Foot Mount Control Class II Transformer 120V / 208V / 240V, PF 42440

HVAC/R Foot Mount Control Transformer | Replaces Supco® SXT115

Brand new Supco (SXT115) Class II Foot Mount Control Transformer designed for HVAC/R applications. Replaces multiple OEM transformer models including 4031F, 50354, and PF42440. Built to supply stable 24V control power for heating, cooling, and refrigeration systems.

This transformer provides reliable low‑voltage output for thermostats, relays, gas valves, and control circuits. Includes two 12" leads with 1/4" insulated female quick‑connect terminals for easy installation.

⚙️ Specifications

• Primary Voltage: 120V / 208V / 240V
• Secondary Voltage: 24V
• VA Rating: 40VA
• Mount Type: Foot Mount
• Class II Rated
• No internal breaker or fuse
• Includes two 12" leads with 1/4" insulated female quick connects
• Agency Approvals: UR, CSA
• Condition: Brand New – Unused

⚠️ Symptoms This Part Fixes

• No 24V output to control circuits
• HVAC system not powering up
• Blown or shorted transformer
• Intermittent or unstable control voltage

Replaces Part Numbers

4031F
50354
PF42440
SXT115

Replacement For

Jard 4031F
Mars 50354
UEI UET115
White‑Rodgers 90‑T40F3
Honeywell AT40A1121
Honeywell AT40A1139
Honeywell AT40B1214

Restore dependable 24V control power with this OEM‑compatible SXT115 Class II transformer — engineered for long‑lasting performance in HVAC/R systems.