1) "Spdt" -- As to spdt relay

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2) "Relay" -- As to spdt relay
¹re·lay
Pronunciation: 'rE-"lA
Function: noun
Etymology: Middle English, set of fresh hounds, from relayen
1 a : a supply (as of horses) arranged beforehand for successive relief b : a number of persons who relieve others in some work <worked in relays around the clock>
2 a : a race between teams in which each team member successively covers a specified portion of the course b : one of the divisions of a relay
3 : an electromagnetic device for remote or automatic control that is actuated by variation in conditions of an electric circuit and that operates in turn other devices (as switches) in the same or a different circuit
4 : SERVOMOTOR
5 : the act of passing along (as a message or ball) by stages; also : one of such stages
Pronunciation Symbols

Automotive style miniature relay
A relay is an electrical switch that opens and closes under control of another electrical circuit. In the original form, the switch is operated by an electromagnet to open or close one or many sets of contacts. It was invented by Joseph Henry in 1835. Because a relay is able to control an output circuit of higher power than the input circuit, it can be considered, in a broad sense, to be a form of an electrical amplifier.

1 Operation

2 Types of relay

2.1 Latching relay

2.2 Reed relay

2.2.1 Mercury-wetted relay

2.3 Polarized relay

2.4 Machine tool relay

2.5 Contactor relay

2.6 Solid state contactor relay

2.7 Buchholz relay

2.8 Forced-guided contacts relay

2.9 Solid-state relay

2.10 Overload protection relay

3 Pole & Throw

4 Applications

5 Relay application considerations

6 Protective relay

7 Overcurrent relay

8 See also

9 References

10 External links

When a current flows through the coil, the resulting magnetic field attracts an armature that is mechanically linked to a moving contact. The movement either makes or breaks a connection with a fixed contact. When the current to the coil is switched off, the armature is returned by a force approximately half as strong as the magnetic force to its relaxed position. Usually this is a spring, but gravity is also used commonly in industrial motor starters. Most relays are manufactured to operate quickly. In a low voltage application, this is to reduce noise. ..."

Further Data On Term for spdt relay
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