and "30" represents the differential

The 56L68 is a Single Pole Double Throw (SPDT) relay

please verify if your sensor uses 1/2" NPT or the common 1/2" NPSM/18-NEF thread found on adjustable-angle thermometers

first verify static pressure and temperature rise across the heat exchanger before replacing the switch

Whether you are performing a retro-fit or a necessary repair

Functional Devices RIB RIBX24SBF Sensor Relay Els PW 17895 and "30" represents the differentialThe Functional Devices RIBX24SBF is a versatile enclosed current sensing relay designed for reliable load monitoring and control in commercial HVACR environments. This unit features a split core current sensor capable of detecting 0. 25 to 20 Amp ranges, paired with an SPDT relay rated for 10 Amps. The RIBX24SBF is engineered with a built in Hand Off Auto (HOA) override switch, allowing technicians to manually bypass the sensor for system testing or