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The obsolete HVMH305200 was offered into the early '90s and was replaced by the HVMB305200 which has an improved switch and mech with higher Fused fault closing rating at 63k vs. 40k. . Both had the same dimensions ......66"h x 25.5"w x 25.25"d but the former was offered in Nema 1 or 3r boxes and the present is a Nema1/3R box.