Abstract: Self-coordinated device for the control and protection of electric motors and electrical equipment, for example, comprising, in a housing (2), a single control solenoid (5), a magnetothermal release device (M), a movable main contact (4) with a double break for each phase, which main contacts (4) are mounted on a contact-carrying bar (25) which is slidable and elastically preloaded (31), with which there interacts a composite mechanism (A) for the control of circuit-opening comprising two interacting mechanisms (B; C). One mechanism (B) interacts with the control solenoid (5) for desired circuit openings and for current surges. Both mechanisms (B; C) cause circuit-opening when short-circuit currents occur, more precisely with a double pushing action on the contact-carrying bar (25). The mechanism (C) also interacts with a locking mechanism (D) interacting in turn with a control knob (3) for the manual opening of the main contacts (4).

Abstract: The present invention relates to a stationary contact for a low-voltage circuit breaker constituted by a contact holder element having a shaped slot and by a contact element fastened to the contact holder nearby the slot in order to generally improve the features of a low-voltage circuit breaker.

Abstract: In a current-limiter electric switch having fixed contacts, movable contacts, remote control means active upon the movable-contact-carrier against spring bias, thermomagnetic protection means being also provided, the remote control means is a solenoid the core of which is directly connected to the movable-contact-carrier and in the excitation circuit of the solenoid contacts are provided, which are opened when controlled by the thermomagnetic protection devices to have the solenoid dropped in the case of overcurrents which cause said protection devices to enter action.

Abstract: A plug-in electric switch which includes a mobile unit and a fixed unit, the fixed unit having a recess and a spring biased sliding plate, the mobile unit including a contact arm and main contacts, secondary contacts carried by both the mobile and the fixed units, a rod slidably mounted relative to and carried by the mobile unit, the rod having an end with an inclined face adapted to contact an inclined face of a slidably mounted latch, spring biasing the latch in a direction to maintain the faces in sliding contact, and another spring normally biasing the rod in a direction toward the contact or support arm such that when the main contacts are closed the mobile and fixed units are prevented from being disengaged or re-engaged and at a partially engaged position the main contacts cannot be closed.

Abstract: An electric switch including fixed and movable contacts, the movable contact being carried by a pivoted arm movable between a first position at which the fixed and movable contacts are in closed contacting relationship and a second position at which the fixed and movable contacts are in open noncontacting relationship, a control lever, a pivot mounting the control lever for movement between first and second positions thereof corresponding to the closed and opened positions respectively of the contacts, a toggle linkage including a plurality of links operatively interconnected between the arm and the control lever, a spring connected between the toggle linkage and the control lever for moving the arm from the first position thereof to the second position thereof and vice versa upon movement of the control lever respectively from the first to the second positions thereof and vice versa absent the contacts being welded together in the closed position thereof, the links being disposed generally in-line in the clo

Abstract: An electric switch assembly is split into two mating units one of which contains the mechanical control component parts, the accessories and display means, the other unit containing the fixed contacts and the tripping means for the switch. Further seats can be provided to make arc-quenching chambers.

Abstract: An electric switch, more particularly a current-limiter, to be actuated by a control pin which indicates the OFF or the ON condition, and which can be opened also by the agency of thermomagnetic tripping mechanisms and by means of a coil. A crank lever is linked to a swinging assembly which is rockably mounted about the pin and to a rocker carrying the rod to actuate the movable contacts. The lever, to be able to permit that the contacts may be closed, must rest on a step of another lever and this resting relationship can be undone either by acting upon the pin, or by means of the tripping mechanisms and the coil. The opening by means of the tripping mechanisms takes place with a kind of "stroke trip" action, the mechanism being automatically reset during opening. The action of the tripping mechanisms is visually displayed and the reclosure of such a switch can be caused dependent from a local intervention by means of a pushbutton.

Abstract: An electric switch is disclosed in which the swingable arms intended to approach and separate the fixed and movable contacts are a part of a linkage containing fixed and slidable pins, so that an overcurrent exceeding a preselected limit causes the contacts to be opened without rebounds. The existing, or specially provided clearances between the component parts of the linkage are exploited for providing yieldable end of stroke abutments for absorbing the shock of the contact-carrying arm.