The unique design of the Trombetta 684-1271-012 PowerSeal DC Contactor allows it to be used in tough environmental conditions. If your application requires a sealed or submersible design, you must have the PowerSeal. Coil terminals: (2) 5/16-24 high current studs; (2) non-grounded 10-32 studs; 100% continuous duty; copper contacts; sealed design; flat, long L-bracket. Sealed design protects against dust and water jets.