SSR Solid State Relays User's Guide

PublishTime：2022-06-20

The OMEGA® Solid State Relays (SSR's) are a series of single-pole, normally open, solid state switching devices with no moving parts, capable of tens of millions of cycles of operation. It is designed to control 120V, 240V or 440V alternating current (VAC) , and provides zero voltage switching and 2500VAC isolation between the load terminals and the control signal. A control signal (AC or DC input, depending on unit selected) causes the SSR to switch the AC load ON or OFF just as a conventional mechanical contact switch does but with none of the problems associated with moving contact relays, such as corrosion, pitting, arcing, radio frequency interference (RFI) and bounce. The result: much longer life for the SSR.
The SSR is designed around a pair of SCR's mounted on a heatspreading metal base to eliminate thermal fatigue failures. To dissipate the heat developed naturally in an SSR due to a nominal voltage drop across the device, the SSR must be mounted on a Finned Heat Sink (FHS)
, or on a metal plate of adequate size (see Section 4). It is advisable to install an SSR where the ambient temperature is relatively low because its current-switching rating is decreased as its temperature increases.
Control resistance heaters up to 40kW use solid state relays in conjunction with lower-rated temperature controllers. Three-phase loads can be controlied using 2 or 3 SSR's. Use 3 SSR's for Y-phase loads using a neutral line. Three solid state relays are also used when there is no neutral load to provide redundancy and extra assurance of control. Two SSR's will control "delta"loads with no neutral line.

Brand of Product：	Omega Engineering
Part#：	SSR 、 SSR240AC10 、 SSR240AC25 、 SSR240AC45 、 SSR240AC75 、 SSR240AC90 、 SSR240DC10 、 SSR240DC25 、 SSR240DC45 、 SSR240DC75 、 SSR240DC90 、 SSR440AC50 、 SSR440AC75 、 SSR440AC90 、 SSR440DC50 、 SSR440DC75 、 SSR440DC90 More Part#
Product Category：	Solid State Relays More
Application：	More
Data Type：	User's Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	0399
Version Number：
Data Encoding：	M0089
Data Size：	291 KB

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