I'm struggling to find clarity on some of the listed specs of a relay, in particular the difference between all the voltage terminologies used i.e. nominal voltage, coil voltage, contact voltage, switching voltage, control circuit voltage etc.
My understanding is as follows (please correct me if I'm wrong):
- Nominal voltage = coil voltage = supply voltage = input voltage
- Contact voltage = secondary voltage = switching voltage = control circuit voltage = output voltage
- The voltage listed in the name of a relay (like below) is the output voltage
If my understanding is correct then my confusion comes from when the relay such as the relay above is labelled a 24VDC relay, but then its maximum switching voltage is listed as 30VDC and its rated operational current is listed as 5A @ 30VDC as can be observed here
The reason for my concern is that I'm trying to power a 24VDC solenoid valve with this relay, but I don't want to be switching 30VDC to the solenoid valve as it's only rated at 24VDC. Therefore, if someone could help clear this up for me it would be much appreciated. Thanks