US 10,483,061 B2Granted

Protective device

AssigneeLittelfuse Japan G.K.

InventorsTakayuki Yokota, Masaaki Iwai, Hirotsugu Takegawa, Naotaka Ikawa

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Abstract

A protection device including: (i) a protection component having a first thermal fuse and a resistive body, the resistive body being supplied with a current in an abnormal state to generate heat, the heat activating the first thermal fuse to cut off the current; (ii) a PTC component; and (iii) a second thermal fuse, the second thermal fuse being electrically connected in series to the PTC component, the first thermal fuse of the protection component being electrically connected in parallel to the PTC component and to the second thermal fuse, and the protection component being activated in the abnormal state so that the PTC component trips to generate heat, the heat blowing the second thermal fuse.

Claims12

Dependent claims

A protection device comprising:

(i) a protection component comprising a first thermal fuse and a resistive body wherein in an abnormal state the resistive body is supplied with a current to generate heat, and by the heat the first thermal fuse activates to cut off the current;
(ii) a PTC component;
and
(iii) a second thermal fuse,
wherein the second thermal fuse is electrically connected to the PTC component in series,
the first thermal fuse of the protection component is electrically connected to the PTC component and to the second thermal fuse in parallel, and
by activating the protection component in the abnormal state, the PTC component trips to generate heat, and the heat fuses the second thermal fuse;
wherein an activating time of the PTC component is longer than an insulation time of a fuse element of the first thermal fuse.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/901,987Filed 1 Jul 2014
Priority: JP 2013-1389582 Jul 2013
Published: US 2018/0040443 A18 Feb 2018
Granted: 19 Nov 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H01H 37/34
Thermally-sensitive members: means for transmitting heat thereto, e.g. capsule remote from contact member
H01H 37/60
Details: means for producing snap action
H01H 85/46
Details: circuit arrangements not adapted to a particular application of the protective device
H02H 3/085
Responsive to excess current: making use of a thermal sensor, e.g. thermistor, heated by the excess current

Family

US 2018/0040443 A1Pre-grant publication · published 8 Feb 2018
US 10,483,061 B2This patent

From the US filing history. Foreign family members aren’t listed.

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