The OFF-NONE-ON or OFF-ON circuit is a maintained, single throw, two-position switch circuit. You would press the bottom of the rocker or move a toggle downward to set the switch to the OFF position, where all switching circuits would be open. If the switch is mounted vertically, you would press the top of a rocker actuator or push a toggle actuator upward to place the switch to the ON position. For basic unlighted double pole switches, the circuit is closed at terminals 2 & 3 and 5 & 6. In general, for basic unlighted single pole switches, the ON position closes the circuit at switch terminals 2 & 3. The ON-NONE-OFF or ON-OFF circuit is a maintained, single throw, two-position switch circuit. A double throw switch (DT) switch opens or closes a circuit at both extreme positions of its actuator, a common example being an ON-NONE-ON switch. A single throw switch (ST) opens or closes a circuit at only one of the extreme positions of its actuator, the most common example being an ON-NONE-OFF switch. Usually the number of "ON" positions that a switch has is the same as the number of throws. The throw of a switch is the number of circuit paths that can be controlled by any one pole. Therefore a normally closed circuit can also be referred to as "normally ON". momentary switch has one or more circuits that are closed when the switch actuator is at its normal or rest position. Therefore a normally open circuit can also be referred to as "normally OFF".Ī normally closed or N.C. An "open" circuit is an incomplete circuit, with "open space" between contacts. momentary switch has one or more circuits that are open when the switch actuator is at its normal or rest position. Momentary switches can be described as normally open or normally closed, which refers to the switch's original or at rest position. For example, the doorbell circuit would be represented as (ON)-NONE-OFF, where (ON) is the momentary position. A simple example of a momentary switch would be a doorbell, which automatically returns back to its resting "OFF" position when no longer actuated.Ĭarling Technologies' catalogs denote momentary circuits using parenthesis. For example, if switched to the "ON" position, the switch will remain in the "ON" position until it is physically switched to another position.Ī momentary switch is a "spring return" switch which automatically returns to its original or at rest position. A maintained switch maintains the mode or position to which it is actuated. An open circuit will not conduct electricity because either air, or some other insulator has stopped or broken the flow of current in the loop.Ĭarling offers a wide range of circuit configurations with both maintained and momentary switch functions. A closed circuit allows an uninterrupted flow of electricity from the source of power, through the conductor or wire, to the load, and then back again to the ground or source of power. A circuit is the closed loop through which electricity can flow.
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