Power-loss trigger safety tongs

The utility model belongs to the technical field of elevator safety tongs, and particularly relates to a power-loss trigger safety tongs which are used for stopping an elevator car or a counterweight when the elevator car is overspeed and comprise a mounting seat, and a trigger mechanism, a brake mechanism, a detection mechanism and a control system are arranged on the mounting seat. The triggering mechanism is used for triggering the braking mechanism when the elevator car overspeeds or is powered off; the braking mechanism is used for braking the elevator car or the counterweight when the elevator car is overspeed or powered off; the detection mechanism is used for detecting action and reset states of the brake mechanism; the control system is electrically connected with the trigger mechanism, the brake mechanism and the detection mechanism; the trigger spring is arranged in the electromagnet, the trigger delay time is shortened, and the whole mechanism is compact and can adapt to different hoistway environ