PROTECTIVE DEVICE

• US 20150229118A1
• Filed: 12/17/2012
• Published: 08/13/2015
• Est. Priority Date: 12/27/2011
• Status: Active Grant

• Current Assignee: Littelfuse Japan G.K. (Littelfuse Incorporated)
• Original Assignee: Tyco Electronics Japan GK (TE Connectivity Ltd. (United Kingdom))
• Inventors: Hasunuma, Takashi, Tanaka, Arata, Suzuki, Katsuaki, Oohira, Masayuki
• Granted Patent: US 9,923,362 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01C 7/02 having positive temperature coefficient ceramics C04B
• CPC Class Codes: H01H 2085/0258 Structural association of a fuse or a fuse holder with a bimetallic element
• CPC Class Codes: H01H 85/0241 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 H01L23/5256 or H01L23/62
• CPC Class Codes: H02H 3/085 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 Class Codes: H02H 5/047 using a temperature responsive switch

Abstract

The present invention provide a protection device which comprises a PTC component and a first non-resettable contact component which is connected electrically in parallel to the PTC component, characterized in that 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.

Claims

1. A protection device which comprises

a PTC component and a first non-resettable contact component which is connected electrically in parallel to the PTC component, characterized in that

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 is opened due to heat which is generated by the PTC component.

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

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

4. The protection device according to claim 1, characterized in that 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.

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.

6. An electrical apparatus which comprises a protection device comprising

a PTC component and a first non-resettable contact component which is connected electrically in parallel to the PTC component, characterized in that

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 is opened due to heat which is generated by the PTC component.

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

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

12. The electrical apparatus according to claim 6, characterized in that 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.