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First Company E133 is a transformer for MBX SRS that steps down 120V primary power to a 24V secondary for HVAC control circuits, thermostats, and control boards. It functions as a relay/step-down control transformer suitable for installation in air handlers and fan coil units and is specified as an OEM replacement for compatible First Company equipment. The compact design supports low-voltage control circuits in CDXQ series and similar units.
120V to 24V step-down control transformer for HVAC and fan coil control circuits
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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