Efficiency: 0,8 for a motor < 5KW
Efficiency: 0,9 for a motor > 5KW
Power factor: 0,8 for a motor < 5KW
Power factor: 0,9 for a motor > 5KW
V3 = 1,732
Nominal current absorbed by the motor:
I = 15000 = 26,7 A
400 x 1,732 x 0,9 x 0,9
The current rating of the relay must be 4 x I of the motor in order to withstand starting currents:
>>> 106,8 A >>> it’s necessary to take a 125 A relay.
Because of their semiconductor technology-based design, SSRs provide a higher degree of reliability, longer life and reduced electromagnetic interference (EMI), as well as faster response times and vibration and shock resistance, when compared to the EMR counterparts. This is due to the fact that SSRs have no mechanical contacts to wear out or arc, which is the primary cause for EMR failure.