Serrated electrical contacts

A solenoid switch for a motor, the solenoid switch comprising:

• a solenoid case;
• a solenoid having at least one control terminal positioned on an outer surface of the solenoid case, for connection to at least one external control cable;
• two power terminals positioned on the outer surface of the solenoid case, for connection to external power cables;
• two stationary serrated electrical contacts mounted within the solenoid case, each stationary serrated electrical contact electrically connected to a corresponding one of the power terminals;
• two movable electrical contacts coupled to the solenoid and electrically connected to windings of the motor, each movable electrical contact corresponding to one of the two stationary serrated electrical contacts, and movable by applied force of the solenoid,
• wherein in response to a control signal received by the at least one control terminal, the solenoid is energized and physically moves the two movable electrical contacts to mate with the corresponding two stationary serrated electrical contacts resulting in an electrical connection between the power cables and the motor windings.