MIL-DTL-2212K(SH)
6.8.91 Switch, master (see also push-button). A master switch is a switch which dominates the operation of
contactors, relays, or other remotely operated devices.
6.8.92 Switch, pressure. A pressure switch is a switch which is operated by a constituent part and is responsive
to fluid (gas or liquid) pressure.
6.8.93 Switch, proximity. A proximity switch is a device which reacts to the proximity of an actuating means
without physical contact or connection therewith.
6.8.94 Switch, selector. A selector switch is a manually operated, multiposition switch for selecting an
alternative control circuit.
6.8.95 Switch, temperature. A temperature switch is a two-state (on-off) controller which is responsive to the
temperature of a sensed medium.
6.8.96 Temperature rise. Temperature rise refers to the increase in temperature above ambient, measured in
degrees Celsius, which will be reached by a device during its normal operation.
6.8.97 Tests, dielectric. Dielectric tests are tests which consist of the application of a voltage higher than the
rated voltage for a specified time for the purpose of determining the adequacy against breakdown of insulating
materials and spacings under normal conditions.
6.8.98 Thermal cutout. A thermal cutout is an overcurrent protective device which contains a heater element in
addition to and affecting a fusible member which opens the circuit.
6.8.99 Thermal protector (as applied to motors and generators). A thermal protector is a protective device
which is intended for assembly as an integral part of the machine and which, when properly applied, protects the
machine against dangerous overheating due to overload and, in a motor, failure to start.
6.8.100 Time delay. Time delay means that a time interval is purposely introduced in the performance of a
function.
6.8.101 Transition, closed-circuit. Closed-circuit transition, as applied to reduced-voltage controllers,
including star delta controllers, is a method of starting in which the power to the motor is not interrupted during the
starting sequence.
6.8.102 Ultimate tripping current. Ultimate tripping current is the minimum value of continuously applied
current that will cause an overload relay to operate (trip).
6.8.103 Ventilated. Ventilated means constructed to provide for the circulation of external air through the
enclosure to remove heat, fumes, or vapors.
6.8.104 Watertight. Watertight means constructed to exclude water applied in the form of a hose stream under
specified test conditions.
6.8.105 Waveform, output. Output waveform is the graphical representation of the output during one pulse
interval.
6.8.106 When specified. A requirement for a function or item necessitated by the system design.
6.9 Commonality equipment selection approach. NAVSEA initiated a commonality effort to define and reduce
variation within systems, subsystems, and components. This revision of the specification employs a commonality
approach towards equipment selection. By utilizing commonality equipment, variation is reduced while maintaining
and improving performance. Equipment commonality is used to (1) specify only magnetic controllers which can
also perform functions of manual controllers and (2) specify only three-phase magnetic controllers which may also
operate as a single-phase controller provided appropriate wiring changes to the overload relay is properly
implemented. This effort will modify the specification to ensure commonality shelf items are applied within the
design and modernization of Navy ships.
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