MIL-DTL-2212K(SH)
6.8.4 Automatic. Automatic means self-acting, operating by its own mechanism when actuated by some
impersonal influence as, for example, a change in current strength, pressure, temperature, or mechanical
configuration.
6.8.5 Contact chatter. Contact chatter is a transient condition characterized by the repetitive bouncing (make
and break) of mating electrical contacts. Each contact bounce is usually denoted by transient voltage excursions
equal to or greater than 90 percent of the applied circuit voltage.
6.8.6 Contactor. A contactor is a device for repeatedly establishing and interrupting an electric power circuit.
6.8.7 Contactor, magnetic. A magnetic contactor is a contactor actuated by electromagnetic means.
6.8.8 Contacts. Contacts are conducting parts which coact to complete or to interrupt a circuit.
6.8.9 Contacts, auxiliary. Auxiliary contacts of a switching device are contacts in addition to the main circuit
contacts and function with the movement of the latter.
6.8.10 Contacts, line. Line contacts are contacts on a contactor or relay used solely for controlling the power to
a motor or controlled device.
6.8.11 Contacts, normally open (NO) and normally closed (NC). Normally open and normally closed signify
the position taken by contacts when the device is de-energized. The de-energized condition of a manual device is
the off position.
6.8.12 Control circuit. The control circuit of a control apparatus or system is the circuit which carries the
electrical signals directing the performance of the controller, but does not carry the main circuit power.
6.8.13 Control circuit transformer. A control circuit transformer is a voltage transformer used to supply a
voltage for operation of control devices.
6.8.14 Control relay. A control relay is a device for repeatedly establishing and interrupting an electric circuit.
A control relay is usually employed to actuate other relays or contactors in the same or associated circuits.
6.8.15 Control, local. Local control or device is a control function or device which provides for initiation or
change of a control function from within or directly upon the controller enclosure.
6.8.16 Control, remote. Remote control or device is a control function or device which provides for initiation
or change of a control function from a remote point.
6.8.17 Control, three-wire. Three-wire control is a control function which utilizes a momentary contact pilot
device and a holding circuit contact to provide undervoltage protection.
6.8.18 Control, two-wire. Two-wire control is a control function which utilizes a maintained contact pilot
device to provide undervoltage release.
6.8.19 Controller, electric motor. An electric motor controller is a device or group of devices which governs, in
some predetermined manner, the electric power to the motor. An electric motor controller is distinct functionally
from a simple disconnecting device whose principal purpose in a motor circuit is to disconnect the circuit, together
with the motor and its controller, from the power source.
6.8.20 Controller, full-magnetic. A full-magnetic controller is an electric controller having all of its basic
functions performed by devices which are operated by electromagnets. Basic functions usually refer to acceleration,
retardation, line closing, reversing, and so forth.
6.8.21 Corrosion-resistant. Corrosion-resistant means constructed, protected, or treated so that corrosion will
not exceed specified limits under specified test conditions.
6.8.22 Disconnection. Disconnection is the opening of a sufficient number of conductors to prevent current
flow.
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