Miniature circuit breaker pole

Abstract

A single-pole miniature circuit breaker, comprising:-- a casing on which there are two terminals for connection, in input and in output from the circuit breaker, to a phase of a low-voltage electric circuit, said casing having a front wall from which an actuation lever protrudes, a rear wall for coupling to a supporting element, two side walls that are substantially mutually parallel and whose distance is equal to a base module M, an upper wall and a lower wall, inside the casing there being provided:--fixed and moving contact means that can be mutually separated in order to interrupt the flow of current in said phase;-- a kinematic mechanism that is operatively connected to said actuation lever and is suitable to move said moving contact means;--electric are quenching means;--a device for protection against short-circuits, which comprises a coil and a moving striker suitable to interact operatively with said kinematic mechanism;-- a device for protection against overloads, which comprises a heat-sensitive element that is suitable to interact operatively with the kinematic mechanism; characterized in that said fixed and moving contact means comprise a first pair of contacts, having a first fixed contact and a first moving contact, and a second pair of contacts, having a second fixed contact and a second moving contact, a first arc quenching chamber and a second arc quenching chamber being respectively associated with said first and second pairs of contacts, said first and second pairs of contacts being electrically series-connected to each other and being crossed by currents that have the same direction.

Description

technical field [0001] The present invention relates to a miniature circuit breaker pole for low voltage applications, ie operating voltages up to 1000 volts. Background technique [0002] It is known that low voltage electrical systems use suitable protective devices, generally referred to in the art as modular circuit breakers or miniature circuit breakers. [0003] These circuit breakers are dimensionally characterized in that, depending on the number of poles used, the width of these circuit breakers is equal to the width of a standard module or is a multiple of the width of a standard module, as stated in the relevant international standards, and these circuit breakers pass through It is normally used mounted on a suitable support element, such as a DIN rail, which in turn is usually placed in a suitably arranged electrical enclosure. [0004] One of the main requirements for a modular circuit breaker of the residual current or magnetothermal type is the ability to ens...

AI Technical Summary

Problems solved by technology

[0006] At present, in known types of miniature circuit breakers, on the one hand such solution in which the breaking capacity is increased by increasing the size of the components used and by adopting a specially constructed structure, thus increasing the width of the circuit breaker relative to the width of the standard basic module, and on the other hand , keep this standard width, but buy a circuit breaker with reduced breaking capacity

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