Abstract: A circuit configuration for a direct-voltage power pack of an electronically controlled switching device, particularly of a small programmable control system, which is externally supplied with voltage, having an arithmetic-logic unit, signal inputs and signal outputs. This circuit has a back-up supplier for the backup supply of the supply voltage and a detector for detecting the input voltage which is not backed up, the detector interacting with the arithmetic-logic unit in such a way that, in response to any voltage failure, the signal inputs are reliably prevented from being read in.

Abstract: A switching device has an openable contact arrangement including at least one movable contact member disposed on a movable contact arm and at least one stationary contact member. At least one movable braking body is provided for limiting the movement of the contact arm in opening the contact arrangement. The inertias of the contact arm with the movable contact member and the braking body are designed so that the contact arm is braked and the braking body is moved upon an impact of the contact arm with the braking body.

Abstract: An electromagnetic switching device, in particular a high capacity contactor, includes switch contacts which are arranged inside interrupter chambers formed by an interrupter chamber housing. Also provided is a deionizing device which is in the form of an arcing chamber and assigned to each interrupter chamber with a switch contact. The arcing chamber is formed by arcing plates which are assembled to form a packet. In addition, a cover is provided for closing the interrupter chambers on the upper side. The uppermost arcing plate which faces the cover is configured as a shielding plate of each arcing chamber and has at least one upward bent clip. Recesses which correspond with the clips of the arcing chambers are formed on the underside of the cover. The arcing chambers can be fastened to the cover to provide an interlocking connection by plugging the clips into the recesses.

Abstract: A rotation activated circuit breaker with a leading auxiliary switch, in which the auxiliary contacts of the auxiliary switch are actuated before the main contacts. An actuator element is provided, which contains a drive pinion that is rotation actuated by an actuating mechanism and a longitudinally movable first gear rack, which engages with the drive pinion and actuates the auxiliary switch. Furthermore, a second gear rack, which lags behind the first gear rack in the closing direction, and an output pinion, assigned to the second gear rack, which is connected to a drive shaft for the breaking mechanism of the circuit breaker, are provided. The tooth pitch of the output pinion and the second gear rack is greater than the tooth pitch of the drive pinion and the first gear rack so that the total rotation angle of the drive pinion and output pinion is the same over the full closing motion of the actuating mechanism.

Abstract: An electromagnetic switching device (2) with restricted guidance, in which the closure contacts do not come into contact when the break contact is welded or fixed. An elastically resilient transmission lever (10) is provided to establish the effective connection between the armature (8) and the contact support (12) extending at a distance from and parallel to the armature.

Abstract: A arcing chamber housing is disclosed for a circuit breaker with a double turning contact breaker. The arcing chamber housing (1) is composed of two housing modules (2, 3) and an extinguishing chamber (19) is arranged in the area of the fixed contact pieces (6, 7) to extinguish the arcs which are formed between the contact pieces of the double turning contact breaker. In order to obtain a arcing chamber housing (1) which is easy and economical to produce, with extinguishing chambers (19) which have a reproducible extinguishing behavior once the arcing chamber is assembled, the two housing modules (2, 3) are substantially L-shaped parts whose inner marginal surfaces (4, 5) face each other. The first parts (17, 18) of the housing, which correspond to the first branches of the L-shaped housing modules (2,3), are designed as extinguishing chambers (19). Also disclosed are the housing modules (2, 3) used to produce such a arcing chamber housing.

Abstract: In a circuit breaker utilizing a toggle link mechanism, the reset operation is facilitated. A block link including a reset pin, a first hole and a second hole is provided. The reset pin is inserted into a circular arc shape third hole formed concentric with the rotation of a trip lever formed at a secured frame. An actuating pin of a handle lever is inserted into the first hole. A shaft provided at a movable contact holder is inserted into the second hole. By this mechanism, the friction in the reset operation can be reduced to allow the reset operation to be perform by a smaller force. As a result, an auxiliary handle is not required. The handle and electrical operation devices can be reduced in size. Also, the operating handle is prevented from moving to the OFF position when the switching contacts are welded.

Abstract: A trip device of a main circuit breaker is provided which causes only a branch circuit breaker to be set into a tripped state when an abnormal current occurs at a load of the branch circuit breaker while keeping a closed state of the main circuit breaker. The trip device of the circuit breaker has a structure including a trip latch mechanism for opening switching contacts, a stationary core, a movable core which is attracted to the stationary core to release the latch mechanism of a trip lever, an operating pin for interrupting movement of the movable core while the movable core is attracted, an operating spring charged with force when the movable core is attracted, and an inertia roller holding the operating pin, kicked when the operating spring discharges the force, and moved to a position which does not interrupt movement of the movable core. Accordingly, this structure allows a selective tripping system to be implemented simply with small size and low cost.

