Abstract: The invention relates to an assembly device by screwing with tightening torque limiting, comprising a screw provided with a screw head and with a threaded shank defining a geometric reference axis, a sectile monoblock tightening end-piece provided with a tightening head having a tightening profile, with a coupling profile to operate in conjunction with the screw head and with a breaking zone. An insulating sleeve is molded onto the tightening end-piece and the screw head. The sleeve is provided with first coupling means to secure the tightening head and the coupling profile and with second coupling means to secure the screw head and the coupling profile. Said second coupling means comprise a first portion securedly fixed in rotation to the tightening head, a second portion securedly fixed in rotation to the screw head, and a sectile third intermediate portion.

Abstract: A blade assembly for use in a circuit breaker, the blade assembly comprising a plurality of blades, including one or more pairs of adjacent side-by-side blades having coplanar contact surfaces and coplanar bearing surfaces, at least one set of blade springs, each having one end in operative contact with the bearing surface of each of a pair of adjacent side-by-side blades, the at least one set of blade springs comprising at least one compression spring.

Abstract: A blade assembly for use in a circuit breaker, the blade assembly comprising a plurality of blades, including one or more pairs of adjacent side-by-side blades having coplanar contact surfaces and coplanar bearing surfaces, at least one set of blade springs, each having one end in operative contact with the bearing surface of each of a pair of adjacent side-by-side blades, the at least one set of blade springs comprising at least one compression spring.

Abstract: An electrical circuit breaker pole comprises a stationary contact means, a movable contact means, and an arc extinguishing chamber comprising two side flanges, separators, a front opening situated near to the contact zone of the stationary contact means, a lower arcing horn, an upper arcing horn and a pair of lateral dielectric shields laterally limiting the front opening of the chamber. Each lateral dielectric shield is arranged in such a way as to be interposed laterally between the separators and the movable contact means in the open position. The pair of lateral dielectric shields is arranged in such a way that the width of the opening of the chamber is appreciably smaller near to the upper arcing horn than pear to the lower arcing horn.

Abstract: An electrical circuit breaker pole comprises a stationary contact means, a movable contact means, and an arc extinguishing chamber comprising two side flanges, separators, a front opening situated near to the contact zone of the stationary contact means, a lower arcing horn, an upper arcing horn and a pair of lateral dielectric shields laterally limiting the front opening of the chamber. Each lateral dielectric shield is arranged in such a way as to be interposed laterally between the separators and the movable contact means in the open position. The pair of lateral dielectric shields is arranged in such a way that the width of the opening of the chamber is appreciably smaller near to the upper arcing horn than near to the lower arcing horn.