The utility model relates to a fast switch based on permanent magnetism maintain the body. Its characteristics are: guide arm (4) are gone up the cover and are equipped with repulsion dish (6) down, install separating brake coil (5) and install closing coils (7) in its below in these repulsion dish (6) top, keep installing and keeping use quiet iron core with moving iron core (9) top, keep on this with installing switching -on holding permanent magnet (11) in the middle of the quiet iron core, and keep keeping using quiet iron core below moving iron core (9) under installing at this, keep installing the separating brake with quiet iron core centre and keep permanent magnet (14) under this. The utility model provides a simple, quick repulsion switch that the speed of action is fast, work link is few, the reliability is high keeps based on permanent magnetism can effectively improve switch oening speed as a result, through fault current detection technique at zero point, shortens arcing time, alleviates the contact and ablates, improves the circuit breaker ability of cut -offfing.