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Questions related to the maximum ratings of a component such as maximum voltage, heat and other specs which if exceeded will likely destroy the device
14
votes
Relay contact (switching) voltage
When you're dealing with voltages that high, the biggest challenge for a relay is snuffing the arc. The arc is proportional to voltage.
As a relay opens, voltage will arc across the contacts. Tha …
5
votes
Why do contactors have lower withstanding current for signaling than power circuits?
Because these are different tiers of contacts
These aren't different ratings for different signals on the same contacts. These are a totally different set of (auxiliary/signaling) contacts.
You'll h …
1
vote
The meaning of KVA in single phase transformers
kVA literally means
k - kilo (1000)
VA = volt-amps, a unit of power similar to watts used for provisioning power
It is a unit used in the electrical industry (utilities and electricians doing mains …
0
votes
Non Fused AC Rated Disconnect Switche for DC System
No, you can't just presume that. You need to actually read the nameplate and instructions and see what the disconnect is rated for.
DC, particularly in voltages above 30 volts or so, is much more dem …