1MR3550M2
Switch
Mack

Rugged electrical switch designed for heavy-duty use in Mack trucks, with sealed housing and high-current contacts to manage accessories, lights, or ignition circuits. The unit is built to resist dust, moisture, and vibration, keeping electrical signals clean and reliable in extreme conditions. Contacts are machined for consistent, repeatable engagement and quick response, ensuring predictable control from the dash or switch panel. The design includes standardized terminals and mounting patterns to fit common harness configurations, reducing install time and the risk of mis-wiring. The switch is rated for repeated cycling, which translates to longer service life in fleets with frequent start/stop duty cycles. Thermal management considerations are baked in, with a compact footprint that minimizes heat buildup in crowded instrument panels. This part plays a key role in fleet reliability, because a dependable control input eliminates the chance of unexpected equipment shutdowns or consumer electronics malfunction. For parts compatibility, refer to OEM diagrams and service manuals. Source One Parts Center stands behind these components as a convenient, dependable supply source.