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I dont even trust a 40amp relay for a decent electrical fan,
I use 2x 40 amp relays per electric fan.
Because one may seem to carry the load fine at first. But if you touch it, a general relay, it will be hot. The relay over time will begin to melt. Its like that 40 amp rating isn't meant for constant current... or the wires are just too small to support 40 actual amps. I've seen the same thing with fuel pumps that only pull 20 or 30 amps still melt a 40 amp relay somehow.
Now my fuel pumps get 60 amp relay and the fans get either a 60 or double 40's
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