it precisely modulates water flow to maintain stable head pressure

the X9117B6B is the correct internal replacement

Integrated Logic: Dual internal switches allow for easy sequencing of external equipment or verification of actuator position

This line voltage thermostat features a liquid-filled sensing element and a 3/8" x 5" remote bulb

Global standards: UL

ABB ACS320-03U-08A8-4+ Variable Frequency Drive 326010-701 it precisely modulates water flowThe ABB ACS320 03U 08A8 4+ is a high performance Variable Frequency Drive specifically engineered for variable torque applications, such as HVAC pump and fan control. This 5 Horsepower 3 phase VFD operates on a 380 480Vac supply and is housed in a compact R1 Frame Size with an IP20 UL Type 0 enclosure. Designed to maximize energy efficiency, it features an integrated EMC filter (disconnected) and supports critical building automation protocols like