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Solenoids & Relays

All the solenoids Littelfuse produces for commercial vehicles serve as control relays. Our solenoids act as on–off switches for starters, motors, and canopy and door lights. Other solenoids open and close valves, engage and disengage motor brakes, and secure and release latches. We make mechanical solenoids and sold-state relays, so browse our website and select the solution that best meets your need.

Subcategories under Solenoids & Relays

Automotive Solid State Relays

Conserve vehicle battery charge and gain control of electrical systems by installing automotive solid state relays made by Littelfuse. These normally

Battery Combiners

What is a battery combiner? A battery combiner (also known as a battery combiner switch) is a relay that automatically connects two or more batteries

Battery Isolators

What is a battery isolator? Battery isolators allow an alternator to charge multiple batteries and prevent loads on an auxiliary battery from

Bi-Stable Latching Relays

Bi-stable latching relays serve as battery isolators and battery disconnects in commercial vehicles. In other words, they are on–off switches.

FlexMod Electronic Modules

FlexMod^TM electronic control modules can serve as dc battery isolators and disconnect relays, internal and trailer light timers, and

Low-Voltage Disconnects

Using a low voltage disconnect relay helps prolong vehicle battery life by preventing a charge from draining while the vehicle is idle. Standard and

Plug-In Relays

We offer a variety of reliable automotive plug-in relays for lighting, starting, horn, and heating and cooling control, as well as time-delayed

Specialty Relays

Our specialty electrical relays are engineered for specific functions, including remotely switching loads in heavy-duty vehicles and reversing the

Standard High-Current Relays

Standard high-current relays are designed for remotely switching circuits with mid- to high-current loads. These high-current solenoids are

Solenoids & Relays Parts

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Solenoids & Relays Resources

Solenoids & Relays Featured Products

Solenoids & Relays Information Center

We make the following types of solenoids

12 V, 24 V, and 36 V
Continuous or intermittent duty
Available in steel or molded housings
Latching solenoids that are energized and de-energized by a momentary switch
Electronic solenoids rated at 85 A continuous that can be used in systems rated from 9 V to 31 V

Solenoids and relays work well in these types of vehicles

Trucks
Street Trucks (e.g., Snowplow, Bucket, Garbage, Sweepers)
Buses and RVs (e.g., School, Commercial, Transit, Motor Homes)
Construction (e.g., Backhoes, Pavers, Bulldozers, Compactors)
Agriculture (e.g., Harvesters, Combines, Tractors)
Emergency (e.g., Ambulance, Fire, Police)

Make and break are terms which apply to any switching situation, but particularly to intermittent duty solenoids, where the buildup of heat can cause failure of the component. Make and break are ratings. A particular component, such as a solenoid, may be rated for duty at a given amperage and voltage that should not be exceeded.

Make is when the switch (or solenoid) is turned On (the circuit is 'made'), and break is when the switch is turned Off (the circuit is 'broken'). Such values would need to be checked with an instrument such as a meter. Note also that Intermittent Duty Solenoids have a limitation on the time (duty cycle) they may be kept On and the time they need to recover (to allow heat dissipation.)

Littelfuse acquired Cole Hersee in 2010 to offer their customers a more extensive portfolio of products in the commercial vehicle market. Since Cole Hersee was founded in 1924, they have been a pioneer and leader in the development of heavy-duty electrical products for the vehicle industry, and have earned a reputation for quality and value. Cole Hersee has collaborated on many basic industry standards and is a preferred supplier of over 2000 dependable vehicle products and accessories.

Littelfuse Cole Hersee Brand products are available as standard or custom designed products to meet customer needs. Contact us to discuss the possibilities. Our engineers are on hand to design from the ground up the best solution to your application.