
MK-3121 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $75.56 | Condition is Used, BARBER-COLMAN MK-3121-0-2 PNEUMATIC ACTUATOR, FREE SHIPPING | 100.0% |
![]() | $89.99 | Top Pick! Condition is Used, BARBER-COLMAN MK-3121-0-2 PNEUMATIC ACTUATOR, shipping cost = $23.90 | ![]() |
![]() | $175.00 | Top Pick! Condition is Used, Barber Colman Pneumatic Damper Actuator MK-3121, shipping cost = $9.70 | 99.7% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $226.68 | Condition is New, BARBER COLMAN (SCHNEIDER) MK-3121 Pneumatic Valve Actuator, shipping cost = $26.01 | 100.0% |

The Barber-Colman MK-3121, also known as the Invensys MK3121, is a versatile and powerful servo actuator designed for a wide range of industrial applications. This actuator is manufactured by Invensys, a leading global technology company, under the Barber-Colman brand, known for its high-performance motion control solutions.
The MK-3121 is a compact, rugged actuator that measures 3.7 inches in width, 4.7 inches in height, and 9.3 inches in length. It weighs approximately 13.2 pounds, making it a suitable choice for installations where space is limited. Its compact size, however, does not compromise its performance. The actuator is capable of delivering a continuous torque of up to 17 foot-pounds and a maximum torque of 34 foot-pounds.
The MK-3121 is designed with a robust construction to withstand harsh environments. The actuator's housing is made of aluminum with a hard anodized finish, providing excellent corrosion resistance. The actuator's shaft is made of stainless steel, ensuring longevity and reliability, even in high-temperature applications. The actuator is also sealed to IP65, making it resistant to water and dust, making it suitable for use in demanding environments.
The MK-3121 is a servo actuator, which means it is capable of precise positioning and control. It utilizes a brushless DC motor with a Hall effect sensor for feedback, ensuring high accuracy and repeatability. The actuator can be controlled using various communication protocols, including CANopen, Modbus, and EtherNet/IP, making it easy to integrate into various automation systems.
The MK-3121 is also equipped with several advanced features, including overload protection, thermal protection, and position feedback. It also offers a wide range of mounting options, including flange, foot, and wall mounting, making it adaptable to various installation configurations.
In conclusion, the Barber-Colman MK-3121, or Invensys MK3121, is a high-performance, versatile, and robust servo actuator designed for industrial applications. Its compact size, powerful torque, and precise positioning capabilities make it an ideal choice for various automation systems. Its rugged construction and advanced features ensure reliability, longevity, and easy integration into various industrial control systems.
The Barber-Colman MK-3121 and its equivalent Invensys MK3121 are high-frequency generators used in various industrial applications, including power electronics, radio frequency (RF) welding, and induction heating. Here are some pros and cons of buying this generator:
Pros:1. Versatility: The MK-3121 can be used in different applications due to its adjustable output frequency, power, and voltage.
2. Durable construction: The generator's robust design and high-quality components ensure long-lasting performance.
3. Efficient: This generator is known for its high efficiency, which can save energy costs in the long run.
4. Reliable: The MK-3121 has a reputation for being a reliable machine, making it a good investment for businesses that require consistent performance.
Cons:1. Expensive: The price of the MK-3121 is relatively high compared to other generators in its class.
2. Complexity: The generator's advanced features can be challenging to operate for inexperienced users.
3. Maintenance: Like any other industrial equipment, the MK-3121 requires regular maintenance to ensure optimal performance.
4. Size and weight: The generator is large and heavy, making it difficult to transport and install.
In conclusion, the Barber-Colman MK-3121/Invensys MK3121 is a high-performance, versatile, and reliable generator suitable for various industrial applications. However, its high cost, complexity, maintenance requirements, and size make it a significant investment.
If you are considering purchasing this generator, it is essential to weigh the pros and cons carefully and ensure that it meets your specific application requirements and budget. You may also want to consider alternative generators with similar capabilities but lower costs or simpler designs. Ultimately, the decision to buy the MK-3121 depends on your business needs, budget, and technical expertise.
Details:
Call to use a shipping service other than the ones listed. Packaging and handling: items are safely eds packaged in custom shipping cartons for protection. Sells new and surplus product develops channels to purchase such. All products are guaranteed to be working but may show signs of use if purchasing a used product.
specifications maxohvac:
- brand: Barber Colman
- mpn: Mk-3121
seller maxohvac:
- # reviews: 196665
- city: 1 millennium dr, willingboro, nj 08046
- rating: 99.6%
shipping maxohvac:
- service: standard
- class: standard
- transit: 29-34 days
- type: fixed
general maxohvac:
- category: Business & Industrial > Hvac Refrigeration
returns maxohvac:
- policy: returns accepted
- method: money back
- time: 30 days
- paid by: buyer
offer maxohvac:
- sold #: 8
- availability: in stock
- options: ship-to-home
- prices: $75.56–$226.68
- item condition:
- Used
- New
- in stock #: 4
- started: march 27, 2026
payments maxohvac:
- other
- wallet: google-pay
- credit card: visa
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