Relay rating explain

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MaxHeadRoom

Joined Jul 18, 2013
26,337
You could see insulation break down when the voltage is excessive, also, breaking a voltage of that magnitude, may cause a sustained Plasma arc across the contacts, when they open.
 

crutschow

Joined Mar 14, 2008
31,151
The voltage rating is more important for when the contacts open (closed to open), then when they close (open to closed).
The contacts can likely tolerate the 300V when open but not for closed to open.

What will be the voltage when the contacts open?
 

Hymie

Joined Mar 30, 2018
1,104
If the relay is being used to discharge a capacitor (charged to 300V) into a 4Ω load, then it is likely that the relay contacts will survive such switching – whether the capacitor can withstand such a rapid change in voltage/stored energy is another thing.
 

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Marcodavid

Joined Aug 1, 2022
39
The voltage rating is more important for when the contacts open (closed to open), then when they close (open to closed).
The contacts can likely tolerate the 300V when open but not for closed to open.

What will be the voltage when the contacts open?
The relay will be a switch to coil 4 ohm, to supress the back emf, a diode will be used, so the voltage when the contacts open 300v
 

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Marcodavid

Joined Aug 1, 2022
39
If the relay is being used to discharge a capacitor (charged to 300V) into a 4Ω load, then it is likely that the relay contacts will survive such switching – whether the capacitor can withstand such a rapid change in voltage/stored energy is another thing.
Yes the relay will be switch for capacitor to discharge
Yes capacitor can discharge rapid
 

DickCappels

Joined Aug 21, 2008
9,524
You are using the word "relay" as a substitute for "solenoid". You have been evasive about what you are doing and we need to understand what you are doing before this site can assist you further. You may use the Report button contact the moderation team. This thread is locked pending discussions.
 
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