MIL-DTL-2212K(SH)
6.8.38 Interlock. An interlock is a device actuated by the operation of some other device with which it is
directly associated to govern succeeding operations of the same or allied devices. Interlocks may be either electrical
or mechanical.
6.8.39 Isolation. Isolation is the opening of all conductors connecting to the power source.
6.8.40 Jog (inch). Jog (inch) is a control function which permits the momentary operation of a drive for the
purpose of accomplishing a small movement of the driven machine.
6.8.41 Limit. Limit means that the designated quantity is controlled so that a prescribed boundary condition is
not exceeded.
6.8.42 Limit, current. Current limit is a control function which prevents a current from exceeding its prescribed
limits. Current limit values should be expressed as a percent of rated load value.
6.8.43 Low voltage protection (LVP). LVP is the effect of a device which, on the reduction or failure of
voltage, causes and maintains the interruption of power to the main circuit until the circuit is restarted manually.
6.8.44 Low voltage release (LVR). LVR is the effect of a device which, on the reduction or failure of voltage,
causes the interruption of power to the main circuit, but does not prevent the reestablishment of the main circuit on
return of voltage.
6.8.45 Low voltage release effect (LVRE). LVRE is the effect of a device which remains unchanged on the
reduction or failure of voltage and does not cause an interruption of power.
6.8.46 Maximum proof pressure. Upper pressure at which performance of switch in the operating range will
not be disturbed and exceeds maximum operating pressure.
6.8.47 Noise. Noise is an unwanted signal.
6.8.48 Nonautomatic. Nonautomatic means that the implied action requires personal intervention for its
control. As applied to electrical controllers, nonautomatic does not necessarily imply a manual controller, but only
that personal intervention is required.
6.8.49 Nonreversing. Nonreversing is a control function which provides for operation in one direction only.
6.8.50 Nonventilated. Nonventilated means constructed to provide no intentional circulation of external air
through the enclosure.
6.8.51 Open momentarily, or momentary opening. Where applied in this specification, these expressions mean
that an interval of contact physical opening may occur during high impact shock.
6.8.52 Part. A part is an item provided as an integral part of a controller such as a contactor, relay, indicating
light, or push-button.
6.8.53 Pickup and seal voltage. The pickup and seal voltage of a magnetically operated device is the minimum
voltage at which the device moves from its de-energized into its fully energized position.
6.8.54 Pickup voltage or current. The pickup voltage or current of a magnetically operated device is the
voltage or current at which the device starts to operate.
6.8.55 Programmable logic controller (PLC). A PLC is a digitally operating electronic apparatus which uses a
programmable memory for the internal storage of instructions for implementing specific functions such as logic,
sequencing, timing, counting, and arithmetic to control, through digital or analog input and output modules, various
types of processes.
6.8.56 Protection, overload. Overload protection is the effect of a device operative on excessive current, but
not necessarily on short circuit, to cause and maintain the interruption of current flow to the device governed.
6.8.57 Push-button. A push-button switch (push-button) is a master switch (see 6.8.91) having a manually
operable plunger or button for actuating the switch.
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