Begin with the motor nameplate
Record the phase, voltage, full-load current and power from the pump motor nameplate. Add the existing starting arrangement and the site supply conditions. The agricultural catalog organizes products by motor rating and relay range, but HP alone is not enough to match a starter. A replacement should preserve the required protection and control functions.
Separate starting method from control features
DOL and star-delta describe starting arrangements. Water-level control, phase monitoring, dry-run protection and mobile operation are additional functions that vary by model. Confirm which are built into the selected controller and which require accessories. Do not assume every MU-G or SMART variant includes the same hardware.
Match the controller to the job
A tank-filling installation may need level-based operation. An agricultural installation may need remote status and control. A multi-zone irrigation project may require valves, field sensors and an irrigation master, rather than a standalone pump starter alone. The agricultural and irrigation catalogs overlap, so build one coordinated bill of materials.
Specify the complete assembly
Include the controller, relay range, control voltage, capacitor specification for applicable single-phase systems and any required sensors or modules. For a replacement, provide the old model number and motor details. Ask the installer to verify protection settings and operation during commissioning.
Explore the products & sources
This guide draws on the supplied manufacturer catalogs. Exact specifications and available variants should be checked against the selected model.