Abstract: A safety switch in which one piece of cam plate 1 (51) which rotates and moves the operating rod 6 (7) of the contact of the switch portion as the actuator 102 enters the operating portion 111 (511), and the lock plates 2, 3 (lock pieces 52, 53) are arranged on the side of the cam plate 1 (51) to form a lock mechanism for restricting the rotation of the cam plate 1 (51) so that the lock mechanism of the cam plate 1 (51) by lock plates 2, 3 (lock pieces 52, 53) is released and the cam plate 1 (51) is rotated only when the actuator 102 enters, thereby preventing the operating portion from being operated by any tool other than the special-purpose actuator. In one of the specific embodiments, the cam plate 1 is formed with recesses 1a, 1b and lock grooves 1c, 1d, and the lock plates 2, 3 are respectively formed with inclined surfaces 2a, 3a and engaging pawls 2c, 3c for fitting into the lock grooves 1c, 1d.

Abstract: An operation indicating device for electromagnetic relay which comprises a working member interlockable with an armature of an electromagnetic relay and extending into a space above a yoke, and an indicating member coupled to the working member and having an axis rotatably supported in the space above the yoke, the indicating member having a recognizable indicating portion and being rotatable by the working member interlocking with the armature during the operation of the armature, the indicating portion of indicating member thus rotated arriving at a position corresponding to an indication window formed in a case cover.When the armature is activated, the working member, interlockable with armature, is activated and the indicating member coupled to the working member is rotated around a supporting shaft serving as the fulcrum.