A mechanical interlock for a switch gear switch. The mechanical interlock includes a base and a slider. The slider is moveable relative to the base between a first position and a second position. The mechanical interlock is configured to lock the position of the switch when the slider is in the second position.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A current detecting element, a tripping mechanism, and control circuitry are provided to move the switchable contact to an open position in response to predetermined electrical current conditions in the device.

A latch system for an electrical equipment enclosure includes a latch arm receiver adapted to be connected to an associated enclosure door. A latch arm assembly is adapted to be connected in operative engagement with an associated circuit breaker. The latch arm assembly includes a chassis and a latch arm that moves relative to the chassis between: (i) a first arm position; (ii) a second arm position; and (iii) an intermediate arm position between the first arm position and the second arm position. A latch arm spring biases the latch arm toward its first arm position. A handle is rotatably connected to the chassis and operatively connected to the toggle of the circuit breaker. The handle is movable to and between an ON handle position, a TRIP handle position, an OFF handle position, and a RESET handle position. The handle is operatively connected to the latch arm such that the latch arm is positioned in the second arm position when the handle is located in said RESET handle position. The latch arm spring biases the latch arm into one of the first position and the intermediate position when the handle is in any one of said ON handle position, said TRIP handle position, and said OFF handle position. A lockout plunger is connected to the handle to rotate with the handle and is movable between a disengaged position and an engaged position, wherein the lockout plunger prevents movement of the handle from the OFF handle position to the ON handle position when the lockout plunger is in its engaged position

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism including an electromagnetic coil is operable to move the switchable contact to an open position in response to a predetermined electrical condition when the fuse is engaged and when the switchable contact is in the closed position.

An electrical system includes an enclosure for housing an electrical device that is capable of being turned on and off. The enclosure includes a door with an operating handle that, when the door is closed, can be used to turn the electrical device on or off. The operating handle is further operable to displace an interlock mechanism for engagement or disengagement to a busway structure and indicate a status of the electrical device as on, off, or tripped.

The construction comprises a rotary handle with a first pivot axis, a locking latch with a second pivot axis, a fixed bottom ring, a locking pin movable with the locking latch between a first position in which the rotary handle can be turned in relation to the bottom ring and a second position in which the locking pin prevents turning of the rotary handle in relation to the bottom ring, a shaft adapter rotationally movable against a spring force in relation to the rotary handle. The shaft adapter comprises a protrusion having a locking member which locks the locking pin into the first position when the torsional moment acting on the rotary handle exceeds the spring force acting on the shaft adapter causing a limited rotational movement of the shaft adapter in relation to the rotary handle.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism and control circuitry are provided to move the switchable contact to an open position in response to a predetermined electrical condition.

In a rocker arm of an electric switch, the electric switch is actuated by the rocker arm for setting definable positions. The rocker arm of an embodiment includes a first part, for setting the definable positions, and a second part, movable between a first position and a second position. In the first position of the second part, the first part can be moved into the definable positions; and in the second position of the second part, the movement of the first part is blocked.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism and control circuitry are provided to move the switchable contact to an open position in response to a predetermined electrical condition.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism and control circuitry are provided to move the switchable contact to an open position in response to a predetermined electrical condition.