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The McDonnell & Miller SWA150S Snap Switch is a practical replacement for 150S and 157S switches. It includes both the 2-wire and 3-wire switch, ensuring reliable performance for your equipment.
This replacement switch provides dependable and long-lasting performance for HVAC systems, particularly in low water cut-off (LWCO) applications. It's ideal for maintaining and restoring the functionality of your existing McDonnell & Miller systems.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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