Builtin Magnetic Contactor with 24V coil, powered by an internal 230V to 24V transformer or by external 24V irrigation controller signal 24V low voltage pilot power to pressure switch or float switch, ensuring safety; Bypass the internal 24V to use with Rain Bird , Hunter timer/zone controller Compatible replacement for Franklin Part# 2821139310 , Goulds CB50412MC Deluxe Control Box Large steel case 14.25x10.25x6.5 inches, NEMA 3 rating for indoor and outdoor use 2 x 1"/1.25" tangential knockouts for power, 1x 1/2" for pilot signal Works with your own remote control device, pressure switch, float switch, irrigation controller, timer to power On/Off the pump Terminal strip accept up to #4 wire Tuhorse 5HP 230V 1-Phase Deluxe Control Box is made for using with the major North America branded single phase (1-ph) submersible motors in the deep well pump industry. It is a compatible replacement for Franklin part# 2821139310 , Goulds CB50412MC and Pentek Sta-Rite SMC-CRP5021 etc. Here is some advantage in the design for the Tuhorse Deluxe Control Box: 1) The pressure switch, float switch or other pilot control switch does not require power. The contactor coil is powered by an internal 24V transformer. 2) It uses a insolation transformer to separate the high voltage(230V) and the low voltage(24V) to further increase safety for the control circuit. 3) Low amp control current going through the pressure switch, float switch means no longer need to install a very thick gauge wire to the pressure / float switch. This reduces the chance having electric short circuit in the conduit or the berried wires. Increase the liability of the system and lifespan of the pressure switch. A toggle switch, remote switch and a timer switch can also be used as pilot signal to control the pump.