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Methods for turning off the pull coil
After energizing and pulling in the plunger, the pull coil in a dual-coil solenoid must be turned off as soon as possible to prevent overheating. The basic methods for switching off the pull coil are discussed below
External Switching
The externally switched (3-wire) solenoid is used in applications where an operator/driver manually turns a key switch that temporarily energizes the pull coil to pull in the plunger. The most popular application is for start-stop control of engines in trucks and mobile equipment where moisture, dirt, dust, and high vibration are present. The sealed 3-wire solenoid is well suited for these harsh conditions.
External Switching with control Module
With the addition of a pull coil control module, the externally switched (3-wire) solenoid can be used not only in operator/driver controlled vehicles, but also in unattended equipment, throttle, and choke controls. The timer ensures that the pull coil is turned off after energizing, which prevents overheating of the coil in situations such as abusive over cranking of an engine.
Solenoid
