Parallel connection of a mechanical PCS has the advantage of the total switch current capacity increase without decrasing the infinite OFF resistance. In this study, quench current characteristics of parallel NbTi mechanical PCSs are experimentally investigated by using two PCSs which have different critical current and junction resistance. The quench current of the parallel PCSs can increase up to the sum of each PCS quench current at the most and can be estimated by considering current distribution and critical current of each PCS. Dynamic change of current distribvution which is caused by the proeceding quench of one PCS is also crucial for the total switch current capacity. When the current distribution changes so fast by the preceding quench, the posterior quench of the other PCS occurs with a time delay after the current exceeds the critical current. However, degradation of quench current by the fast change of current througy the PCS is not found within a rate of 2x10~5A/s.
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