In one example, a rotary knob switch includes: a knob head; a fixing mount disposed below the knob head and configured to allow at least a portion of the bottom of the knob head to pass through it; cam located at the bottom of the fixing mount and to be mated with the bottom of the knob head, a side of the cam forming at least one protruding control curved surface; and a slider, said slider being coaxial with the cam, ramp with different heights being provided along edge of the slider, wherein, when the cam rotates, the control curved surface of the cam presses the ramp of the slider, such that the slider slides along axial direction towards the bottom of the rotary knob switch, the knob head comprises an indicator block, the lower part of the indicator block is provided with an axial light guide column.

A temperature-dependent switch having a housing with an upper part and a lower part, wherein a first and a second stationary contact are arranged on the housing, and a temperature-dependent switching mechanism having a movable contact member. In its first switching position, the switching mechanism presses the movable contact member against the first contact and thereby produces an electrically conductive connection between the two contacts via the contact member, and, in its second switching position, keeps the movable contact member spaced apart from the first contact. A closing lock prevents the switch, once having opened, from closing again by locking the switching mechanism permanently in its second switching position in a mechanical manner. The closing lock comprises a substantially disc-shaped locking element and a first latching member, which, in order to lock the switching mechanism, interacts in the second switching position with a second latching member that is arranged on the movable contact member.

A temperature-dependent switch comprises first and second stationary contacts and a temperature-dependent switching mechanism having a movable contact member and a temperature-dependent snap-action part, which transitions between geometric low- and high-temperature configurations based on a temperature of the switch. Switching the snap-action part from its geometric low- to high-temperature configuration moves the switching mechanism from a first to a second switching position and thereby opens the switch. A closing lock prevents the switch once having opened from closing again by keeping it in its second switching position. The closing lock comprises a fusible medium which melts when a melting temperature of the medium is exceeded, contacts, in a molten state, a part of the switching mechanism when it is in its second switching position, and solidifies again and thereby locks it in its second switching position when the temperature of the switch falls below the melting temperature of the medium again.

A key holder designed for use with manual key switches affixes a key onto a control box. The key holder includes a rotor housing, a key rotor, and a threaded opening. The key is mounted into the key rotor before being inserted into the control box. Further, the key rotor is rotatably mounted into the rotor housing via the threaded opening. The key rotor includes an interior face, an exterior face, a threaded body, and a key slot. The interior face and exterior face are positioned opposite each other about the threaded body. The key slot traverses through the threaded body. To connect the key rotor to the rotor housing, the threaded body is screwed into the threaded opening. This transforms the rotational motion into the linear motion of the key rotor, which along with the locking feature of the manual key switch, prevents the key from rotating.

A temperature-dependent switch having a housing with an upper part and a lower part, wherein a first and a second stationary contact are arranged on the housing, and a temperature-dependent switching mechanism having a movable contact member. In its first switching position, the switching mechanism presses the movable contact member against the first contact and thereby produces an electrically conductive connection between the two contacts via the contact member, and, in its second switching position, keeps the movable contact member spaced apart from the first contact. A closing lock prevents the switch, once having opened, from closing again by locking the switching mechanism permanently in its second switching position in a mechanical manner. The closing lock comprises a substantially disc-shaped locking element and a first latching member, which, in order to lock the switching mechanism, interacts in the second switching position with a second latching member that is arranged on the movable contact member.

A temperature-dependent switch comprises first and second stationary contacts and a temperature-dependent switching mechanism having a movable contact member and a temperature-dependent snap-action part, which transitions between geometric low- and high-temperature configurations based on a temperature of the switch. Switching the snap-action part from its geometric low- to high-temperature configuration moves the switching mechanism from a first to a second switching position and thereby opens the switch. A closing lock prevents the switch once having opened from closing again by keeping it in its second switching position. The closing lock comprises a fusible medium which melts when a melting temperature of the medium is exceeded, contacts, in a molten state, a part of the switching mechanism when it is in its second switching position, and solidifies again and thereby locks it in its second switching position when the temperature of the switch falls below the melting temperature of the medium again.

A rotary knob switch can include: a knob head; a fixing mount disposed below the knob head and configured to allow at least a portion of the bottom of the knob head to pass through it; cam located at the bottom of the fixing mount and to be mated with the bottom of the knob head, a side of the cam forming at least one protruding control curved surface; and a slider, said slider being coaxial with the cam, ramp with different heights being provided along edge of the slider, wherein, when the cam rotates, the control curved surface of the cam presses the ramp of the slider, such that the slider slides along axial direction towards the bottom of the rotary knob switch, the knob head comprises an indicator block, the lower part of the indicator block is provided with an axial light guide column.

A key holder designed for use with manual key switches affixes a key onto a control box. The key holder includes a rotor housing, a key rotor, and a threaded opening. The key is mounted into the key rotor before being inserted into the control box. Further, the key rotor is rotatably mounted into the rotor housing via the threaded opening. The key rotor includes an interior face, an exterior face, a threaded body, and a key slot. The interior face and exterior face are positioned opposite each other about the threaded body. The key slot traverses through the threaded body. To connect the key rotor to the rotor housing, the threaded body is screwed into the threaded opening. This transforms the rotational motion into the linear motion of the key rotor, which along with the locking feature of the manual key switch, prevents the key from rotating.

A switching device for a medium-voltage electrical circuit including: a frame; a vacuum circuit breaker including a fixed electrode relative to the frame and a mobile electrode; an elastic member; and an actuating lever connected to the mobile electrode via the elastic member, The actuating lever is movable between an open position in which the electrodes are separated by an open distance, and a closed position in which the electrodes are in contact. A passage of the actuating lever from the open position to the closed position defines a displacement stroke, greater than the open distance such that the elastic member is compressed when the actuating lever passes from the first position to the second position. The switching device includes at least one removable spacer arranged between the frame and the fixed electrode.