Watlow G3J77 Cartridge Heater

The Watlow G3J77 cartridge heater delivers 250 watts of continuous heating at 120 V in a compact insert-style package, featuring a 3/8 inch heater diameter, a 3.5 inch overall length, and 10 inch lead wires for flexible installation in tight equipment spaces. Built for reliable electric heat transfer and precise temperature management in demanding industrial environments, this cartridge heater maintains stable temperatures across packaging machinery, molds and dies, industrial ovens, and other manufacturing equipment where consistent heat distribution is critical. Designed for retrofit and maintenance applications, it supports heater replacement and thermal system upkeep, with insert-style mounting that simplifies installation in compact assemblies and minimizes downtime during process upgrades or routine servicing. The part is commonly cited as a replacement option alongside Chromalox, Tempco, and Omega cartridge heaters, underscoring its compatibility with standard industrial heat-transfer specifications used in plastic processing, sealing equipment, tooling, and thermal processing systems.