Protective device
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.
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.