The utility model relates to an overcurrent protection element for a programmed distribution frame.Short-circuit current limiters are used in system expansions and new systems to reduce short-circuit current and detect and limit short-circuit current when the current waveform is less than 1ms during the first rise.Adjustable resistance can also be used as a voltage divider or a current limiter Fixed resistors can also be used as voltage dividers or current restrictors Capacitors can also be used as voltage dividers or current restrictors (in AC circuits) Inductors can also be used as voltage dividers or current limiter Utility model has simple structure, can satisfy the requirement of the high power choke, also very easy to satisfy various different choke circuit, can prevent the excess current flows through the load current, ensure the electrical appliances will not work in excess of current state, therefore, can effectively protect the safety of using electrical, prolong the service life of electrical appliances. 1. Fast operation speed and response time less than 20ms (within one power cycle); 2. It can be triggered automatically in case of power system failure;Can reduce short circuit current by more than half; 3. After the fault line is opened and opened by the circuit breaker, it can be automatically reset and operate for many times within a few seconds to cooperate with reclosing; 4. During normal operation, the power consumption should be close to zero, and the maximum power consumption should not be higher than 0.25% of the transmission power; 5. The reliability shall be higher than that of the circuit breaker operating at the same time.