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 | | Relays, Surface Mount |
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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 electrical amplifier.
These contacts can be either Normally Open (NO), Normally Closed (NC), or change-over contacts.
- Normally-open contacts connect the circuit when the relay is activated; the circuit is disconnected when the relay is inactive. It is also called Form A contact or "make" contact. Form A contact is ideal for applications that require to switch a high-current power source from a remote device.
- Normally-closed contacts disconnect the circuit when the relay is activated; the circuit is connected when the relay is inactive. It is also called Form B contact or "break" contact. Form B contact is ideal for applications that require the circuit to remain closed until the relay is activated.
- Change-over contacts control two circuits: one normally-open contact and one normally-closed contact with a common terminal. It is also called Form C contact.
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| Bronze Partners |
| Aromat Corp. (Matsushita Electric Works, America) |
| Coto Technology |
| Dionics Inc. |
| Fujitsu Components America, Inc. |
| Hamlin |
| Hasco Components International Company |
| MEDER electronic Inc. |
| Micropac Industries, Inc. |
| Omron Electronics LLC |
| Picker Components |
| Rsm Sensitron Semiconductor |
| Stetron International, Inc. |
| Teledyne Relays |
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