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 | | Relays, Gas-Filled |
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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 |
| GIGAVAC |
| Jennings Technology Corp. |
| Magnecraft |
| Ross Engineering Corp. |
| Tyco Electronics Corp. |
| Books |
Combustion Engineering and Gas Utilisation
British Gas
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Gas Engineers Handbook
American Gas Association
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Valve and Transistor Audio Amplifiers
John Linsley Hood
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| Excerpt - page 39: "... type of loudspeaker protection, such as a high quality, inert gas filled relay, with adequately sized, gold-plated contacts, or, alternatively, some purely electronic ..." | | See more references to Relays, Gas-Filled in this book. |
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Valve Radio and Audio Repair Handbook
CHAS MILLER
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| Excerpt - Back Matter: "... 222 Valve Radio and Audio Repair Handbook Table 12. Gas-filled relays Make ztype Base volts Filament amps Anode volts Anode current ..." | | See more references to Relays, Gas-Filled in this book. |
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History of Wireless
Tapan K. Sarkar, Robert Mailloux, Arthur A. Oliner, and Magdalena Salazar-Palma
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| Excerpt - page 335: "... Austria. In 1906 he obtained a patent for an inertia-less relay using a gas filled amplifier tube which can be denoted as a deflection grid ..." | | See more references to Relays, Gas-Filled in this book. |
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Data Communications Pal (Pal Series of Engineering Reference Publications)
Paul Rosenberg
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| Excerpt - page 30: "... rectifier (semiconductor) ( rectifier (silicon-controlled) l rectifier (tube-type) rectifier (tube-type, gas-filled) relay (DPDT) F-17 ~ J 1-30 ..." | | See more references to Relays, Gas-Filled in this book. |
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The Collected Essays of Milton Babbitt
Milton Babbitt, Stephen Peles, Stephen Dembski, and Andrew Mead
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| Excerpt - page 190: "... A thermionic valve (usually a triode) that functions as a gas-filled relay. Its solid-state counterpart is the silicon-controlled rectifier. (eds.) 5. For ..." | | See more references to Relays, Gas-Filled in this book. |
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Electrical Transients in Power Systems
Allan Greenwood
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| Excerpt - page 167: "... many years this function of control was carried out by gas-filled devices, notably the mercury arc rectifier, the ignitron, and the gas-filled relay or thyratron. These devices are now rarely used; instead, their ..." | | See more references to Relays, Gas-Filled in this book. |
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Principles of Space Instrument Design (Cambridge Aerospace Series)
A. M. Cruise, J. A. Bowles, T. J. Patrick, and C. V. Goodall
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| Excerpt - page 287: "... crack the glass. This is particularly important with hermetically sealed, gas filled relays, where vacuum operation could cause cold welding to occur. Wire ..." | | See more references to Relays, Gas-Filled in this book. |
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