The utility model discloses a portable emergent change of joining in marriage, including base and casing, this base lower part is equipped with the gyro wheel, is equipped with the transformer and the low -voltage circuit breaker that connect through the copper bar in this casing, and this transformer is equipped with incoming wire terminal, this low -voltage circuit breaker and is equipped with terminal outgoing lines, the transformer is dry -type transformer, and this transformer is furnished with crossing current formula cooling blower and temperature -detecting device, and this temperature -detecting device and this cooling blower match, and simultaneously, the top of this casing inner chamber is equipped with the fan of ventilating. Low -voltage circuit breaker is intelligent omnipotent circuit breaker. The casing is the stainless steel material preparation. The utility model has the advantages that: application scope is wider, and the comprehensive properties preferred.