A fixing and unlocking mechanism for a plug-in type circuit breaker includes a housing (1) A button (2) is mounted in a button slot (101) of the housing (1). The fixing and unlocking mechanism is characterized in that the housing (1) is provided with a locking mechanism (3) therein, so that the plug-in type circuit breaker cannot be unplugged from a mounting cabinet, and the housing (1) is further provided with an unlocking mechanism (4) therein, which can unlock the locking mechanism (3) to make the plug-in type circuit breaker is unplugged from the mounting cabinet.

Apparatus, system, and method for ganging a plurality of wall mounted control devices, such as keypads. Particularly, an assembly of ganged control devices is provided comprising a pair of adjacently positioned control devices each adapted to control at least one function of at least one associated load. Each control device comprises a housing assembly and at least one button attached to the housing assembly. The housing assembly comprises a pair of oppositely disposed side surfaces each comprising a pair of vertically aligned recesses. Each recess comprises a tapered inner side wall. The assembly further comprises an alignment plate comprising a vertical wall adapted to be positioned in between the pair of control devices and a pair of vertically aligned tabs traversely extending from oppositely disposed side surfaces of the vertical wall. Each tab comprises a tapered outer side wall. The tabs are sized, shaped, and positioned to be inserted into the recesses such that the tapered outer side walls of the tabs form a friction fit with the tapered inner side walls of the recesses to removably attach and align the pair of control devices.

A replaceable key structure includes a key holder and a circuit board. The key holder is disposed above a circuit board. The key holder is formed with a mounting slot for selectively receiving a first key module or a second key module therein. A magnetic sensor and a contact connector are disposed on the circuit board positionally corresponding to the mounting slot of the key holder. The first key module has a shaft, and a magnetic element disposed on the bottom of the shaft. The magnetic sensor can output an analog signal when the magnetic element approaches. The second key module has a trigger switch which has two electrical terminals disposed on the bottom surface of the second key module. When the second key module is installed in the mounting slot, the electrical terminals can be electrically connected to the contact connector.

Example implementations relate to modular keyboards. In an example, a modular keyboard can include a keyboard module including keys, where the keyboard module includes a plurality of locking mechanisms, and a lattice removably coupled by the plurality of locking mechanisms to the keyboard module, where the lattice comprises a keyboard overlay.

A fixing and unlocking mechanism for a plug-in type circuit breaker includes a housing (1) A button (2) is mounted in a button slot (101) of the housing (1). The fixing and unlocking mechanism is characterized in that the housing (1) is provided with a locking mechanism (3) therein, so that the plug-in type circuit breaker cannot be unplugged from a mounting cabinet, and the housing (1) is further provided with an unlocking mechanism (4) therein, which can unlock the locking mechanism (3) to make the plug-in type circuit breaker is unplugged from the mounting cabinet.

A replaceable key structure includes a key holder and a circuit board. The key holder is disposed above a circuit board. The key holder is formed with a mounting slot for selectively receiving a first key module or a second key module therein. A magnetic sensor and a contact connector are disposed on the circuit board positionally corresponding to the mounting slot of the key holder. The first key module has a shaft, and a magnetic element disposed on the bottom of the shaft. The magnetic sensor can output an analog signal when the magnetic element approaches. The second key module has a trigger switch which has two electrical terminals disposed on the bottom surface of the second key module. When the second key module is installed in the mounting slot, the electrical terminals can be electrically connected to the contact connector.

A handle assembly comprised of a base and a detachable handle that mounts to the base. The base includes integrated electronics, such as switches. The detachable handle includes buttons for activating the switches.

A safety switch for the control of access for machines and industrial plants comprises a casing adapted to be fastened to a fixed part of the access to be controlled and housing thereinside switching means) for controlling one or more control and/or service circuits of the machine or plant, driving means adapted to interact with the switching means upon the opening/closing of the access for opening/closing one or more circuits, anchoring means of the casing to the fixed part of the access, the anchoring means being integrated in the casing and adapted to allow the selective fixing to the fixed part of the access according to at least two mutually angled orientations, one or more auxiliary modules adapted to be selectively mounted to the longitudinal upper end of the casing, fixing means for fixing the one or more auxiliary modules to the casing.

A safety switch for the control of access for machines and industrial plants comprises a casing adapted to be fastened to a fixed part of the access to be controlled and housing thereinside switching means) for controlling one or more control and/or service circuits of the machine or plant, driving means adapted to interact with the switching means upon the opening/closing of the access for opening/closing one or more circuits, anchoring means of the casing to the fixed part of the access, the anchoring means being integrated in the casing and adapted to allow the selective fixing to the fixed part of the access according to at least two mutually angled orientations, one or more auxiliary modules adapted to be selectively mounted to the longitudinal upper end of the casing, fixing means for fixing the one or more auxiliary modules to the casing.

A handle assembly comprised of a base and a detachable handle that mounts to the base. The base includes integrated electronics, such as switches. The detachable handle includes buttons for activating the switches.