A switching mechanism for a dual power supply transfer switch. The switching mechanism has a switching assembly, which includes a driving plate, a driving rod, an actuator and an auxiliary mechanism. The driving plate includes an arc-shaped driving groove. The driving rod extends into the driving groove. The auxiliary mechanism includes a spring. The driving plate is able to rotate under an external force. The driving groove bypasses the driving rod when an end of the driving groove does not contact the driving rod, and the driving groove pushes the driving rod to rotate over a first angle and urges the spring to deform when the end of the driving groove contacts the driving rod. The spring recovers and drives the driving rod to rotate over a second angle after the spring having passed a dead point, thus causing the actuator turning on or off a first power supply. The switching mechanism also includes another switching assembly for switching a second power supply. A dual power supply transfer switch including the switching mechanism also is provided.

An apparatus for an electrical switch that includes a rotor cam having a rotor interface, a handle interface, and a spring arm interface. The rotor interface includes a plurality of side interface features that couple the rotor cam to a rotor of the electrical switch so that rotation of the rotor cam causes rotation of the rotor. The handle interface allows coupling of the rotor cam to a handle, wherein the handle interface is sized so as to allow a predetermined amount of independent rotation of the handle relative to the rotor cam before further rotation of the handle causes rotation of the rotor cam. The spring arm interface couples a spring arm of the electrical switch to the rotor cam so that a bias spring of the spring arm biases the spring arm against the rotor cam. Numerous other embodiments are provided.

An apparatus for an electrical switch that includes a rotor cam having a rotor interface, a handle interface, and a spring arm interface. The rotor interface includes a plurality of side interface features that couple the rotor cam to a rotor of the electrical switch so that rotation of the rotor cam causes rotation of the rotor. The handle interface allows coupling of the rotor cam to a handle, wherein the handle interface is sized so as to allow a predetermined amount of independent rotation of the handle relative to the rotor cam before further rotation of the handle causes rotation of the rotor cam. The spring arm interface couples a spring arm of the electrical switch to the rotor cam so that a bias spring of the spring arm biases the spring arm against the rotor cam. Numerous other embodiments are provided.

A dual power automatic transfer switch mechanism, including: a switch housing; a first spring; a second spring; a first pin disposed on a first movable contact corresponding to a first power supply, the first spring acts between the first pin and the switch housing; and a second pin disposed on a second movable contact corresponding to a second power supply, the second spring acts between the second pin and the switch housing; a first driving disk is configured to actuate the first pin moves between a first power-on position and a first power-off position; a second driving disk is configured to actuate the second pin moves between a second power-on position and a second power-off position; wherein the first and second driving disk are configured to rotate synchronously such that the first and the second pin cannot in the power-on position at the same time.

A switch box mechanism of an enclosed switch assembly. The switch box mechanism includes a swivel catch having an elongated body, a pivot configured to allow the swivel catch to rotate relative to an enclosure, and a catch end including a catch configured to engage with an enclosure lid, and a slide feature formed in the elongated body, a rod configured to couple to a switch engagement member that is configured to engage with a rotor of a line base assembly, the rod having a slide portion slidably engaged with the slide feature, and a spring configured to bias the swivel catch. Enclosed switch assemblies and switch subassemblies including the switch box mechanism, and methods of operating enclosed switch assemblies are disclosed, as are other aspects.

An actuating apparatus having a signal transmitter and a mechanical operating element, wherein the mechanical operating element includes a first position that is stable over time and a second position that is stable over time, wherein the mechanical operating element, in the case of a movement from the first position that is stable over time into the second position that is stable over time, actuates the signal transmitter, and wherein the signal transmitter, upon actuation, causes a first signal change followed by a second signal change of an output signal, and an evaluation circuit detects an actuation of the mechanical operating element based on the first signal change and the second signal change.

An actuating apparatus having a signal transmitter and a mechanical operating element, wherein the mechanical operating element includes a first position that is stable over time and a second position that is stable over time, wherein the mechanical operating element, in the case of a movement from the first position that is stable over time into the second position that is stable over time, actuates the signal transmitter, and wherein the signal transmitter, upon actuation, causes a first signal change followed by a second signal change of an output signal, and an evaluation circuit detects an actuation of the mechanical operating element based on the first signal change and the second signal change.

A blocking member for an actuator having a movable arm for effecting a quick-make feature, includes, for example, an elongated member having a first end and a second end, wherein a portion of the elongated member is configured so that the blocking member disposed in a first position engages a portion of the movable arm of the actuator to restrain movement of the movable arm and so that the blocking member disposed in a second position disengages from the portion of the movable arm of the actuator to permit movement of the movable arm.

A blocking member for an actuator having a movable arm for effecting a quick-make feature, includes, for example, an elongated member having a first end and a second end, wherein a portion of the elongated member is configured so that the blocking member disposed in a first position engages a portion of the movable arm of the actuator to restrain movement of the movable arm and so that the blocking member disposed in a second position disengages from the portion of the movable arm of the actuator to permit movement of the movable arm.

An apparatus includes a switch having alternately open and closed conditions, and a shunt trip mechanism configured to detect and respond to an electrical fault condition. The apparatus further includes an operating mechanism including a spring assembly. The operating mechanism is actuatable manually to deflect the spring assembly into a stressed condition, and is actuatable automatically in response to the shunt trip mechanism to shift the switch into the open condition upon return deflection of the spring assembly from the stressed condition. The spring assembly may include springs connected in parallel.