Trane SWT03623 is a low pressure cutout switch for HVAC systems that shuts the unit down to prevent damage when pressure drops too low. It is a specific electrical component with a 250 PSIG open pressure setting, meaning it trips when the low-pressure side reaches a certain threshold. This product protects the HVAC system by cutting power if refrigerant pressure gets too low, which can cause compressor damage.

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This Pressure switch is found in the following Trane/American Standard models: