MIL-DTL-2212K(SH)
6.8.58 Push-button station. A push-button station is a unit assembly of one or more externally operable
push-button switches, sometimes including other pilot devices such as indicating lights or selector switches, in an
enclosure.
6.8.59 Rating of a controller. The rating of a controller is an arbitrary designation of an operating limit. It is
based on the power governed and on the duty and service required. A rating is arbitrary in the sense that it must
necessarily be established by definite fixed standards and cannot, therefore, indicate the safe operating limit under
all conditions which may occur.
6.8.60 Rating, continuous. Continuous rating is the rating which defines the substantially constant load which
can be carried for an indefinitely long time.
6.8.61 Rating, 8-hour (as applied to a magnetic contactor). The 8-hour rating of a magnetic contactor is the
rating based on its ampere carrying capacity for 8 hours, starting with new clean contact surfaces, under conditions
of free ventilation, with full rated voltage on the operating coil, and without causing any of the established
limitations to be exceeded.
6.8.62 Reduced voltage. Reduced voltage is the characteristic of a controller where the full line voltage is not
immediately impressed upon the apparatus, but is applied gradually or in stages by means such as resistors or
autotransformers.
6.8.63 Relay, magnetic control. A magnetic control relay is a relay which is actuated by electromagnetic
means. When not otherwise qualified, the term refers to a relay intended to be operated by the opening and closing
of its coil circuit, and having contacts designed for energizing and deenergizing the coils of magnetic contactors or
other magnetically operated devices.
6.8.64 Relay, magnetic overload. A magnetic overload relay is an overcurrent relay in which the electrical
contacts are actuated by the electromagnetic force produced by the full or partial load current.
6.8.65 Relay, overload. An overload relay is an overcurrent relay which functions at a predetermined value of
overcurrent to cause disconnection (see 6.8.22) of the load from the power supply. An overload relay is intended to
protect the load (for example, motor armature) of its controller, and does not necessarily protect itself.
6.8.66 Repeatability. Repeatability is the degree of correspondence between successive readings of the same
transition when measured in the same manner. It is expressed as plus or minus deviations.
6.8.67 Reset. To reset means to restore a mechanism, storage, or device, to a prescribed state.
6.8.68 Reset, automatic. Automatic reset is a function which operates to automatically reestablish specific
conditions.
6.8.69 Reset, manual. Manual reset is a function which requires a manual operation to reestablish specific
conditions.
6.8.70 Resistance. Resistance is the (scaler) property of an electric circuit, or of any body, which may be used
as part of an electric circuit.
Resistance determines, for a given current, the rate at which electric energy is converted into heat or radiant
energy, and has a value such that the product of the resistance and the square of the current gives the rate of
conversion of energy. In general, resistance is a function of the current, but the term is most commonly used in
connection with circuits where the resistance is independent of the current.
6.8.71 Resistance starting. Resistance starting is a form of reduced voltage starting employing resistances
which are short-circuited in one or more steps to complete the starting cycle.
6.8.72 Resistant (used as a suffix). Resistant, used as a suffix, means constructed, protected, or treated so that
the apparatus will not be damaged when subjected to the specified material or conditions for a specified time.
6.8.73 Resistor. A resistor is a device used to introduce resistance into an electric circuit.
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