M-550 - Marine Ignition Switches Series

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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.


Impact-resistant body cannot rust or corrode. Ignition switch operates like traditional switches: the ‘Run’ position actuates radio, radar, blower, lights, and other accessories. Fits most OEM applications.

Features and Benefits

  • Replaces many boat ignition switches.
  • Fits into standard 7/8” or 1” hole.
  • For added security, switches have individual key codes. Compare with other products in which one key fits every switch of the same model.
  • Corrosion-resistant nickel-plated silver screw terminals have high electrical conductivity. Screw terminals give more reliable connections that are less likely to loosen due to vibration.
Property (Mouseover for details) Value
Current Rating (Continuous) in Amps 10
Number of Positions 3
Positions Off - Ign - Start with Spring Return to Ign and No Anti-Restart
Input Terminals 3 Screw
Housing Brass with O-Ring in Stem
Contact Material Bronze
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