ABB REL 551 2.3 Series Installation And Comissioning Manual page 84

Line differential protection terminal
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78
Automatic reclosing function (AR)
Terminal
AR01 - CLOSE CB
Trip
AR01 - CB CLOSE
AR01 - CB READY
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The operation can be set at Stand-by (Off) in HMI tree:
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If any timer setting is changed so as to speed-up or facilitate the
testing, they must be set to normal after the testing. A verification
test has to be done afterwards.

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