falls below 12

percent of Current reference or the thermal content drops below 100 percent.

The activation of the BLOCK input blocks the ALARM, BLK_RESTART and

OPERATE outputs.

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Technical Manual