White-Rodgers 24A05Z-1 Relay

The White-Rodgers 24A05Z-1 is a professional-grade Level-Temp Electric Heat Relay engineered for the silent switching of high-wattage line voltage loads via low voltage thermostat control. This SPST normally open operator is specifically designed for 277V applications, supporting up to a 6000W resistive load at 22A, making it a standard choice for technicians servicing commercial baseboard heaters, radiant panels, and duct heaters. The built-in 45-second time delay is integrated to prevent nuisance cycling, allowing for a sequenced startup that protects the electrical service and extends the life of terminal heating elements.

This silent operator relay features a self-contained transformer and bimetal heater design that eliminates the "clack" common in traditional magnetic contactors, which is critical for noise-sensitive environments like offices and residential corridors. Installation is versatile with a 1/2" conduit hub and universal break-off mounting tabs, allowing for secure attachment to standard junction boxes. For multi-load configurations, these units can be easily sequenced together to provide staggered activation of multiple heating banks from a single low voltage 2-wire thermostat.

Key Benefits for the Contractor

• Silent Switching: Eliminates contactor noise through bimetal thermal action, perfect for quiet-zone heating applications.
• Sequencing Logic: Features a thermal 45-second delay to stagger large amperage loads and reduce inrush current.
• High Capacity: Rated for a 22A resistive load at 277 VAC, handling up to 6000 watts of heating capacity.
• Flexible Mounting: Equipped with a 1/2" threaded conduit hub and break-off tabs for non-critical mounting angles.
• Integrated Control: Combines a line-to-low voltage transformer and relay in a single housing for faster hookups.

Common Questions & Technical Support

Can the 24A05Z-1 be used with any 24V thermostat?
Yes, it is compatible with standard low voltage 2-wire thermostats. Ensure the thermostat heat anticipator is set to 0.2A for optimal timing.

Why is there a delay before my heating element turns on?
The internal bimetal heater requires approximately 45 seconds to warp and close the line voltage switch. This is a deliberate design feature to prevent rapid cycling and protect the power distribution system.

Can I mount this relay in any orientation?
Yes, the White-Rodgers 24A05Z-1 uses a non-critical mounting angle, allowing it to function reliably regardless of position within the junction box or heater cabinet.

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.