Passives

Three Phase Solid State Relays & Their Application in Three Phase Motor Circuits

9th July 2010
ES Admin
0
Three phase Solid State Relays (SSRs) have been available since shortly after the introduction of Single Phase SSRs in 1970. The first of these relays were nothing more than 3 individual SSRs with a common input connection packaged in a single housing.
This basic design concept remains, for the most part, unchanged today. However, even though the function of single-phase and three phase relays are quite similar, their applications can vary significantly. This is primarily due to the characteristics of three phase power circuits and the attributes/ demands of three phase loads, particularly inductive loads.

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