MIL-DTL-2212K(SH)
6.8.74 Reversing. Reversing is a control function which permits changing operation of the drive from one
direction to the other.
6.8.75 Rheostat. A rheostat is an adjustable resistor constructed so that its resistance may be changed without
opening the circuit in which it is connected.
6.8.76 Sensing element. Sensing element is a primary measuring device for detecting either the absolute or
variable pressure or temperature.
6.8.77 Service of a controller. The service of a controller is the specific application in which the controller is to
be used, for example:
a.
General purpose.
b.
Definite purpose:
(1) Crane and hoist.
(2) Elevator.
(3) Machine tool.
6.8.78 Starter. A starter is an electric controller for accelerating a motor from rest to normal speed. A starter is
a device designed for starting a motor in either direction of rotation. If it includes the additional function of
reversing, it should be designated a controller.
6.8.79 Starter, autotransformer. An autotransformer starter is a starter provided with an autotransformer which
furnishes a reduced voltage for starting. It includes the necessary switching mechanism and is frequently called a
compensator or autostarter.
6.8.80 Starter, part-winding. A part-winding starter is a starter which applies voltage successively to the
partial; sections of the primary winding of an AC motor.
6.8.81 Starter, primary reactor. A primary reactor starter is a starter which includes a reactor connected in
series with the primary winding of an induction motor to furnish reduced voltage for starting. It includes the
necessary switching mechanism for cutting out the reactor and connecting the motor to the line.
6.8.82 Starter, primary resistor. A primary resistor starter is a starter which includes a resistor connected in
series with the primary winding of an induction motor to furnish reduced voltage for starting. It includes the
necessary switching mechanism for cutting out the resistor and connecting the motor to the line.
6.8.83 Submersible. Submersible means constructed to exclude water when submerged in water under
specified test conditions of pressure and time.
6.8.84 Switch. A switch is a device for making, breaking, or changing the connections in an electric circuit.
6.8.85 Switch, cam-operated. A cam-operated switch is a switch in which the electrical contacts are opened
and closed by a mechanical action of a cam or cams.
6.8.86 Switch, control cutout. A control cutout switch is a switch which interrupts and isolates the control
circuit of an electric controller.
6.8.87 Switch, control-circuit limit. A control-circuit limit switch is a limit switch in which the contacts are
connected only into the control circuit.
6.8.88 Switch, drum. A drum switch is a switch in which the electric contacts are made on segments or
surfaces on the periphery of a rotating cylinder or sector, or by the operation of a rotating cam.
6.8.89 Switch, float. A float switch is a switch which is operated by a buoyant constituent part and is
responsive to the level of liquid.
6.8.90 Switch, limit. A limit switch is a switch which is operated by some part or motion of a power-driven
machine or equipment to alter the electrical circuit associated with the machine or equipment.
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