US 12,191,102 B2
Dual-element fuse with chemical trigger element and methods of manufacture
Venancio Esteban Narciso, Chihuahua (MX); Luis Adrian Tarin Leal, Chihuahua (MX); and Luis Marcelo Sanchez Soltero, Chihuahua (MX)
Assigned to Eaton Intelligent Power Limited, Dublin (IE)
Filed by EATON INTELLIGENT POWER LIMITED, Dublin (IE)
Filed on Nov. 12, 2021, as Appl. No. 17/525,163.
Prior Publication US 2023/0154715 A1, May 18, 2023
Int. Cl. H01H 85/00 (2006.01); H01H 85/11 (2006.01); H01H 85/12 (2006.01); H01H 85/38 (2006.01); H01H 85/47 (2006.01)
CPC H01H 85/11 (2013.01) [H01H 85/0039 (2013.01); H01H 85/0056 (2013.01); H01H 85/12 (2013.01); H01H 85/38 (2013.01); H01H 85/47 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electrical fuse comprising:
a short circuit fusible element configured to interrupt a high overcurrent corresponding to a short circuit condition, wherein the short circuit fusible element comprises first and second perforated walls, the first and second perforated walls extending in spaced apart parallel planes to one another;
a trigger element connected in series with the short circuit fusible element, wherein the trigger element comprises a pair of metal elements separated by a gap, the gap extending through a full cross-sectional area of each of the pair of metal elements, the gap covered by a filler element comprising tin such that at least a portion of the filler element is electrically connected in series with each of the pair of metal elements; and
an arc barrier material locally disposed on opposing sides of the filler element and comprising a silicone material,
wherein the trigger element is configured to interrupt a predefined overload condition with a predetermined time delay, the overload condition comprising a low overcurrent through the trigger element lower than the high overcurrent,
wherein the filler element covering the gap is configured as a heat sink to delay a rate of temperature increase and delay melting of the filler element based on a flow of the low overcurrent through the trigger element, and
wherein at least a portion of the filler element is configured to diffuse into at least one of the pair of metal elements under the predefined overload condition to permit the trigger element to provide the predetermined time delay for interrupting the predefined overload condition.