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Electric Switch Terms

Actuator – A mechanism that puts something into automatic action. In electrical switch terms, actuators include plungers, plain levers, simulated roller levers, etc.
 
Alternating Current (AC) – An electrical current that intermittently changes direction of flow.
 
Ampere-Turns (AT) – A unit of measurement that is used to define switch sensitivity. AT is calculated by the number of turns of the coil in which the switch is tested and the current (expressed in amps) that flows through the coil.
 
Break – The opening of a circuit, the act of which prohibits current flow.
 
Circuit – A closed path along which an electric current flows.
 
Detent – A mechanism consisting of a spring and starwheel that holds a switch in a specified position.
 
Direct Current (DC) – An electric current that flows in only one direction.
 
Drop-Out (DO) – The point at which the switch contacts simply release, expressed in ampere-turns.
 
Ground – The part of an electric circuit connected to the earth that has a zero potential. Most electric switches have ground connections.
 
Latching – The ability of a relay to have its contacts opened or closed upon command and remain in that position until another command is given.
 
Make – The closing of a contact, the act of which permits current flow.
 
Maximum Switching Current – The maximum load, referred to as amperage, that an electric switch is capable of carrying.
 
Normally Closed (NC) – A term that refers to a switch which is closed and connected in its normal position.
 
Normally Open (NO) – A term that refers to a switch which is open and disconnected in its normal position.
 
Plain Lever – A small rigid bar that is attached to a pivot point and is activated by being pushed one way or another. Lever switches normally have two or three positions.
 
Plunger – A type of actuator that is activated with a push or thrust.
 
Pole – An independent electrical circuit of a switch.
 
Set Point – The specific point at which an element of an electrical switch functions, expressed in psi, psia or inches of mercury.
 
Terminal – The position in a circuit at which a connection is normally established or broken.
 
Thermoplastic – A plastic material that can be heated and expanded, as well as cooled and stiffened, without any significant chemical change. Thermoplastics serve as dedicated housing to some switches.
 
Rating – A specified performance limit given to switches. Volts (V) and amperes (amps) are the standard units for establishing ratings.