Abstract: A locking-type actuator for a rotary switch, in which a base plate (8) is slid over the actuating shaft (18) of the rotary switch (2) and secured to the rotary switch housing (6). A twist handle (10) secured so as to be torsionally fixed to the actuating shaft (18) is provided with at least one locking opening (32) for shackle connectors to be inserted. Displaceably supported in the twist handle (10) in a direction perpendicular to the actuating shaft axis (36) is a stopper (34), which is able to be externally manipulated to block or release the locking opening (32), and displaceably supported in the twist handle (10) parallel to the actuating shaft axis, is a locking pin (48), which is able to be actuated against a spring resilience.

Abstract: A multi-range power supply unit with an automatic switchover between ranges for different power supply voltages is disclosed for use with devices such as circuit breakers or contact systems. The power supply unit preferably has only two input connections for an input voltage range of approximately 20V-230V. Between the two input connections there is a rectifier circuit with a voltage stabilizing element, such as a Z-diode or equivalent device, connected in parallel. Connected in series to the rectifier circuit is a current divider. The current divider includes a capacitance and a thermistor. The thermistor preferably has a positive temperature coefficient (PTC). The power supply unit can be used for a power supply with DC voltage and for a power supply with AC voltage.

Abstract: An electric power distribution switching device including a detector for detecting accidental arcs in the electric power distribution switching device, which detector includes at least one waveguide in which the light generated by the arc and reaching it via its casing is used as a triggering or warning criterion. The detector can include a support rod, a waveguide wound helically around the support rod, and two plug connectors fitted at the ends of the support rod. The detector also includes a heat-shrink sleeve which is permeable to light and UV radiation. The heat-shrink sleeve is fitted over the support rod, the waveguide and the plug connectors. A detector configured in this manner can prevent damage to the detector during installation or fitting in the switching equipment.

Abstract: The present invention relates to a switch latch for a power switch comprising a switching gate, two toggle levers which are connected by means of a toggle-lever axle, a helical latch spring and a release lever allowing the control of the change-over point, and thus the control of the release of the switching shaft.

Abstract: Guide members to guide the guide edges of plug-in units upon insertion of the plug-in units into the U-shaped bus duct of a low voltage switchgear assembly. The guide fittings are arranged on the inside of the side legs of the U-shaped bus duct, and the plug-in units are held between the side legs of the bus duct. Each of the guide members extends from and is made of the same material continuous with its corresponding side wall of the bus duct.

Abstract: A switch has at least one fixed and one moving contact located on a contact arm. The fixed contact is connected to a loop-shaped conductor segment, such that when current flows through the conductor segment, there is an electrodynamic magnetic force which acts on the contact arm. The force, above a specified current intensity, results in an opening movement of the contact arm. To open the moving contact more rapidly and in a simple manner the loop-shaped conductor segment is realized so that it is wound in a coil shape, and consists of at least two turns, and that the coil axis of the coil segment runs perpendicular to the longitudinal axis of the contact arm.

Abstract: An electrical switch is intended to prevent hot arc gases from contacting the terminal screw units. The arc gases are to flow off in an already deionized manner so that no damage is caused even when they flow out towards the electric cable terminals without the need for additional shielding for the terminals. A terminal cover section is designed with blow-out channels which are fully encapsulated with respect to the terminal screws and to the terminal chambers and have an outlet aperture each. To fully encapsulate and provide access to each of the terminal screws, a location dome passes through each blow-out channel. At the points where the through apertures join the quench chambers, the inserted terminal cover section is sealed against the separating wall of the housing in the region of the blow-out channel inlet apertures. The arc gases flow from arc quenching chambers through a partition by way of passage openings.

Abstract: In order to make it easier to wire controls or switch cupboards and to economically reduce the probability of wiring errors, the ready-for-use cable is tied to a sequence of interconnected cables. In order to produce the sequence of ready-for-use cables, their insulation is stripped off between the cables, the cables are soldered by ultrasonic waves and notched. The cable sequence matches the wiring sequence of an apparatus to be later wired. In addition, the insulation is designed as a collar or bead at the ends of the cables.