US 12,340,963 B2
Trip and reset mechanism for leakage current detection and interruption device
Xiaoming Zhang, Suzhou (CN); and Chengli Li, Suzhou (CN)
Assigned to Chengli Li, Suzhou (CN)
Filed by Chengli Li, Suzhou (CN)
Filed on Oct. 11, 2022, as Appl. No. 18/045,552.
Claims priority of application No. 202211203085.4 (CN), filed on Sep. 29, 2022; and application No. 202222589322.7 (CN), filed on Sep. 29, 2022.
Prior Publication US 2024/0112872 A1, Apr. 4, 2024
Int. Cl. H01H 51/01 (2006.01); H01H 50/02 (2006.01); H01H 50/18 (2006.01); H01H 50/44 (2006.01); H01H 51/06 (2006.01)
CPC H01H 50/18 (2013.01) [H01H 50/02 (2013.01); H01H 50/44 (2013.01); H01H 51/01 (2013.01); H01H 51/06 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A core unit for a leakage current detection and interruption device, comprising:
a control circuit board;
a drive coil assembly, coupled to the circuit board, including at least a coil holder frame and a first one of an input assembly and an output assembly connected to the coil holder frame;
a magnetic movement assembly, nested with the drive coil assembly, including at least a magnetic movement frame and a second one of the input assembly and the output assembly connected to the magnetic movement frame;
wherein in response to relative movements between the drive coil assembly and the magnetic movement assembly away from each other or toward each other, the input assembly and the output assembly are disconnected from each other or connected to each other, respectively; and
a trip spring disposed between the drive coil assembly and the magnetic movement assembly, configured to keep the input and output assemblies disconnected from each other;
wherein the drive coil assembly further includes a solenoid disposed on the coil holder frame, and an iron core and a core spring disposed inside the solenoid, wherein the core spring is nested around the iron core, wherein back and forth movements of the iron core within the solenoid are configured to drive the input and output assemblies to be connected to each other; and
wherein the solenoid includes a radially inwardly protruding step feature located inside the solenoid at an end closer to the magnetic movement assembly, configured to support the core spring, and wherein the iron core includes a cap located at an end farther away from the magnetic movement assembly, and wherein the core spring is restrained between the step feature and the cap.