Littelfuse, Inc.

Littlefuse, Inc.

Daniel R Gilman

Daniel F Stanek

William G Rodseth

Nathan C Siegwald

Thomas M Novak

Brian Johnson

Kip McArthur Larson

William Gonzalez

Christopher J Miller

Jesse D Rednour

Zero sequence current sensors for single-phase and multiphase power systems are disclosed. In one implementation, a zero sequence current sensor is positioned between conductors associated with a single-phase power system or a multiphase power system. The current sensor may be shaped to accommodate maintaining a substantially equal distance between the conductors associated with the single-phase power system or the multiphase power system.

Zero sequence sensing apparatus and method

A fuse end cap for providing an electrical connection between a fuse and an electrical conductor. The fuse end cap may include a mounting cuff defining a first cavity that is adapted to receive a fuse body. The mounting cuff may be configured to be mounted to the fuse body by friction fit, for example. The fuse end cap may further include a terminal defining a second cavity adapted to receive a conductor. The terminal may be configured to be crimped about the conductor to retain the conductor within the second cavity.

Fuse end cap with crimpable terminal

An open fuse block is provided having a visual indicator or light assembly connected in parallel with a replaceable fuse mounted in the fuse block. When the fuse is blown, the corresponding visual indicator is illuminated to identify the blown fuse, thereby facilitating quick and easy replacement of the fuse. Since the visual indicator is connected in parallel with the fuse element, when the fuse is blown, the fuse results in an open circuit and the flow of electricity is rerouted through the visual indicator. The visual indicator is thereby illuminated and the corresponding blown fuse can be easily identified. The visual indicator or light assembly can include, for example, a neon bulb, light emitting diode, fluorescent bulb, incandescent bulb, or any other visual indicator that emits light.

Integrated fuse status indication in an open fuse block

An intelligent circuit protection system and method for automating component replacement and providing information to a user or operator about a load for circuit protection. The circuit protection method includes sensing current and voltage across a fuse protecting a load; sending at least one signal indicative of the current and voltage; and using the at least one signal to determine if the load is operating normally.

Intelligent fuse holder and circuit protection methods

A fuse for a moderately hazardous environment comprising: (i) a fuse element; (ii) first and second terminals connected to the fuse element; and (iii) a metal enclosure placed around the fuse element, the enclosure configured to protect the environment from an opening of the fuse element, and wherein the first and second terminals extend from the metal enclosure.

Moderately hazardous environment fuse

A circuit protection device includes: (i) a housing configured to hold a fuse; (ii) a first contact configured to connect the fuse to a power source; (iii) a second contact configured to connect the fuse to a load; and (iv) a sensing circuit placed in parallel with the fuse, the sensing circuit configured to operate on a leakage current running through the circuit after the fuse opens.

Intelligent fuse holder and circuit protection systems

A fuse for a moderately hazardous environment comprising includes: (i) a fuse element; (ii) first and second terminals connected to the fuse element; and (iii) a metal enclosure placed around the fuse element, the enclosure configured to protect the environment from an opening of the fuse element, and wherein the first and second terminals extend from the metal enclosure.

Growing community of inventors

Chicago, IL, United States of America

Daniel R Gilman