Rheem-Ruud 42-19737-01 Sequencing Relay

The Rheem-Ruud 42-19737-01 Sequencing Relay is a critical HVAC control component engineered for precise load management in electric furnaces and heat pump systems. As a 24V DPST-NO sequencing relay, this unit utilizes Double Pole Single Throw – Normally Open logic to staged-start heating elements or blowers, preventing the excessive amperage spikes typically associated with simultaneous equipment activation. Designed as a direct OEM replacement part, it ensures seamless integration and timing consistency within 24V AC low-voltage control circuits.

For technicians servicing Rheem or Ruud air handlers, the 42-19737-01 provides the robust switching capacity required for high-demand residential applications. Its sequencing relay logic optimizes energy efficiency by controlling the timing of internal components, while the durable contact construction maintains circuit integrity over frequent cycles. When replacing a failed HVAC sequencer, utilizing this genuine Rheem-Ruud electrical relay ensures that the system’s original performance duty cycle remains within manufacturer parameters.

• Precise Load Staging: Stabilizes the startup sequence of heating elements to prevent circuit overloads.
• OEM Compatibility: Specifically calibrated for Rheem-Ruud air handler parts and furnace control systems.
• Optimized 24V Logic: Operates efficiently on standard 24V AC thermostat circuits with DPST-NO reliability.
• Durable Switching: Built for high-frequency operation in demanding heating and cooling environments.
• Reduced Maintenance: Replaces worn sequencers to eliminate delayed heating or blower failure issues.

• What is the primary function of the 42-19737-01 in a furnace? This relay manages the sequential engagement of heating coils, ensuring they do not all power on at the exact same instant, which protects your electrical service.
• Is the 42-19737-01 a direct replacement for 24V sequencers? Yes, provided the system requires a DPST-NO (Double Pole Single Throw – Normally Open) configuration and operates on a 24-volt control signal.
• How do I verify if this sequencing relay is failing? Symptoms often include heating elements staying on too long, failing to engage in the correct order, or the blower motor not starting after the heating cycle initiates.

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.