Square D 9038CG31 Closed Tank Mechanical Float Switch

Square D 9038CG31 is a closed-tank mechanical alternator float switch designed to sequence two pumps or motors in a duplex tank, switching one load as liquid level rises to balance duty cycles. This 9038C family device accepts 575 V AC input and uses two poles with DPST-style contacts configured for a close-on-rise action; distributor listings commonly describe it as DPST‑4NC. The unit mounts via a 2.5 in. NPT screw-in bushing and features a 90° offset float rod for right-hand installation in a closed-tank application; the float is stainless steel and the assembly is rated for temperatures from -22 to 220 °F (-30 to 104 °C) with a NEMA 1 enclosure. Typical use cases include duplex tank systems where two pumps share duty and run times are balanced to extend motor life. Note that for 9038CG31, float and rod assemblies are separate components with specific part numbers required by Schneider Electric; UL and CSA listings are common for this product family, providing standard safety approvals.