Abstract: The following specification describes a magnetic assembly for use in controlling the main contacts of a circuit breaker. The magnetic assembly includes a yoke, an armature for attraction to the yoke to move an operating lever and a pivotable adjustment arm. The lever operates the trip crossbar, which opens the main contacts and is in turn pivotably carried by the adjustment arm. One end of the operating lever is held against longitudinal movement relative the trip crossbar, when the adjustment arm is pivoted to calibrate the circuit breaker. The lever therefore pivots on the adjustment arm to move the armature towards or from the yoke to control the armature air gap without altering the lever travel distance to the crossbar. The armature is also mounted on the lever for relatively linear movement in relationship to the yoke.

Abstract: In a magnetic puffer type gas circuit breaker including an electromagnetic coil through which a current to be interrupted flows during the breaking operation, and an electromagnetic repulsive member which produces an electromagnetic repulsive force in cooperation with the electromagnetic coil and drives movable parts of a breaking portion of the apparatus, the electromagnetic repulsive member is so arranged that the electromagnetic neutral position of the electromagnetic repulsive member within the electromagnetic coil at the time when the breaking portion has been closed deviates on the closing side with respect to the electromagnetic center of the electromagnetic coil.

Abstract: A circuit breaker includes a slotted magnetic device having a plurality of spaced slotted conductive plates and a moving contact arm positioned within the slot when the circuit breaker is in a closed circuit position so that current flowing through the contact arm has a component in a vertical direction with respect to the slot. An overcurrent condition through the circuit breaker causes magnetic flux to be generated within the slotted magnetic device which develops a force to drive the moving contact arm from the front to the rear of the slot in a direction generally parallel to the bottom of the slot, thereby actuating the circuit breaker from a closed circuit position to an open circuit position. The circuit breaker also includes an arc-extinguishing device including a plurality of apertured conductive plates. The moving contact arm includes a probe member extending into the apertures of the plates when the circuit breaker is in a closed circuit position.

Abstract: A relay has the contacts arranged in that two pairs of contacts on the armature are arranged so that the contacts of one pair extend at right angles, to the contacts of the other pair, but parallel to a hinge axis. Insulative partitions separate the contacts of the former pair individually from the contacts of the latter pair. Magnetic blower is provided for arc extinguishing.

Abstract: An arc barrier for a multi-pole relay switch in which the barrier is molded in a single piece having compartments for receiving each of the switch poles. The ends of the housing are clamped between parallel frame members having inwardly directed portions which engage the ends of the housing when it is inserted between the frame members. The walls extending between the clamped ends of the housing are provided with one or more open slots which permit the housing to be deformed slightly by the compressive force of the retaining frame members.

Abstract: The non-electric portion of the relay is constructed in two part configuration, one part being a coil carrier having a flange with wall structure covered by the other part, a head piece. The head piece has partitions to define arc chambers and carries one set of contacts and blowing magnets on the outside, the wall structure of the flange carries the other set of contacts and establishes internally the pivot path for the armature on the flange. The parts have indexing means for positioning and are bolted together.

Abstract: A molded case circuit breaker of relatively narrow width is afforded dramatically increased current interrupting capacity by providing shielding against the electromagnetic field developed as the result of short circuits flowing through a contiguous circuit breaker. Additionally, an arc runner is added to cooperate with an improved arc chute construction in controlling to extinction the arc developed incident to an interruption. The case is also vented to relieve the internal gas pressure during arcing.

Abstract: The present heavy duty automatic circuit breaker is compact in construction, since all elements are coordinated to each other in an efficient manner. Thus, an upper arc guide plate of a quenching stack is extended to form the stationary contact member. The movable contact member is a single arm pivot contact arranged directly in front of said quenching stack. A lower arc guide plate of the quenching stack is extended and electrically connected to the movable contact member. The circuit breaker includes means for either manual or automatic circuit breaking, the latter in response to overload and/or excess temperature conditions.

Abstract: A switching device includes a combination of a fixed contact, first and second electrically connected movable contacts, and an arrangement for moving the movable contacts so that the first movable contact closes to the fixed contact before the second movable contact closes to the fixed contact and so that the first movable contact opens from the fixed contact after the second movable contact opens therefrom.

Abstract: Disclosed is a molded case type magnetic circuit breaker having improved performance and an increased current rating. A corrosion and temperature resistant stainless steel wire screen having specific wire and mesh opening sizes overlies a novel exhaust gas baffle arrangement to cool and disperse arc chamber gases venting from the breaker. Flashover during high current switching, due to conduction through the exhaust gas plasma, is eliminated. Also disclosed is a novel arc chamber construction for the circuit breaker and a marine baffle for adapting the breaker to use in potentially explosive atmospheres.

Abstract: The present invention relates to a small electromagnetic relay comprising three independent sub-assemblies serving to fulfill respectively the function of motor, contact and connecting base and which can be assembled together.The contact sub-assembly is formed by an arcing box having recesses serving to receive the contact supports held in place between the base and the motor.The relay according to the present invention is applicable to automation and control circuits.

Abstract: A current limiting circuit breaker having for each pole, a pair of main contacts separable upon operation of a thermally and electromagnetically operable tripping device and a pair of auxiliary contacts for current limiting in series with the main contacts and in parallel with a transformable resistor having a positive temperature coefficient of resistance. The auxiliary contacts are separable when an electromagnet is energized by a fault current which simultaneously energizes a field magnet to produce a transverse magnetic field across the auxiliary contacts and the arc formed between them when separating. This simultaneous action of electromagnet and field magnet coacting for rapid contact separation and lengthening of the arc upon flow of a fault current serves to increase arc voltage almost instantaneously to that of the source, about which time the fault current is totally shunted into the resistor.

Abstract: A relay is constructed to have movable contacts on flat contact carriers extending e.g. from a swivel armature and moving in a space between corresponding flat yoke legs. The contacts on the carrier cooperate with fixed but resiliently mounted contacts. The carriers have permanent magnets to obtain magnetic blowing of any arc, and air flow around the carrier is confined to run transverse thereto also across the carrier contact surfaces. Both actions on the arc extend transverse to the direction of carrier movement upon relay actuation.

Abstract: A current limiting circuit breaker having for each pole, a pair of main contacts separable upon operation of a thermally and electromagnetically operable tripping device and a pair of auxiliary contacts for current limiting in series with the main contacts and in parallel with a transformable resistor having a positive temperature coefficient of resistance. The auxiliary contacts are separable when an electromagnet is energized by a fault current which simultaneously energizes a field magnet to produce a transverse magnetic field across the auxiliary contacts and the arc formed between them when separating. This simultaneous action of electromagnet and field magnet coacting for rapid contact separation and lengthening of the arc upon flow of a fault current serves to increase arc voltage almost instantaneously to that of the source, about which time the fault current is totally shunted into the resistor.