The utility model discloses a protection contact performeter, including battery, relay, pilot lamp and binding post, the relay includes relay coil and normally open contact, relay coil with normally opened contact series constitutes relay self -sustaining return circuit, the pilot lamp set up in relay self -sustaining return circuit is used for instructing the return circuit break -make, binding post with the battery reaches relay coil constitutes monitoring loop, its including respectively with a binding post and the 2nd binding post of protection contact connection, when the protection contact is closed, monitoring loop switches on and takes the dynamic relay action so that relay self -sustaining return circuit switches on, the battery anodal with the relay coil connection switches on. Adopt the utility model discloses a protection contact performeter, overload protection device is effectively kept watch on to the action condition of supervision that can be convenient contact.