White-Rodgers S84Z-90 Transformer

The White-Rodgers S84Z-90 is a versatile 40VA Class 2 transformer engineered for reliable 24V control circuit power in heavy-duty HVACR and industrial applications. This multi-tap transformer features a tri-voltage primary (120/208/240V AC), allowing you to stock a single unit for a wide range of field service requirements. Designed with a skeleton frame and universal mounting options—including hub, plate, and foot mounts—it provides the flexibility needed for tight control cabinets and complex retrofit configurations.

For high-performance voltage regulation, the S84Z-90 utilizes 10-inch color-coded leadwires on the primary side and combined screw terminals with quick-connect tabs on the secondary side, ensuring secure electrical continuity. This multi-mount step-down transformer is a critical component for powering 24V contactor coils, low-voltage thermostats, and automation panels. Its energy-limiting design meets Class II standards, mitigating risks of overheating and circuit damage under fault conditions in 60Hz systems.

• Universal Compatibility: The 120/208/240V input makes this a "truck stock" essential for servicing various residential and light commercial equipment.
• Flexible Installation: Multiple mounting configurations (foot, plate, or hub) ensure the S84Z-90 fits into virtually any existing enclosure or panel.
• Durable Construction: Built to withstand ambient conditions up to 150°F, ideal for rigorous HVAC furnace or boiler environments.
• Simplified Wiring: Features long 10-inch leads and quick-connect terminals to reduce onsite labor time during transformer replacement.

Can I use this to replace a transformer with a lower VA rating?
Yes, as long as the primary and secondary voltages match, a 40VA transformer can replace a 20VA or 30VA unit to provide a more robust power overhead for additional controllers or relays.

How do I select the correct primary voltage tap?
Always verify your line voltage with a multimeter. Use the white common lead paired with the specific color-coded lead for your 120V, 208V, or 240V source as indicated on the wiring diagram.

Is the S84Z-90 suitable for damp environments?
This is a skeleton-style transformer meant for installation within a protected electrical NEMA enclosure or furnace cabinet to prevent exposure to direct moisture.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.