The best replacement for nema 12 is nema 4.

The best alternatives to nema 12 are rated as following:
★★★★★  nema 4
★★★★  nema 1
★★  nema 3r
★  ip54
★  nema 4x
★  4x
★  nema 1a
★  ip 54
  ul type 12

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