Disclosed is a safety connector which can prevent “latch-up” of a battery management system (BMS) for managing a battery in a hybrid electric vehicle. The BMS connector requires that connectors be inserted into a connector base in a specific order. In particular, a first connector must first be inserted into a first connector insertion port to unlock a locking module disposed between the first connector insertion port and a second connector insertion port before any connector can be inserted into the second connector port.