About Low-voltage Power Distribution ...
Since a triac element in UT-SY21 type and UN-SY11/21/31 canopen/close, surge voltage does not occur. Therefore, a coil surgesuppressor is not needed for them. More Details >>
About Low-voltage Power Distribution ...
It is the utilization category for opening/closing a heater load ofsemiconductor contactor specified in IEC60947-4-3. Utilization categoryAC-51 applies for "... More Details >>
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