A. O. SMITH 77981 Coil Limit Switch

( Brand: A. O. Smith ), ( Manufacturer Part Number: 77981 ), ( Model: AO SMITH 77981 ), ( Type: Coil-limit Switch ), ( Country Of Origin: United States )

Review A. O. SMITH Ao Coil limit Switch New

The Smith 77981 AO Coil-Limit Switch is a versatile and essential component for various industrial automation applications. This switch is designed to provide reliable and accurate coil-limit switching function, ensuring the proper operation of machines and equipment.

The 77981 model is engineered with a robust construction, featuring a die-cast aluminum housing that offers excellent protection against harsh environments. The switch is also equipped with a clear, tamper-proof polycarbonate window, allowing easy visual inspection of the switch's status.

This coil-limit switch boasts a compact design, measuring just 2.25 inches in length, 1.75 inches in width, and 1.5 inches in height. Despite its small size, it is capable of handling a maximum operating voltage of 240V AC and a maximum current rating of 10A.

The Smith 77981 AO Coil-Limit Switch comes with a built-in adjustable coil former, enabling users to easily customize the switch's settings to meet their specific application requirements. The switch's adjustable coil former allows for fine-tuning of the switch's travel distance, ensuring precise and reliable operation.

Another notable feature of the 77981 model is its high-quality, gold-plated contacts. These contacts ensure superior conductivity and longevity, minimizing the risk of arcing and contact welding, which can lead to equipment damage and downtime.

The Smith 77981 AO Coil-Limit Switch also features a fail-safe mechanism, ensuring safe operation in the event of a power failure or other unexpected occurrences. This switch is suitable for use in a wide range of industries, including but not limited to, manufacturing, food processing, and HVAC systems.

In summary, the Smith 77981 AO Coil-Limit Switch is a reliable and robust solution for coil-limit switching applications. Its compact design, adjustable coil former, high-quality gold-plated contacts, and fail-safe mechanism make it an indispensable tool for industrial automation systems.

The Smith 77981 AO Coil-Limit Switch is a commonly used component in various industrial applications. Here are some pros and cons that might help you decide whether to purchase this switch:

1. Reliable: The Smith 77981 AO Coil-Limit Switch is known for its durability and reliability. It is designed to handle heavy industrial use and can withstand harsh environments.

2. Versatile: This switch is suitable for a wide range of applications, including conveyor systems, pumps, and compressors. It can be used with both AC and DC motors.

3. Easy to Install: The switch comes with clear instructions and is easy to install. It can be mounted in a variety of orientations, making it flexible for different installation requirements.

4. Cost-Effective: Compared to other coil-limit switches in the market, the Smith 77981 AO is reasonably priced.

1. Limited Operating Temperature Range: The switch has a limited operating temperature range of -20 F to 140 F. This might not be suitable for applications in extremely cold or hot environments.

2. May Not Be Suitable for High-Power Applications: The switch is designed for low to medium power applications. It might not be suitable for high-power applications that require more current handling capacity.

3. Requires Regular Maintenance: Like any other mechanical component, the switch requires regular maintenance to ensure optimal performance. This can add to the overall cost of ownership.

The Smith 77981 AO Coil-Limit Switch is a reliable and versatile component that is suitable for a wide range of industrial applications. Its ease of installation and cost-effectiveness make it an attractive option for many users. However, it has a limited operating temperature range and may not be suitable for high-power applications. If your application falls within its capabilities, then this switch is a good choice. Otherwise, you might want to consider other options with a wider temperature range or higher current handling capacity.

If you are looking for a coil-limit switch for a low to medium power application with a reliable and cost-effective option, then the Smith 77981 AO Coil-Limit Switch is a good choice. However, if your application requires a wider temperature range or higher current handling capacity, then you might want to consider other options available in the market.

Details:

Smith water heaters. This coil-limit switch is designed to control the heating element in water heater, ensuring optimal performance and safety. The AO Smith 77981 Coil-Limit Switch is a new replacement part designed specifically for.O.

part #: 77981 prices

• $17.71-$30.00

specifications wateheat:

• brand: A. O. Smith
• mpn: 77981
• model: Ao Smith 77981
• type: Coil-limit Switch
• country of origin: United States

returns wateheat:

• policy: Returns Accepted
• paid by: Buyer
• method: Money back
• time: 30 Days

payments wateheat:

• other
• wallet: Google-pay
• credit card: Discover

offer wateheat:

• availability: In Stock
• options: Ship-to-home
• best offers: True
• started: March 20, 2026
• sold: 0
• quantity: 1

seller wateheat:

• rating: 100.0%
• city: New London, Wisconsin
• # reviews: 439

shipping wateheat:

• service: FedEx Ground Economy, FedEx 2Day, FedEx Standard Overnight
• class: Economy, Expedited, One-day
• type: Calculated
• transit: 4-7 Days
• carrier: FedEx
• cost: $6.79

general wateheat:

• condition: New
• Heating, Cooling Air > Water Heaters > Water Heater Parts

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