This is a heavy‑duty, fusible safety switch made by Square D (part number VH221NDSGL). It’s rated for 30 amps and 240 V AC (also 250 V DC), with 2 poles and a factory‑installed neutral. The enclosure is rated NEMA 4X (stainless steel), making it suitable for demanding environments — including potentially wet or corrosive locations. The switch includes a viewing window so you can see whether it’s open or closed without removing the cover. It supports Class H, K, R, or J fuses (field‑modifiable) and accepts AWG 14 to AWG 6 copper, or AWG 12 to AWG 6 aluminum conductors. The unit uses surface‑mounting, with lug‑type connections and ground lugs provided.