Choosing the right air conditioner relay switch is crucial for maintaining the efficiency and reliability of your HVAC system. These switches control the electrical flow, ensuring that compressors and fans operate smoothly. Below is a comparative summary of top relay switches available on Amazon designed for automotive and HVAC applications. This guide includes products with varied features such as coil voltage compatibility, amperage ratings, and durability to help you make an informed decision.
| Product | Brand | Key Features |
|---|---|---|
| Zlirfy 2 Pack 12V Relay, 4 Pin Car Relays | Qziulr | High-quality 4-pin relay, durable in extreme conditions, easy to install |
| Dreyoo 24V 40A 2 Pole Air Conditioner Contactor | Dreyoo | UL certified, 40A/50A capacity, dust/water resistant, vibration-proof |
| Haoguo Time Delay Relay 12V Replacement Module | Haoguo | Delays fan shutdown, energy-saving, PC shell, durable welding |
| ACDelco 15-50961 Auxiliary HVAC Blower Motor Relay | ACDelco | Professional aftermarket quality, dependable fit and function |
| Weasch 2 Pcs DC 12V 40A Automotive Starter Relay | Weasch | 12V coil, 40A max current, 4-pin SPST heavy duty switch |
Zlirfy 2 Pack 12V 4-Pin Air Conditioner Relay Switch
The Zlirfy 2 Pack 12V Relay offers a durable and reliable solution for automotive air conditioning systems. Made from high-quality materials, these 4-pin relays resist deformation, rust, and damage from extreme temperatures. They are designed to replace OEM relays (such as 90987-02028) and restore proper HVAC compressor operation, preventing issues like single-speed operation or complete system failure.
Installation is straightforward, requiring only basic wire connections without extra tools. Its multipurpose application makes it ideal for cars needing a dependable starter relay for AC compressors. This set provides a cost-effective and practical replacement to keep your vehicle’s air conditioning functioning efficiently.
Dreyoo 24V Coil 40A 2 Pole Air Conditioner Contactor
The Dreyoo 24V Air Conditioner Contactor is engineered for industrial HVAC applications and commercial refrigeration systems. It features a 24V coil with 40A full load amperage and 50A resistive load capacity while meeting UL508 standards. Its hermetically sealed coil prevents moisture ingress, and silver oxide contacts provide minimal resistance, ensuring efficient power transfer and durability.
Designed to withstand harsh environmental conditions ranging from -40°F to 221°F with high humidity resistance, this contactor suits rooftop units and heat pumps. Compatibility with multiple well-known models like Mars 17421 and Siemens 45GG20AJ increases its versatility during replacements. This relay is built to last with vibration-proof terminals and Class B insulation.
Haoguo 12V Time Delay Relay Replacement Module
The Haoguo Time Delay Relay is a specialized replacement designed to delay the shutdown of the fan motor after the compressor turns off. This delay reduces unnecessary energy consumption while improving system efficiency in central air conditioners, heat pumps, and furnaces. Its robust PC shell and precise welding ensure long-lasting durability in HVAC setups.
This relay is compatible with a variety of OEM models including AHCB0251AAA0 and TCC042F100BA, making it a versatile choice for technicians. It contributes to prolonged system life by preventing premature fan motor shutdown and reducing wear on components.
ACDelco Professional Auxiliary HVAC Blower Motor Relay
The ACDelco 15-50961 Relay is a premium aftermarket option designed to replace auxiliary blower motor relays in heating and air conditioning systems. Manufactured to meet high standards, it offers dependable fit, form, and function consistent with original equipment specifications.
Its precise construction ensures consistent performance, contributing to proper air flow within the HVAC unit. Being a trusted brand, this relay delivers reliable electrical switching for blower motors, improving overall HVAC efficiency.
Weasch 2 Pcs DC 12V 40A 4 Pin Automotive Starter Relay
The Weasch 12V 40A Starter Relay is a heavy-duty automotive relay designed specifically for applications like air conditioner fans, lamps, and starters. It features a 12V coil operating at 1.8W power with a maximum operating current of 40A, capable of handling significant electrical loads.
This 4-pin SPST relay is compact yet rugged, making it suitable for vehicles requiring a strong, responsive relay switch. Its specification ensures compatibility with most automotive electrical systems, providing reliable switching power that supports effective air conditioning operation and other vehicle accessories.
Buying Guide for Air Conditioner Relay Switches
Coil Voltage and Compatibility
Ensure the relay coil voltage matches your system requirements. Common coil voltages are 12V or 24V, with automotive systems typically using 12V and commercial HVAC units using 24V. Always verify compatibility with your existing components to avoid malfunction.
Amperage and Load Capacity
Check the relay’s amperage rating—both full load amperage (FLA) and resistive load (RES). A relay should handle the maximum current your air conditioner or HVAC motor draws. Choosing a relay with insufficient capacity can lead to early failure or electrical hazards.
Durability and Environmental Ratings
Consider relays certified for environmental resistance if used outdoors or in harsh conditions. Features like dustproof, waterproof casings, vibration-proof terminals, and temperature range ratings ensure longevity and reliable switching performance.
Type and Number of Pins
The relay’s pin configuration (4-pin, 5-pin, SPST, DPDT) should fit your wiring harness and application needs. Multipurpose relays offer flexibility, but proper wiring and isolation between pins is crucial for system safety and function.
Special Features
Some relays include time delay functions to optimize fan and compressor operation, reducing wear and energy use. Consider these features if you want efficiency improvements and reduced maintenance.
Brand Reputation and Certifications
Choose well-known brands and relays with certifications such as UL or ISO to ensure quality and compliance with safety standards. Reliable brands also provide better support and replacement assurance.