Protective device

Patent metadata

Field	Value
Publication number	US-9923362-B2
Application number	US-201214369134-A
Country	US
Kind code	B2
Filing date	Dec 17, 2012
Priority date	Dec 27, 2011
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

The present invention provides a protection device which includes a PTC component and a first non-resettable contact component which is connected electrically in parallel to the PTC component. A second non-resettable contact component is connected electrically in series to the PTC component, and when the PTC component is tripped by a current which is diverted by opening the contact of the first non-resettable contact component, the contact of the second non-resettable contact component opens due to heat which is generated by the PTC component.

First claim

What is claimed is:

1. A protection device comprising:
a PTC component;
a first non-resettable contact component connected electrically in parallel to the PTC component; and
a second non-resettable contact component connected electrically in series to the PTC component, the second non-resettable contact component being close to or in contact with the PTC component and independent of heat influence of the first non-resettable contact component;
wherein when the PTC component is tripped by a current which is diverted by opening the contact of the first non-resettable contact component, the contact of the second non-resettable contact component is opened due to heat which is generated by the PTC component.

2. The protection device according to claim 1 , wherein both the first and the second non-resettable contact components are fuse components.

3. The protection device according to claim 1 , wherein both the first and the second non-resettable contact components are bimetal components.

4. The protection device according to claim 1 , wherein one non-resettable contact component is a bimetal component, and the other non-resettable contact component is a fuse component.

5. The protection device according to claim 1 wherein the protection device further comprises a heat source and the first non-resettable contact component is under the heat influence of the heat source.

6. An electrical apparatus which comprises a protection device comprising:
a PTC component;
a first non-resettable contact component connected electrically in parallel to the PTC component; and
a second non-resettable contact component connected electrically in series to the PTC component, the second non-resettable contact component being close to or in contact with the PTC component and independent of the heat influence of the first non-resettable contact component;
wherein when the PTC component is tripped by a current which is diverted by opening the contact of the first non-resettable contact component, the contact of the second non-resettable contact component is opened due to heat which is generated by the PTC component.

7. The protection device according to claim 2 wherein the protection device further comprises a heat source and the first non-resettable contact component is under the heat influence of the heat source.

8. The protection device according to claim 3 wherein the protection device further comprises a heat source and the first non-resettable contact component is under the heat influence of the heat source.

9. The protection device according to claim 4 wherein the protection device further comprises a heat source and the first non-resettable contact component is under the heat influence of the heat source.

10. The electrical apparatus according to claim 6 , wherein both the first and the second non-resettable contact components are fuse components.

11. The electrical apparatus according to claim 6 , wherein both the first and the second non-resettable contact components are bimetal components.

12. The electrical apparatus according to claim 6 , wherein one non-resettable contact component is a bimetal component, and the other non-resettable contact component is a fuse component.

13. The electrical apparatus according to claim 6 , wherein the protection device further comprises a heat source and the first non-resettable contact component is under the heat influence of the heat source.

Assignees

• Littelfuse Japan G K
• Littelfuse Inc

Inventors

• Hasunuma Takashi
• Tanaka Arata
• Suzuki Katsuaki
• Oohira Masayuki

Classifications

• H01H85/0241

  Structural association of a fuse and another component or apparatus (switches with built-in fuses H01H9/10, spark-gap arresters H01H85/44, transformers and inductances H01F27/402, capacitors H01G2/14, lamps H01K1/66, semiconductors H10W20/493 or H10W42/80) · CPC title

• H02H3/085 Primary

  making use of a thermal sensor, e.g. thermistor, heated by the excess current (also responsive to the temperature of the protected device H02H5/041, thermal images H02H6/00) · CPC title

• H01C7/02 Primary

  having positive temperature coefficient · CPC title

• H02H5/047

  using a temperature responsive switch · CPC title

• H01H2085/0258

  Structural association of a fuse or a fuse holder with a bimetallic element · CPC title