Torque indicating apparatus for electrical device and electrical device

An electrical device, characterized by comprising:

• a housing comprising a threaded hole and an indicating window;
• a bolt arranged in the threaded hole and threadedly fitted with the threaded hole;
• and
• a torque indicating apparatus arranged in the housing, comprising:
• a torsion member arranged in the housing of the electrical device and coupled to the bolt of the electrical device, wherein during a process of the bolt being screwed into a threaded hole of the electrical device to a predetermined position, the torsion member is adapted to be pressed by the bolt and undergo deformation, and the torsion member comprises:
• a pair of elastic parts, spaced apart from each other by a predetermined distance, and adapted to contact the bolt to be pressed and move closer to each other during the process of the bolt being screwed into the threaded hole to the predetermined position;
• a pair of extending parts respectively coupled to the pair of elastic parts and adapted to extend along an axial direction of the bolt;
• and
• a connecting part arranged between the pair of extending parts and coupled to the pair of extending parts;
• and
• an indicator movably coupled to the housing of the electrical device and adapted to move between a looseness position and a tightness position in response to the deformation of the torsion member, wherein in the looseness position, the indicator indicates that a torque between the bolt and the threaded hole is lower than a predetermined torque requirement, and in the tightness position, the indicator indicates that the torque between the bolt and the threaded hole reaches or exceeds the predetermined torque requirement, wherein the indicator is adapted to be partially exposed in the indicating window when it is in the looseness position.