Answering the common buyer question: which 24V fan relay offers reliable switching for HVAC, furnace, or fan-control projects? This guide highlights five capable options, explains who they’re best for, and compares key features to help you choose confidently. Ideal for homeowners, HVAC technicians, and DIY enthusiasts, these relays balance durability, coil voltage, and contact forms to suit a range of applications.
| Product | Brand | Coil Voltage | Contacts | Best For |
|---|---|---|---|---|
| Supco 90380 General Purpose Fan Relay | Supco | 24 V | SPST-NO, SPST-NC, SPDT 1 NO/1 NC | Versatile, general-purpose control |
| 90370 General Purpose 24V AC Relay | LVACODV | 24 V AC | SPDT | Medium-to-heavy loads, reliable fan control |
| FrigeSwift 90380 Heavy Duty Switching Fan Relay | FRIGESWIFT | 24 V AC | 2-Pack, heavy-duty | Broad HVAC compatibility |
| Dreyoo 24V Fan Relay | Dreyoo | 24 V | SPST | UL-certified switch solution |
| SZRKRLA 2 Pack 24V Fan Relay | SZRKRLA | 24 V | SPST | Isolated relays for HVAC systems |
Supco 90380 General Purpose Fan Relay Overview
The Supco 90380 is a general-purpose 24 V relay suitable for fans and related controls. It supports multiple contact forms, including SPST-NO, SPST-NC, and SPDT with 1 NO/1 NC. This flexibility makes it a good choice for projects requiring either simple on/off control or a changeover configuration. It is best for electricians and DIYers seeking a compact, versatile relay for light to moderate fan-control tasks. A potential limitation is that datasheet specifics on coil current and mechanical life are not provided here, so verify compatibility with your load before use.
LVACODV 90370 General Purpose 24V Relay
The LVACODV 90370 is designed for reliable fan control in electromechanical setups. It offers a 12A load rating with 24V AC coil operation and flexible SPDT contact forms. This makes it better for medium-to-heavy duty applications where stable switching is essential. Best for HVAC controllers, fans, and other equipment requiring dependable performance under continuous operation. Caution: confirm coil voltage compatibility with your control circuit to avoid miswiring or power issues.
FrigeSwift 90380 Heavy Duty Switching Relay
The FrigeSwift 90380 is a heavy-duty 24V AC relay sold as a two-pack, designed for broad HVAC compatibility and durable performance under demanding conditions. It supports operating temperatures up to high levels and is suitable for replacing a range of brands, including common ones in HVAC systems. Choose this if you need multiple relays for a larger control panel or for a retrofit project. Limitation: the listing emphasizes compatibility and durability; exact coil current and electrical ratings should be checked against your system requirements.
Dreyoo 24V Fan Relay for Goodman and More
The Dreyoo 24V Fan Relay is a UL-certified 90-380 isolation relay used for fan control, compatible with Goodman blowers and various HVAC components. It’s a solid choice for systems requiring a dependable 24V SPST switch with straightforward installation. It’s best for those who need a simple, UL-certified solution with reliable electrical isolation. Limitation: the product description highlights broad compatibility; verify the exact contact form and load rating for your specific device before purchasing.
SZRKRLA 2 Pack 24V Fan Relay Isolation
The SZRKRLA 2 Pack provides isolated 24V relays designed for HVAC and fan-control tasks. These SPST relays emphasize compatibility with many systems and offer a robust metal construction with corrosion resistance. They’re best for projects where isolation from the control circuit is important and multiple relays are required. A caveat: theoretical long-term performance depends on the load and environmental conditions; ensure enclosure and cooling meet your use case.
Buying Guide: How To Choose The Right 24V Fan Relay
What coil voltage and contact form do you need? For fan-control tasks, a 24V coil ensures compatibility with most control boards and thermostats. SPST relays are simplest for on/off fan control, while SPDT or DPDT types offer more complex switching options. Consider load current (amps) and contact ratings to prevent overheating or premature wear.
- Load Compatibility: Match the relay’s amperage and voltage ratings to your fan or control circuit to avoid failure under heavy startup currents.
- Contact Form: Choose SPST for straightforward on/off control; SPDT for a changeover switch; DPDT for two separate circuits in one relay.
- Coil Voltage: Ensure your control system outputs near-constant 24V to avoid chatter or unresponsive switching.
- Durability and Environment: For harsh environments, prefer relays with sturdy housings, adequate isolation, and high-temperature tolerance.
- Physical Size and Mounting: Confirm fit within your equipment chassis or control panel and verify terminal compatibility.
Frequently Asked Questions
- What is a 24V fan relay used for?
It acts as an electrically controlled switch to turn fans or fan-related devices on and off in HVAC, furnace, or control-panel applications.
- What’s the difference between SPST and SPDT relays?
SPST provides a single on/off contact, while SPDT offers a common terminal with normally open and normally closed contacts for more switching options.
- Can I use a 24V AC relay with a DC control signal?
Most 24V relays are designed for AC coils; check the coil type and confirm compatibility with your control system before wiring.
- How do I choose the right amp rating?
Match the relay’s amp rating to the highest current your fan or device will draw, including startup surge, to prevent contact welding.
- Is UL or CSA certification important?
Yes. Certifications indicate compliance with safety standards, which is beneficial for reliability and code conformance.