Resistor R 2 keeps Q 1 off as long as switch S 1 is open. R 1 limits the base current of Q 1 when S 1 is closed. S 1 can be a manual switch, a relay contact, an optocoupler, or a transistor. If you ...

Perhaps there’s a permissive condition that won’t permit the motor controller to provide starting power to the motor. For example, a specific drain valve must be closed. You look in the control ...

Yes, an ECOS can be retrofitted to most any engine, even really old ones. These are readily available on the aftermarket. Check out T-H Marine’s Saf-T-Stop Kill Switches ($37, thmarinesupplies.com) ...

Variable frequency drives offer the best system efficiency in heating and cooling systems, especially if they have an ...

GV2 are 3-phase motor breakers intended for motor control and protection, in line with to IFC 947-2 and IFC 947-4-1 standards. They are connected with screw terminals, and are operated with a rocker ...

Getting a little more specific, a definition in Art. 430.2 states, “A controller is any switch or device that is normally used to start and stop a motor by making and breaking the motor circuit ...

The second circuit is the ignition circuit. When the vehicle key is used to turn the ignition switch to the spring-loaded Start position, 12 volts are supplied to actuate the starter solenoid.

Power is supplied from a three-phase source on the line leads, L1, L2, and L3. Protection against short circuit is required in every motor circuit. This protection, also called “branch circuit ...

Toyota is recalling about 2 million vehicles in the U.S. over power window master switches that may overheat and cause a fire. Recalled Toyota vehicles include certain versions of the Camry, Camry ...