Patent ID: 9711313
Date: 2017-07-18
CPC Classifications: H01H

Claim:
1. An instant trip apparatus of a molded case circuit breaker, the instant trip apparatus comprising: a case; a magnet part disposed in the case and configured to generate a magnetic attractive force when an accident current flows therethrough; an armature disposed to face the magnet part and configured to rotate toward the magnet part by the magnetic attractive force; an armature spring configured to bias the armature to its original position; and a gap maintenance part configured to restrict the rotation of the armature so that a gap defined between the armature and the magnet part is maintained when the accident current occurs, wherein the gap maintenance part comprises a rotation restriction member that is disposed to be exposed to a path of rotation of the armature between the armature and the magnet part, and wherein the rotation restriction member protrudes from an inner surface of the case and at least a portion of the protruding rotation restriction member is exposed to the path of rotation of the armature.