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Anti-surge structure built in switches

  • US 10,446,300 B2
  • Filed: 08/22/2017
  • Issued: 10/15/2019
  • Est. Priority Date: 08/22/2017
  • Status: Active Grant
First Claim
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1. An anti-surge structure built in switches, comprising:

  • a housing;

    a first metal-oxide varistor, a second metal-oxide varistor, a third metal-oxide varistor, each having a first surface at a side thereof and a second surface at an opposite side thereof, said metal-oxide varistors partially overlapped in stair-like arrangement, the first surface of the first metal-oxide varistor and the second surface of the third metal-oxide varistor being left completely exposed, the second surface of the first metal-oxide varistor partially overlapped with the second surface of the second metal-oxide varistor with a first conductive element disposed in-between for electrical connection, the first surface of the second metal-oxide varistor partially overlapped with the first surface of the third metal-oxide varistor with a second conductive element disposed in-between for electrical connection;

    an insulating body including a first part and a second part assembled for the metal-oxide varistors to be disposed therein, the first part having a first open section and a third open section and the second part having a second open section and a fourth open section for externally electrical connection of the metal-oxide varistors;

    an insulating band surrounding a periphery of the second metal-oxide varistor and having a thickness greater than a thickness of the second metal-oxide varistor to fill in spaces between the stair-like metal-oxide varistors and the insulating body, protecting the metal-oxide varistors from external impacts and defining four isolated insulating areas around the metal-oxide varistors;

    a spring element having a fixed section and a springy free end;

    a pushing element having a lower section abutting correspondingly on a bimetal plate and an upper surface compressing the spring element under a bottom of the second part of the insulating body for the spring element to be resiliently displaceable;

    a strap disposed under the pushing element and having a first end passing through the first open section and welded to a connecting area of the first surface of the third metal-oxide varistor by low-temperature solder paste, and a second end passing through the second open section and welded to a connecting area of the first surface of the second metal-oxide varistor, so as to fix a position of the pushing element under the second part of the insulating body;

    a fourth contact piece having an elastic section at a top thereof, the elastic section including a free end passing through the third open section of the first part of the insulating body and being welded on the first surface of the first metal-oxide varistor by low-temperature solder paste;

    whereby when an overvoltage occurs, temperature of the second and third metal-oxide varistors rises up instantly to a degree that is higher than a melting point of the low-temperature solder pastes, loosening the strap, releasing the free end of the spring element to displace the pushing element and thereby breaking a electrical circuit thereof;

    or when an overvoltage occurs, temperature of the first metal-oxide varistor rises up instantly to a degree that is higher than a melting point of the low-temperature solder pastes, releasing the elastic section and thereby breaking a electrical circuit thereof.

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