
686720000515 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $28.95 | Condition is New, Aprilaire / Research Products Model No. 51 Current Sensing Relay 120VAC 50 W, FREE SHIPPING | 100.0% |
![]() | $30.00 | Condition is New, Aprilaire / Research Products Model No. 51 Current Sensing Relay 120VAC 50 W, FREE SHIPPING | 100.0% |
![]() | $25.00 | Condition is New, Aprilaire Model No. 51 Current Sensing Relay 120VAC 50 W 686720000515, shipping cost = $10.95 | 99.2% |
![]() | $37.99 | Condition is New, Aprilaire Model No. 51 Current Sensing Relay 120VAC 50 W 686720000515, FREE SHIPPING | 99.7% |
![]() | $83.59 | Top Pick! Condition is New, AprilAire 51 Relay 120V AC Current Sensing Humidifier Control Compact Design, FREE SHIPPING | ![]() |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $19.95 | Condition is Used, APRILAIRE Model 51 - Humidifier Current Sensing Relay 120V, shipping cost = $8.60 | 100.0% |
![]() | $24.99 | Top Pick! Condition is Used, AprilAire / Model 51 / Current Sensing Relay 120V, shipping cost = $4.99 | 99.1% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $30.00 | Condition is New – Open box, Aprilaire Model No. 51 Current Sensing Relay 120VAC 50 W 686720000515, shipping cost = $8.00 | 100.0% |
![]() | $45.00 | Condition is New – Open box, Genuine Aprilaire 50 Current Sensing Relay 120V, shipping cost = $5.62 | 100.0% |



The Aprilaire 686720000515 51 120 Volt Sensing Relay is an essential component for HVAC (Heating, Ventilation, and Air Conditioning) systems that require precise temperature control. This superior-quality relay is designed to sense the temperature of the system and activate or de-activate various components based on that reading, ensuring optimal performance and energy efficiency.
Measuring approximately 3.0 inches long, 1.5 inches wide, and 1.3 inches high, this compact relay can be easily integrated into any HVAC system. It operates on a standard 120-volt power supply, making it a versatile solution for various residential and commercial applications.
The 51 model features an advanced sensing technology with a fast response time that accurately reads the temperature of the system in real-time. This technology ensures that the HVAC system maintains the desired temperature setting, providing a comfortable living environment while minimizing energy waste.
This high-performance sensing relay is designed with robust construction to ensure long-lasting functionality. It is built with corrosion-resistant materials, featuring an epoxy-coated coil and a polycarbonate housing, making it tailor-made for high-humidity environments. Additionally, the contacts are rated for over 10 million cycles, ensuring reliability and durability.
To install the Aprilaire 686720000515 51 120 Volt Sensing Relay, simply connect it to the necessary wires in your HVAC system, as outlined in the included instructions. This user-friendly design makes it a breeze for DIY enthusiasts or professional technicians to install and set up.
The Aprilaire 686720000515 51 120 Volt Sensing Relay is not only a technological marvel but also an essential investment in the longevity and efficiency of your HVAC system. With its precise temperature sensing, fast response time, reliable construction, and easy installation, this product is an indispensable tool for maintaining a comfortable environment while conserving energy in your home or business.
Pros and Cons of Buying Apraire 686720000515 51 120 Volt Sensing Relay
The Apraire 686720000515 51 120 Volt Sensing Relay is a common choice for HVAC systems that require efficient and automatic power management. Before making a purchase, understanding its pros and cons can help in making an informed decision.
Pros:1. Energy Efficiency: The 120 volt sensing relay automatically turns on and off the compressor based on the temperature sensed by the thermostat, ensuring energy savings.
2. Reliability: Apraire is a reputable brand known for their reliable and durable HVAC components, making this relay a reliable choice.
3. Easy Installation: This relay is designed to be easily installed in most HVAC systems, requiring minimal wiring and expertise.
4. Accurate Temperature Control: The temperature sensing feature enables precise temperature control for optimal system performance.
5. Large Current Capacity: With a current capacity of 15 amps, this relay can accommodate a wide range of system sizes and requirements.
Cons:1. Limited Compatibility: This relay may not be compatible with all HVAC systems, make sure to double check system specifications before purchasing.
2. Price: The Apraire 686720000515 51 120 Volt Sensing Relay might be pricier than some alternatives, which could be a concern for some budget-conscious buyers.
3. Complex Wiring: Although generally easy to install, users may need some wiring knowledge to connect it correctly into their HVAC system.
4. No Built-in Equalizer: Some users may prefer a built-in equalizer to achieve voltage stabilization and ensure system stability.
Conclusion:The Apraire 686720000515 51 120 Volt Sensing Relay offers several advantages such as energy efficiency, reliability, easy installation, accurate temperature control, and large current capacity. However, it comes with certain disadvantages such as limited compatibility, pricier cost, complex wiring, and lack of built-in equalizer. Considering the overall performance and benefits, this sensing relay can be a recommended option for those seeking efficient and accurate HVAC temperature control.
Recommendation:If the Apraire 686720000515 51 120 Volt Sensing Relay fits your budget, system requirements, and compatibility, it can be an excellent choice for enhancing your HVAC system's performance by providing efficient temperature control and energy savings.
Details:
Does not have the instruction paper with it. Pictures are being used as. Please look at all pictures and zoom in to see details.
specifications centrafurn:
- brand: Aprilaire
- type: Central Furnace
- voltage: 120 V
- upc: 686720000515
returns centrafurn:
- policy: no returns
seller centrafurn:
- city: camden-wyoming,
- rating: 100.0%
- # reviews: 223
shipping centrafurn:
- class: standard
- transit: 4-9 days
- service: usps ground advantage
- carrier: usps
- type: calculated
offer centrafurn:
- options: ship-to-home
- in stock #: 5
- sold #: 28
- prices: $19.95–$83.59
- item condition:
- New
- Used
- New – Open box
- started: december 31, 2024
- availability: in stock
payments centrafurn:
- other
- credit card: discover
- wallet: paypal
general centrafurn:
- category: Home & Garden > Heating, Air > Cooling Systems > Central Furnaces









