Relay and the surge current

Hello All,

I need to run non-repetitive high current pulses (~1kA, ~100us) through the contacts of the conventional electromagnetic relay.

How can I estimate the safe limit (t*I^2 or something else) for the relay contacts?

The contacts are closed during the surge. No switching at that time.

In the datasheets for the relays, they always provide only the maximum current limited by arching when switching.

Can we suggest that a relay rated at 10A, 220V will sustain eventual pulses of 1kA x 100us ?

Any ideas?

Vladimir Vassilevsky

DSP and Mixed Signal Design Consultant

http://www.abvolt.com
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