Relays
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Miniature plug in relays.
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Safety relays.
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Programmable relays.
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According to USASI (United States of America Standards Institute) a relay may be defined as an electrically controlled device which opens and closes an electrical circuit in order to affect the operation of other devices in the same or another circuit. Relays are a significant element in the contemporary industrial processes. Dozens of milliards of relays operate nowadays in the world as an interface between control circuits and electrical load. The technological development has brought miniaturization of mono-, bi- and tri-stable relays that need a low or even no supply voltage to carry a high power through the contacts.
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There are two kinds of the device, i.e. electromechanical relay and solid-state relay (SSR). In the case of an electromechanical relay, there is a high level of isolation between the open contacts while switching which not the case with SSR. This means different approaches to the issue of safety. However, there is no contact vibration in SSR (no moving parts), and the switching time is very short. Moreover, the relation between the cost of the device and the switched power is much less advantageous for SSR than for the electromechanical relay. The SSR has been invented for special applications where high switching frequency with no contact wear is important.
Location:  /Timer & Relay/Relay
Relay
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