White-Rodgers 90-171 Contactor

The White-Rodgers 90-171 Contactor is a heavy-duty, 3 pole 40A 120V contactor engineered for precise control in central air conditioning and commercial heating systems. As a critical component for inductive loads, this definite purpose contactor features a 120 VAC coil with a nominal power consumption of 4.5 VA and a maximum inrush of 52 VA, ensuring efficient switching under high-demand startup conditions. The silver cadmium oxide contacts are designed for a 3PST-NO (Triple Pole, Single Throw, Normally Open) configuration, providing a double-break mechanism for positive make-and-break cycles. With a DC resistance of 180 Ohms and a low 37 mA current draw, this unit reduces coil heat and extends the life of internal electronics. The 90-171 White-Rodgers includes a protective dust cover to prevent debris accumulation on the contacts and an interchangeable mounting plate for versatile installation in any orientation. Rated for up to 600 VAC, it is a reliable choice for 40-amp inductive and 50-amp resistive loads in professional HVAC settings.

• High-Amperage Capacity: Rated for 40A inductive and 50A resistive loads, suitable for demanding HVACR equipment.
• Enhanced Protection: Integrated dust cover prevents environmental contaminants from pitting or fouling the contacts.
• Efficient Coil Performance: Low wattage 120V coil with 180 Ohms resistance minimizes energy waste and heat buildup.
• Universal Mounting: Features an interchangeable mounting plate and allows for any-position mounting to accommodate tight control boxes.
• Robust Construction: Built with high-quality thermosetting resin insulators and Class B (130°C) insulation for long-term electrical stability.

Can the 90-171 be used to replace a 2-pole contactor?
While a 3-pole contactor can technically switch two lines of power by leaving one pole unused, always verify that the physical dimensions and coil voltage align with the original equipment manufacturer's specifications.

What is the difference between inductive and resistive ratings on this unit?
The 40A inductive rating applies to motor loads (like compressors), while the 50A resistive rating applies to non-motor loads (like electric heat strips). Ensure your load type does not exceed these specific limits.

Is this contactor compatible with 24V control circuits?
No, this specific model requires a 120V control signal to the coil. If your thermostat or control board outputs 24V, you must use a contactor with a 24V coil instead.

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.