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(888) 312-8812 Login SignupWhat function does a small, spring-loaded switch serve in a heavy-duty truck? In the case of the Pollak Ball Plunger Switch, it enables critical momentary activation in various electrical circuits. This SPST (Single Pole, Single Throw) switch operates across 6, 12, or 24-volt systems and is typically used in applications like door-activated lights, mechanical position sensing, or starter circuit interlocks. Its ball plunger mechanism provides tactile response and repeatable contact without excessive resistance, allowing reliable activation under rugged conditions. Order the Pollak 21-635 today.
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Founded in 1909, Pollak®, by SMP, supplies the transportation industry with innovatively designed yet competitively priced OEM and aftermarket parts for automotive, marine, agriculture, construction, and trucking (light-, medium- and heavy-duty) applications. Pollak employs over 1,000 employees in its three manufacturing facilities where design, production, and in-house testing take place. A certified ISO9001/QS9000 manufacturer, Pollak is known for its ability to design and manufacture products via manual, high-volume, semi-automatic, or fully automated production. This brand takes great pride in earning Q1 preferred standing for Navistar V, Ford, Chrysler's Gold Pentastar, and General Motors' Mark of Excellence. It also got the same ranking with other respected O.E. manufacturers like Freightliner, Caterpillar, John Deere, PACCAR, Case, and Borg-Warner.
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