Hartland Controls 90340 Relay

The Hartland Controls 90340 Relay is a heavy-duty, field-proven solution for switching fan motor loads and managing auxiliary circuits in residential and commercial HVAC systems. As a veteran-grade DPDT 24V relay, this unit features a 24 VAC coil designed for seamless integration with standard 24V control loops. Engineered for reliability, the 90340 general purpose relay utilizes double-pole, double-throw switching to provide independent control of two separate circuits, making it an essential component for isolating high-voltage motor windings from low-voltage thermostat signals.

This 2-pole switching relay is commonly utilized in electric furnaces, heat pumps, and air conditioning units to manage leaf/lag blower speeds or to interlock electric heat strips. With a contact rating capable of handling up to 15A inductive loads and .250-inch quick connect terminals, it ensures a secure, high-conductivity interface for professional-grade field wiring. Its multi-positional mounting bracket allows for flexible installation in tight control cabinets, while the Class B insulation system ensures stable performance under high-duty cycles and thermal stress.

• Inductive Load Management: Rated for up to 15 Amps to securely switch blower motors and compressors without contact welding.
• Circuit Isolation: DPDT configuration allows for the safe separation of independent power sources or multi-speed motor windings.
• Universal Compatibility: A standard truck-stock part that serves as a direct cross-reference for various OEM and aftermarket fan relays.
• Efficient Installation: Integrated mounting bracket and industry-standard spade terminals simplify replacement and minimize system downtime.

• Can this relay replace a single-pole (SPDT) model? Yes, you can use a DPDT relay in place of an SPDT by only utilizing one set of contacts, provided the coil voltage and amp ratings match.
• What is the purpose of the NC (Normally Closed) contacts on this unit? In many HVAC applications, the NC contacts are used to power a low-speed motor winding or a fail-safe circuit when the 24V coil is de-energized.
• Will this relay work with DC control systems? No, the 90340 is specifically designed with a 24 VAC coil; using it in a DC circuit will lead to improper actuation or coil failure.

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.