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The McDonnell & Miller SWA-150S-M switch assembly, part number 354089, is specifically designed for Series 150S and Series 157S low water cut-offs. This snap-action switch with manual reset ensures reliable operation and safety in heating systems.
Optimized for both Series 150S and 157S applications, ensuring compatibility and ease of use. Its manual reset feature provides an additional layer of safety, requiring direct interaction for system restarts after fault conditions.
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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