Electronic Overload Relay

Abstract

The invention relates to an electronic-type overload relay with reliable action, comprising a support, a U-shaped iron core, another two permanent magnets, a permanent seat and two coils, wherein two permanent magnets are arranged in frameworks at the end parts of support arms at the two sides of the support respectively, each coil is provided with two windings, both the left and the right of the permanent seat are respectively provided with a framework, the another two permanent magnets are arranged in the frameworks respectively, the permanent seat is fixedly connected with the support, and the end parts of two side arms of the iron core are arranged between the frameworks of the support and the frameworks of the permanent seat, and the two coils are arranged on the two side arms respectively. According to the electronic-type overload relay, due to the adoption of the four permanent magnets and the two dual-winding coils which are in the structure of two bilaterally symmetrical groups, so that the releasing magnetic force and the resetting magnetic force are two times those of the conventional structure, and the acting force is symmetric, so that the action reliability is improved; and sincethe iron core is attracted through two bilaterally symmetrical permanent magnets when a switching mechanismis positioned in a static state, the attraction force is increased by two times, the auxiliary contact spring final pressure matched with the attraction force is also increased, and accordingly, the contact breakover reliability is improved.

Description

technical field [0001] The invention belongs to a control electric appliance, in particular to an electronic overload relay. Background technique [0002] In the currently known TR40 series electronic overload relay tripping and reset conversion mechanism, because the tripping action uses a single coil on one arm of the U-shaped iron core and the magnetic force generated by the iron core at the end of the side arm and a single permanent The magnet interacts to realize the tripping, while the reset action adopts the magnetic force generated by the single coil and iron core on the other side of the symmetry to interact with another permanent magnet to realize the reset, because the magnetic force generated by the single magnetic field is insufficient, resulting in tripping and The reset action is unreliable, and when the conversion mechanism is in a static state, a single permanent magnet is used to attract the iron core. The insufficient suction force also leads to a small fi...

AI Technical Summary

Problems solved by technology

[0002] In the currently known TR40 series electronic overload relay tripping and reset conversion mechanism, because the tripping action uses a single coil on one arm of the U-shaped iron core and the magnetic force generated by the iron core at the end of the side arm and a single permanent The magnet interacts to realize the tripping, while the reset action adopts the magnetic force generated by the single coil and iron core on the other side of the symmetry to interact with another permanent magnet to realize the reset, because the magnetic force generated by the single magnetic field is insufficient, resulting in tripping and The reset action is unreliable, and when the conversion mechanism is in a static state, a single permanent magnet is used to attract the iron core. The insufficient suction force also leads to a small final pressure of the auxiliary contact spring that cooperates with this force, resulting in unreliable contact conduction.

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