# 1A relay replace by IGBT

Is it possible to use IGBT to replace a relay , previous i use EV-200 (1A relay) to switch DC 600V 500A like the pic below

Now i want to use IGBT to replace, but i have no idea about how it be just switch for single stage voltage

I'm gonna use FF400R07KE4 IGBT module

Thanks for any advice and suggest first !

• Try the search term "solid-state relay". – Hearth Jan 22 at 4:55
• DC 600V 500A relays are called "Contactors", not relays due to arc suppression technology. And it is ridiculous to consider an IGBT at this power level if you have never done it at low levels. REad Mitsubishi App Notes – Sunnyskyguy EE75 Jan 22 at 5:05

At 500A the voltage drop is around 2V according to the datasheet. So the IGBT will continuously produce 1KW. The thermal resistance $$\R_{th,JC} = 0.12 K/W\$$ means that the junction temperature will be 140°C (already too hot for reliable long-term operation), even if you somehow keep the IGBT case at 20°C (ideal cold plate emlpoying e.g. two-phase cooling or heat pipes).
Paralleling IGBTs would help a little bit in terms of losses and allow better cooling, but would also increase cost significantly. E.g. two such IGBTs in parallel will have a voltage drop of around 1.3V, resulting in total losses of 0.65kW during operation (325W per IGBT) which you could cool with a heat sink of size around $$\V_{HeatsinkPlusFan} = 5 dm^3\$$ employing forced convection.