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: 2017-07-19

The present invention provides a protective element including (i) a PTC element having an opening passing through in the thickness direction, and (ii) a first electrode and a second electrode positioned on both main surfaces of the PTC element, the protective element characterized in that the first electrode extends from a main surface of the PTC element over an edge thereof and into the opening. A protective element of the present invention does not prevent the PTC element from expanding even when secured by a screw or caulking.


Patent
Littelfuse | Date: 2017-01-19

Approaches herein provided surface mounted devices each configured as a stand-alone component suitable for attachment to a substrate such as a printed circuit board (PCB). In some embodiments, a method includes forming a base housing, coupling an electronic component to the base housing, and forming a cover over the electronic component, wherein the cover is coupled to the base housing. The electronic component may include a fusible link/element extending between terminals, the terminals wrapped around an exterior of base housing. The device may then be coupled to the PCB, for example, by attaching the terminals to an upper surface of the PCB.


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: 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: 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: 2017-05-24

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: 2017-06-14

In one embodiment a varistor may include a ceramic body. The varistor may further comprise a multilayer coating disposed around the ceramic body. The multilayer coating may include a first layer comprising a phenolic material or a silicone material; and a second layer adjacent the first layer, the second layer comprising a high dielectric strength coating.


Patent
Littelfuse | Date: 2017-06-14

In one embodiment a varistor (100) may include a ceramic body (102). The varistor (100) may further comprise a multilayer coating disposed around the ceramic body (102). The multilayer coating may include an outer layer (108) comprising an epoxy material. The multilayer coating may also include an inner layer (106) that is adjacent the ceramic body (102) and is disposed between the outer layer (108) and the ceramic body (102). The inner layer (106) may comprise a polymeric material that is composed of an acrylic component.


Patent
Littelfuse | Date: 2017-06-21

An electrical system may include at least one heat sensor for measuring a temperature of an electrical conductor, and a controller operatively coupled to the at least one heat sensor and configured to arrest current in the electrical conductor if the measured temperature exceeds a predefined threshold temperature.

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