Protective device
First Claim
Patent Images
1. A protective device for preventing overcurrent and overvoltage comprising:
- a base substrate, a first and a second pair of electrodes formed on the base substrate, a low-melting metal element connected between the first pair of electrodes to interrupt the current flowing between the electrodes by fusion, a heating element connected between the second pair of electrodes wherein the heating element is in thermal communication with the low-melting point metal element in parallel circuit to heat and cause the low-melting point metal element to fuse when the overcurrent or overvoltage occurs, spacer members provided in contact with the first and second pair of electrodes respectively, and an insulating cover plate opposed to the base substrate on the side of the base substrate having the electrodes and fixed at an aligned position in contact with the spacer member.
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Abstract
Protective devices for preventing overcurrent and overvoltage are disclosed. The devices includes a base substrate, a pair of electrodes formed on the base substrate, and a low-melting metal element connected between the pair of electrodes to interrupt the current flowing between the electrodes by fusion. An insulating cover plate is positioned and fixed in contact with the pair of electrodes serving as a spacer member.
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Citations
9 Claims
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1. A protective device for preventing overcurrent and overvoltage comprising:
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a base substrate, a first and a second pair of electrodes formed on the base substrate, a low-melting metal element connected between the first pair of electrodes to interrupt the current flowing between the electrodes by fusion, a heating element connected between the second pair of electrodes wherein the heating element is in thermal communication with the low-melting point metal element in parallel circuit to heat and cause the low-melting point metal element to fuse when the overcurrent or overvoltage occurs, spacer members provided in contact with the first and second pair of electrodes respectively, and an insulating cover plate opposed to the base substrate on the side of the base substrate having the electrodes and fixed at an aligned position in contact with the spacer member. - View Dependent Claims (2, 3, 4, 5)
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6. A protective device for preventing overcurrent and overvoltage comprising:
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a base substrate, a fist and a second pair of electrodes formed on the base substrate, a low-melting metal element connected between the first pair of electrodes to interrupt the current flowing between the electrodes by fusion, a heating element connected between the second pair of electrodes wherein the heating element is in thermal communication with the low-melting point metal element in parallel circuit to heat and cause the low-melting point metal element to fuse when the overcurrent or overvoltage occurs, and an insulating cover plate opposed to the base substrate on the side of the base substrate having the electrodes, wherein the insulating cover plate is fixed on the base substrate at an aligned position via a spacer member formed on the insulating cover plate. - View Dependent Claims (7, 8, 9)
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Specification