|
|
|
|
|
|
|
Register now to update your company and product listings (free)
 | | Relays, Current Sensing |
|
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.
|
| Bronze Partners |
| Absolute Process Instruments, Inc. |
| Airotronics |
| Aleph International Corp. |
| Allen-Bradley |
| Allied Controls Acquisition Corp. |
| Altech Corp. |
| Amecon, Inc. |
| American Aerospace Controls, Inc. |
| American Electronic Components |
| American Relays, Inc. |
| Americor Electronics, Ltd. |
| Amperite Co. |
| Arga Controls |
| Aromat Corp. (Matsushita Electric Works, America) |
| Babcock, Inc. |
| Carlo Gavazzi Automation Components |
| CII Products |
| Clare Inc. |
| Coto Technology |
| CR Magnetics Inc. |
| Crouzet |
| Cutler-Hammer |
| CyberResearch, Inc. |
| Danaher Controls |
| DARE Electronics, Inc. |
| Deltrol Controls |
| EAC Electronics Co. |
| Eaton Corporation |
| EI & S Elctrn. Instrs. & Spec. Div. |
| Electrodyne, Inc. |
| Flex-Core Division |
| Greenwich Electronics |
| Hamlin |
| Hartman Products |
| Hasco Components International Company |
| Hoyt Electrical Inst. Works, Inc. |
| ICS, Inc. |
| Jaidinger Mfg. Co., Inc. |
| Jennings Technology Corp. |
| Jopp Associates |
| Larson-Metercraft Inc |
| Leach International |
| Line Electric Products |
| Macromatic Controls |
| Magnecraft |
| Master Electronic Controls (MEC) |
| MEDER electronic Inc. |
| Midtex Products |
| Moeller Electric Corp |
| North Atlantic Industries |
| Philips ECG |
| Picker Components |
| Pontiac Coil-Arkansas |
| Relay Service Company |
| Rockwell Automation |
| Semitronics Corp |
| Sky Electronics, Intl. |
| Solidyne |
| Song Chuan USA, Inc. |
| SRC Devices |
| SSAC Inc. |
| STK Electronics, Inc. |
| Sumida America |
| SymCom, Inc. |
| Time Mark Corp. |
| Triridge Corp. |
| Weidmuller Inc. |
| Wieland Electric Inc. |
| Wilkerson Instrument Co. |
| Books |
Land Observation by Remote Sensing (Current Topics in Remote Sensing, Vol 3)
Buiten
|
|
Remote Sensing and Image Interpretation
Thomas M. Lillesand, Ralph W. Kiefer, and Jonathan W. Chipman
|
|
Forced Hot Air Furnaces
Roger Vizi
|
| Excerpt - page 108: "... If no such terminal is available, you will need a current-sensing relay (on Lennox units this is Part Number 26G12) so that ..." | | See more references to Relays, Current Sensing in this book. |
|
Electronic Troubleshooting
Daniel R. Tomal, Neal S. Widmer, Daniel Tomal, and Neal Widmer
|
| Excerpt - page 99: "... device could turn on and injure the troubleshooter when the relay cools down and resets. Overload ... are available in several different current ratings. Accessories include ambient temperature ... popular. This multipurpose overload and direct-current-sensing relay is designed for do motors (Fig. 4.9). When a ..." | | See more references to Relays, Current Sensing in this book. |
|
The Basement Bugger's Bible : The Professional's Guide to
Shifty Bugman
|
| Excerpt - page 141: "... 400 ohms of resistance in series with this voltage limits current to 120 ma in the event of a dead short. Loop resistance and phone resistance limit actual loop current. If this falls below 25 ma, current-sensing relay may return to on-hook condition. Telco circuits isolated from subscriber ..." | | See more references to Relays, Current Sensing in this book. |
|
Technician's Guide to Refrigeration Systems
John A. Corinchock
|
| Excerpt - page 265: "... = ORANGE BR = BROWN OZO 3 7 q >CURRENT SENSING RELAY CONTACTS REL AY P = PURPLE B - BLACK A ..." | | See more references to Relays, Current Sensing in this book. |
|
Standard Handbook of Plant Engineering
Robert C. Rosaler
|
| Excerpt - page 460: "... and runs as an induction motor. In some designs a current-sensing relay is used instead of a centrifugal switch. Capacitor-Start Motors. Capacitor-start ..." | | See more references to Relays, Current Sensing in this book. |
|
Vehicular Electric Power Systems (Power Engineering, 22)
Ali Emadi, Mehrdad Ehsani, and John M. Miller
|
| Excerpt - page 69: "... was implemented in the DC generator first by a single current sensing solenoid and later by a combination of three relays. A current sensing relay was in reality a linear solenoid ..." | | See more references to Relays, Current Sensing in this book. |
|
Control Techniques' Drives & Controls Handbook (Iee Power & Energy Series, 35)
William Drury
|
| Excerpt - page 49: "... has been achieved through the use of devices such as current-sensing protection relays. With converter supplies, the situation is somewhat more complex and ..." | | See more references to Relays, Current Sensing in this book. |
|
Handbook of Electrical Construction Tools and Materials
Gene Whitson
|
| Excerpt - page 387: "... however, take the place of overcurrent protective equipment. The overload relay consists of a current-sensing unit connected in the line to the motor, plus a ..." | | See more references to Relays, Current Sensing in this book. |
|
|
|
|
|
|
|
