Switches are commonly replaced parts in power tools. A switch handles all on/off and variable speed functions. They also have a role in electric breaking; They can momentarily reverse electrical polarity, because switches use mechanical internals, they tend to degrade and wear out over time eventually requiring replacement
Some common signs of a broken or failing switch are: Tool has completely stopped functioning - it will not turn on Tool operates intermittently, requiring miltiple tries to turn on, until eventually it won't turn on at all Variable speed function and electric braking aren't working properly
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Electrical Power Trigger Switch Replacement for Circular Saws Grinders, L50 Aftermarket Trigger Switch replaces for 651172-0, 651121-7, 651168-1