Continuous duty linear solenoids convert electrical energy into mechanical power via a plunger with an axial stroke in either a push or pull action. They are rated for a 100% duty cycle and generally remain in an on-state without interruption for periods of approximately 30 minutes or longer. Electrical current is supplied to a coil that is wound tightly enough to limit the current drain and sized large enough to provide for adequate heat dissipation. The resulting magnetic field draws the plunger from its unpowered, extended position to a seated position against a backstop or pole piece. Because the linear force on the plunger is nonlinear with position, the force is relatively high immediately adjacent to the seated position and declines rapidly with increased distance from the seated position. Continuous duty linear solenoids are considerably larger than intermittent devices and often feature a two-coil design that provides greater pull-and-hold strength than single-coil devices of the same design. For linear solenoids that are capable of both continuous and intermittent duty, force ratings vary widely by duty cycle.