Replacement mechanical switch for circular saws — reverses polarity and restores on/off and variable-speed control Key benefits Restores safe, reliable operation: Replaces worn or failing mechanical switches that degrade with use and eventually need replacement. Reverses electrical polarity when needed: The internal mechanical design allows polarity reversal to suit specific wiring or motor requirements. Consolidates functions: Handles all on/off switching and variable-speed control in a single replacement unit, simplifying repairs. Direct replacement part: Designed as a common service part for power tools, suitable for circular saw models that use a mechanical switch. What it does and why you need it Fixes common failure mode: Mechanical switches in saws wear over time, causing intermittent power, loss of speed control, or complete failure. Replacing the switch restores normal function without replacing the entire tool. Maintains motor control: Because this switch supports variable-speed operation, it preserves the saw’s ability to match speed to material and cut type. Offers wiring flexibility: The switch’s mechanical polarity capability helps when wiring changes or motor configurations require polarity reversal. Key attributes Function: On/off switching and variable-speed control with reversible electrical polarity. Compatibility: Intended for circular saws and other power tools that accept a mechanical switch replacement. Design: Mechanical internal mechanism suitable for replacing factory-installed mechanical switches. Performance: Restores reliable switching and speed control for saw operation; addresses degradation common to mechanical switch components. Typical use scenarios Home workshop repair: Replace a worn switch in a household circular saw to restore dependable on/off and speed control without buying a new tool. Professional maintenance: Keep a service kit on hand for rapid swap-out of failed switches in jobsite circular saws to minimize downtime. Tool refurbishment: Use during refurbishing of used or older circular saws where the original mechanical switch has degraded or malfunctioned. Notes Confirm compatibility with your specific circular saw model and wiring before installation. This product replaces mechanical-style switches; it is not a drop-in replacement for electronic-control modules or switches with different mounting or connector types.