Chicago, IL, United States
Chicago, IL, United States

Littelfuse, Inc is a multinational electronic manufacturing company based in Chicago, Illinois. The company primarily produces circuit protection products but also manufactures a variety of electronic switches and automotive sensors. Gordon Hunter serves as Littelfuse CEO.Littelfuse is the developer of AutoFuse, the first blade-type automotive fuse. Wikipedia.


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Patent
Littelfuse | Date: 2016-09-09

A power distribution housing including a base, a cover adapted to fit onto the base, a latch member adapted to removably secure the cover to the base, the latch member having a first end pivotably connected to the base and a second end having a latch detent extending therefrom, the latch detent configured to engage a catch in the cover when the latch member is pivoted to a latched position wherein the cover is secured to the base by the latch member, and a locking member coupled to the latch member, the locking member movable between a locked position, in which a locking member extension of the locking member engages a locking member recess in the cover and prevents the latch member from being moved from the latched position to an unlatched position, and an unlocked position in which the locking member extension does not engage the locking member recess.


Patent
Littelfuse | Date: 2016-10-21

An improved fuse including a fuse body formed of an electrically insulative material. The fuse body defines a cavity which extends from a first end of the fuse body to a second end of the fuse body. A fusible element is disposed within the cavity and extends from a first end face of the first end of the fuse body to a second end face of the second end of the fuse body. Insulated plugs are disposed within the cavity at the first and second ends of the fuse body wherein the plugs adhere to an interior surface of the fuse body and form seals that close the internal cavity. The fuse may further include end terminations that are applied to the ends of the fuse body in electrical contact with the fusible element.


Patent
Littelfuse | Date: 2017-01-25

A circuit protection assembly 100 can include a conductive assembly post 110 that supports a first conductive element 104, a non-conductive isolator 108, a second conductive element 106, a fuse 102, and a conductive fastener 112. The first and second conductive elements can be positioned in close proximity to one another below the fuse. A first portion of the isolator can separate the first and second conductive elements. A second portion of the isolator can separate the conductive assembly post from the second conductive element. The first conductive element can be coupled to a power source and the second conductive element can be coupled to a downstream circuit. The fuse can protect the downstream circuit during specified overvoltage and/or overcurrent conditions and can be quickly and efficiently installed and replaced without the need to remove or reattach the conductive elements or any other cabling or wires.


Patent
Littelfuse | Date: 2017-01-11

The present invention proposes a protection device which has a large rated voltage and a large rated current, which is capable of sufficiently suppressing arc generation during activation, and which is also capable of providing suitable protection against overcurrent due to short circuiting or the like of a main circuit. The protection device of the present invention includes (i) a protection element which includes a first thermal fuse and a resistor, and in which the resistor generates heat as a result of current passing through the resistor when there are abnormalities, and the first thermal fuse is activated due to this heat and interrupts the current, (ii) a PTC element and a second thermal fuse which are electrically connected in parallel to the first thermal fuse and which are electrically connected in series to each other, and (iii) a current fuse which is electrically connected in series to the first thermal fuse.


Patent
Littelfuse | Date: 2017-03-15

A method for forming (10) a fuse comprising: threading a fusible element (30) through a cavity (25) of a fuse body (20) with ends of the fusible element (30) being disposed on end faces at respective ends (26-A, 26-B) of the fuse body (20); and depositing an insulative adhesive (40-A, 40-B) within the cavity (25) proximate the ends (26-A, 26-B) of the fuse body (20), wherein the insulative adhesive (40-A, 40-B) adheres to an interior surface of the fuse body (20) and seals the cavity (25).


Patent
Littelfuse | Date: 2016-12-28

Exemplary embodiments of the present invention are directed to a circuit protection device, A circuit protection device may comprise a housing defining a cavity and a metal oxide varistor (MOV) disposed within the cavity. The circuit protection device may further comprise a first terminal electrically attached at a first end to the MOV by solder and extending outside of the housing at a second end. An arc shield is disposed within the housing between the first end of the first terminal and at least partially over the solder. The circuit protection device may further comprise a spring configured to bias the arc shield against a micro switch having an indicator portion disposed at least partially outside of the housing. When a voltage surge condition occurs, the MOV changes from a non-conductive state to a conductive state and current flows between the first terminal and a second terminal where the heat generated by the current flowing through the varistor melts the solder and the first end of the first terminal electrically separates from the varistor.


An electromagnetic interference (EMI) circuit assembly includes a first, second, and third conductive layer. A protection component disposed between the first and second conductive layers. A dielectric layer is disposed between the second and the third conductive layers. The protection component is configured to protect a load from one or both of an overcurrent condition and an over temperature condition, and the third layer define a capacitor configured to suppress EMI signals.


Patent
Littelfuse | Date: 2017-05-24

A linear motion sensor (20) has two pairs (22) of opposed spaced apart stacks of two simple two-pole bar magnets (24,26). Each stack has one shorter outer magnet (26) and one longer inner magnet (24), with the outer magnets centered on the inner magnets. The poles of the magnets are oriented the same in each pair, but opposite with respect to the other pair. The shape of the magnets results in the magnetic fields produced by each pair of magnets being substantially outside of the magnets themselves, so that the load line for the combined magnets is above the knee in its B/H material demagnetization curve. The pairs of magnets define a gap therebetween in which a magnetic field sensor is mounted for travel. The shorter magnets are about one half the length of the longer magnets such that the magnetic field in the gap varies substantially linearly as the sensor moves along the gap.


Patent
Littelfuse | Date: 2017-02-09

A convenient, cost-effective method for manufacturing low-current fuse elements. The method may include the steps of stamping a substrate out of a sheet of material and stamping at least one hole in the substrate. The method may further include the steps of bonding a layer of fuse material to a surface of the substrate with a portion of the fuse material covering the hole, stamping a fuse element out of the portion of fuse material covering the hole, and separating an individual fuse from the fuse material and the substrate. A low-current fuse can thereby be obtained using an easily performed stamping process.


Patent
Littelfuse | Date: 2016-06-22

A system for measuring a current from a battery with a Hall Effect sensor, the current powering a primary load and a secondary load. The system to calculate a status of the battery based on the measured current, then compare the status of the battery to a predetermined value. The system to activate a relay when the status of the battery is below a predetermined value, activation of the relay to prevent the current from powering the secondary load.

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