There is provided a drive lever incorrect assembly detection portion (9d) and (14) which causes another end portion (9a) of a drive lever (9) to protrude to a position, of a case (4), to which a cover (5) is attached such that the cover (5) cannot be attached to the case (4) in a state where the drive lever (9) is assembled in an incorrect direction.

An electromagnetic contactor 1a is provided with an erroneous mounting prevention unit 8 which permits an entry of a connection piece when a connection piece 6f of a reversible unit 6 attempts to enter a normal position NP inside a display window 3a where the connection piece is connectable to an operation display piece 4a, and restricts the entry of the connection piece when the connection piece attempts to enter a position inside the display window 3a deviated from the normal position NP.

A contact assembly comprising a plurality of pairs of spaced apart fixed contacts supported in an electrically insulating body, an actuator displaceable relative to the body between first and second positions, and a plurality of moveable contacts mounted on the actuator. Each moveable contact is positioned on the actuator so as to interconnect the contacts of one of the pairs of fixed contacts only when the actuator is in one of the first and second positions. Each fixed contact has two limbs defining an L-shape, one limb defining a single leg which extends through an aperture formed in a partition defined by the body and the other limb extending to one side of the leg to define a head supporting a terminal for gripping a wire. Each moveable contact is displaceable into contact with the leg of each of the respective pairs of fixed contacts on the side of the leg from which the head extends and on the side of the partition remote from the head.

This concerns a molded case circuit breaker having separable main contacts and an operating mechanism utilized to cause the separable main contacts to open and close. A trip unit is provided to actuate the operating mechanism in desirable circumstances. The circuit breaker has external terminals which are connectable with an external load and an external power supply. A collar is used to interconnect the circuit breaker terminals with the load and power supply. The terminal collar in this case is non- symmetrical. The non-symmetrical collar provides two functions: the first function is that the path of electrical continently between adjacent collars is enlarged for higher voltage applications because of the non-symmetrical nature of each collar; secondly, the circuit breaker case has a seat therein which has the same cross-section as the non-symmetrical collar, so that the collar can only be inserted therein in one cross-sectional orientation.

L'invention est relative à un disjoncteur basse tension équipé d'un déclencheur statique. Le déclencheur statique constitue un sous-ensemble (26) amovible logé dans un compartiment (24) séparé de la partie restante de l'enceinte du boîtier moulé (10) du disjoncteur par une cloison étanche (46). Les parois externes du compartiment (24) comportent des orifices (52) de ventilation évitant tout échauffement du dispositif électronique du déclencheur statique. Les transformateurs de courant (22) sont solidaires du socle (12) du boîtier mouié (10) et sont reliés par des conducteurs à raccord rapide (60, 62) au déclencheur statique amovible (26). Les raccords rapides (60, 62) assurent la double fonction de court-circuitage et de détrompage.