摘要:
Embodiments of a data rack assembly for an electrical panel are provided. The electrical panel comprises a housing with a panelboard operatively connected to a live panel bus for distributing power to electrical components within the electrical panel. The electrical panel further includes a data rack assembly comprised of a lower bracket attached to an upper bracket. The lower bracket includes a pair of side walls defining a channel therebetween for accommodating and arranging one or more electrical wires, while the upper bracket includes a pair of support members for attaching the data assembly to the panelboard. A data carriage comprising slots for inserting data modules is also provided and attached to the upper bracket for creating monitoring points within the electrical panel. By arranging the electrical wires in the channel, additional space is available for installing additional data rack assemblies, thereby providing additional monitoring points.
摘要:
A molded case circuit breaker is provided with a quick change current transformer assembly. The current transformer is used to sense overcurrent conditions and apply a signal to an electronic trip unit to trip the circuit breaker. The quick change assembly includes an insulated removable plate located adjacent an open cavity in the housing in which the current transformer is located. The current transformer is donut-type disposed about a load-side conductor located in a cavity in the housing rigidly fastened to the circuit breaker frame. In order to replace a current transformer, the insulated backplate is removed. Next the load-side conductor is unfastened and removed from the circuit breaker housing. The current transformer is then removed from the circuit breaker housing. In order to install a new current transformer, the steps are reversed. A force transmitting spacer is disposed adjacent a bight portion of a shunt, connected between a pivotally mounted contact arm and a load-side conductor. The force transmitting spacer transmits magnetic repulsion forces generated between the load-side conductor and the depending leg of the shunt adjacent the load-side conductor to the other depending leg of the shunt. By disposing the force transmitting spacer into the bight portion of the shunt the compression action required between the depending legs of the shunt is eliminated or reduced, thus reducing the blow open time significantly.
摘要:
A circuit breaker is provided with at least one switching arrangement having a mobile contact and a retractable contact, this latter being supported by a pivoting lever; a tripping mechanism for causing the rapid opening of the mobile contact, an electromagnetic actuator having an element movable in translation under the effect of a control signal applied to the actuator and a mechanical coupling for transmitting the movement of the mobile element to the retractable contact, wherein the mechanical coupling is rigid and moves in translation according to a translation plane parallel to the movement of the mobile element and it is coupled to said pivoting lever at a point offset with respect to the plane of translation.
摘要:
It is the main object of this invention to provide a circuit breaker in which the movable contacts have sufficient opening force and opening distance, and in which the breaking time is short. In order to attain the object, the circuit breaker of this invention is provided with a dead center link mechanism comprising a movable contact link which is rotatably supported by the arms of a cross bar which is operated so as to be capable of opening-closing the circuit and tripping by means of a trip-free mechanism, and a toggle spring which is bridged between the cross bar and the movable contact link. When a large current such as a short-circuit current flows, a movable steel plate attracted by an electromagnet for instantaneously tripping hits a rod for supporting the movable contacts which is connected to the movable contact link, whereby the dead center link mechanism makes the movable contacts open at high speed from the fixed contacts. As a result of such an operation, the current-limiting effect in this circuit breaker is excellent and breaking performance is improved.
摘要:
A magnetically operated circuit breaker characterized by a circuit breaker structure including first and second separable contacts operable between open and closed positions, a releasable mechanism movable when released to a tripped position to effect automatic opening of the contacts, the first contact being connected to the releasable mechanism, the second contact being movable between open and closed positions of the first contact, and electromagnetic actuating means for moving the second contact between open and closed position in response to a control signal generated remotely from the circuit breaker.
摘要:
A four-pole circuit breaker has an operating mechanism associated with one of the intermediate main poles, so as to take up an asymmetrical position with respect to the layout of the four poles. The mechanism has springs similar to those of a three-pole breaker. The transverse tie bar is common to the three main poles and is mechanically coupled to a kinetic linkage controlling the fourth pole, so as to bring about the closure of the contacts of the fourth pole before the closure of the contacts of the main poles upon closing of the breaker, in order to match the four-pole load torque to the three-pole motor torque of the mechanism.
摘要:
A circuit breaker comprises an adjustable trip unit having electronic circuitry for initiating a tripping command upon detection of overcurrent conditions. The trip unit includes an externally accessible interchangeable plug-in rating adjuster removably supported on the housing of the circuit breaker by a threaded rod and tube. An interlock mechanism cooperates with the trip bar of the circuit breaker and secured mechanism to insure that only when a compatible rating adjuster is properly seated in the housing and the threaded rod is completely engaged within the threaded tube will the circuit breaker mechanism be removed from the trip-free condition. Coordination of a proper rating adjuster with a corresponding trip unit and circuit breaker is achieved by coordinating the lengths of the rod and tube and the position of the threaded portions thereof such that only a rating adjuster which is electrically compatible with a particular circuit breaker and trip unit will properly engage the threads of the tube to remove the circuit breaker from the trip-free condition.
摘要:
A multi-pole circuit breaker is provided with a molded insulating housing defining an internal chamber wherein the mechanical trip free contact operating mechanism is disposed, an external recess wherein an auxiliary switch unit is removably mounted, and an external cavity wherein a shunt trip assembly is removably mounted. The switch unit includes one switch operable by the mechanism as it opens and closes the circuit breaker contacts and a second switch operated by the latchable cradle of the mechanism to indicate automatic tripping. The shunt trip assembly includes an electromagnet having an operating member which engages the cradle latch to release the latter.
摘要:
A multi-pole circuit breaker is provided with a trip bar subassembly including a molded bar having integrally formed bearings defining a pivot axis for the subassembly remote from the bar. The bar also includes an integrally formed projection for releasing a latch of a trip free contact operating mechanism. The subassembly also includes an extension unit of formed sheet metal and an elongated pin pivotally connecting the unit to the bar. The unit includes an elongated main section and links individually connected to overload sensing devices of each pole. The links are spaced along the length of the main section extending transverse to the longitudinal axis thereof with the latter being generally parallel to the pin.
摘要:
A unitized combination motor starter is provided with a single insulated housing wherein a plurality of pole units are disposed in side-by-side relationship. The pole units are electrically connected in series with an electromagnetic contactor disposed within the insulated housing and located at one end of the pole units. A spring powered contact operating mechanism for the pole units is disposed on one side of the pole units. An overload sensing electromagnet coil, provided for each of the pole units, is positioned for removal and replacement after opening the front cover of the insulated housing.