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ABB ASTO-21C Original ABB package ASTO21C
The relay is independent of the rated motor current, the insulation class
and the method of starting.
The PTC sensors are connected in series to the terminals Ta
and Tb (or
Ta
and Tbx without short-circuit detection). The number of possible PTC
sensors per measuring circuit is limited by the sum of the individual PTC
sensor resistances:
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