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ACCESSOR I ES
Auxiliary contacts - AUX The SACE Tmax XT circuit-breakers can be equipped with auxiliary contacts that signal the status of the breaker and can be routed outside the circuit-breaker itself. The following information is available: • open/closed (Q): indication of the status of the circuit-breaker power contacts; • trip (SY): signals that the circuit-breaker is opening due to the intervention of the trip unit, or to the intervention residual current device, or to the opening of undervoltage/shunt opening releases, or to the use of the emergency opening pushbutton of the motor operator, or to the use of the test button; • trip unit tripping (S51): indicates that one of the protection functions of the electronic or ther- mal-magnetic trip unit has tripped. In case of the Tmax XT5 equipped with thermal-magnetic trip unit and residual current device, S51 is activated also by the intervention of the residual current device. • YO/YU tripping (S52): indicates that the under voltage or shunt opening release has been activated. The signaling depends on the service release used. For Tmax XT6 S52 can be used only with YU and is not available for YO. For Tmax XT5, in case of YO, shunt opening release must be permanently sup - plied to maintain the S52 signal.
AUX for XT1, XT2, XT3, XT4, XT5 and XT6
Circuit -breakers XT1-XT3
XT2-XT4
XT5
XT6
AUX
Q SY Q SY
S51
Q SY
S51 S52
Q SY
S51 S52
24V DC
250V AC/DC
400V AC
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24V DC and 250V AC/DC auxiliary contacts
Auxiliary contacts Q (open/closed), SY (trip), S51 (trip unit tripping) and S52 (YO/YU tripping) status during sequences Actions Q SY S51 S52 Normal Sequence CB Opened 12 96 06 26 CB Closed 14 96 06 26 Trip sequence (caused by: Trip Test) CB Opened 12 96 06 26 CB Closed 14 96 06 26 CB Tripped 12 98 06 26 CB Reset 12 96 06 26 Trip sequence (caused by: trip unit) CB Opened 12 96 06 26 CB Closed 14 96 06 26 CB Tripped 12 98 08 26 CB Reset 12 96 06 26 Trip sequence (caused by: YU / YO) CB Opened 12 96 06 26 CB Closed 14 96 06 26 CB Tripped 12 98 06 28 CB Reset 12 96 06 26 S51
Q
SY
S52
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