Table I. Because the xm values in Table I are defined for O<J<1, this applies for the K values as well. In order to extend this definition to J=0, we make the allocation: J=0 corresponds to K=0 (2.15) and look for the consequences. According to (2.5) we get for K=0: UT=0. This, however, can only be obtained when the inductance of the considered circuit approaches zero which represents the most critical case for switch-on. It is furthermore important to recognize that the above allocation (2.15) excludes the case R—>co (no load). The switch does not trip when its energy balance is positive, i.e. when EF<U0 ■ II - Tf (Tf: trip time) (2.16) is valid. By combining (2.10) and (2.16), the following condition is established for the capacitor:
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