PURPOSE: To prevent rush current from occurring in hot-line-inserting an electronic circuit package by connecting the first and second positive electrode side terminals with a power supply terminal, taking a time lag.

CONSTITUTION: The lengths of the emitter side power input terminal Te, the gland side power input terminal Tb and the collector side power input terminal Tc of a PNP transistor 1 are of different structures from each other. When inserting the connector Cc of an electronic circuit package into the connector Cp of a power supply line L, it is connected to the positive electrode side terminal TV2, the load side terminal TE and the positive electrode side terminal TV1 of the power supply line L, taking a time lag respectively. It is thus possible to prevent occurrence of rush current, damage to a terminal connecting point and voltage drop on the power supply side.