Compact automation projects often leave little room for motors, linkages, wiring, and mounting hardware. In these applications, every fraction of an inch matters—but reducing actuator size should not mean giving up dependable motion, practical force, or integration flexibility. Proudly made in Canada, our new PA-MC3 Ultra Compact 12V Micro Linear Actuator is designed for small-scale automation systems where installation space, weight, and power consumption are critical considerations. In this product overview, we will explore the PA-MC3’s key features, available configurations, control options, and potential applications.
Key Features and Benefits of the PA-MC3
Ultra-Compact Dimensions for Space-Limited Designs
The PA-MC3 micro linear actuator is built for applications where most actuators may be too large to install. The smallest standard configuration offers a 0.4-inch stroke with a retracted hole-to-hole length of only 1.75".
Three standard stroke options are available:
| Stroke Length | Retracted H2H | Extended H2H | Weight |
|---|---|---|---|
| 0.4" | 1.75" | 2.15" | 0.06 lbs |
| 2" | 3.35" | 5.35" | 0.08 lbs |
| 4" | 5.35" | 9.35" | 0.10 lbs |
This compact geometry makes the PA-MC3 a practical motion solution for miniature mechanisms, lightweight assemblies, concealed installations, and prototypes with strict dimensional limits.
Multiple Force and Speed Configurations
As a 12V micro linear actuator, the PA-MC3 is available in three force configurations, allowing designers to select the balance of speed and load capacity that best suits their application.
| Specification | Fast Speed | Medium Speed | High Force |
|---|---|---|---|
| Input voltage | 12 VDC | 12 VDC | 12 VDC |
| Dynamic force | 6 lbs | 18 lbs | 27 lbs |
| Static force | 14 lbs | 19 lbs | 27 lbs |
| No-load speed | 1.18"/sec | 0.36"/sec | 0.24"/sec |
| Full-load speed | 0.70"/sec | 0.26"/sec | 0.17"/sec |
| No-load current | ≤80 mA | ≤80 mA | ≤80 mA |
| Full-load current | ≤200 mA | ≤200 mA | ≤200 mA |
The 6 lbs configuration offers the fastest travel speed, reaching up to 1.18"/sec without a load. For applications requiring greater lifting or pushing capacity, the 27 lbs model provides the highest dynamic force rating within the PA-MC3 range.
Low Current Draw for Compact Electrical Systems
Power availability can be limited in portable devices, embedded systems, battery-powered projects, and small electronic assemblies. The PA-MC3 ultra-compact micro linear actuator draws no more than 80 mA without a load and no more than 200 mA at full load, depending on operating conditions.
This low current requirement can simplify integration into systems with compact power supplies, smaller wiring, or limited available electrical capacity. It can also make the actuator easier to incorporate into projects where minimizing total system power consumption is a priority.
Simple Two-Wire Operation
The standard PA-MC3 uses an ACME screw driven by a brushed DC motor with straightforward two-wire operation. Applying 12 VDC moves the actuator in one direction, while reversing the polarity changes the direction of travel.
Standard models include a 2-pin SL connector and a 12-inch, 22 AWG cable that is a direct plug-and-play with our wireless PA-CB2 control box. When paired with suitable wiring harnesses, this simple operating method allows the actuator to be integrated with switches, relays, motor controllers, microcontrollers, and control boxes.
PWM Compatibility for Smoother Motion
The PA-MC3 ultra-compact micro linear actuator is compatible with Pulse Width Modulation (PWM). When paired with a suitable PWM-compatible control system, PWM can be used to manage the power delivered to the actuator’s brushed DC motor.
This makes it possible for a compatible controller to provide functions such as:
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Soft starting
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Soft stopping
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Adjustable motor speed
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More gradual acceleration and deceleration
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Smoother movement near the end of travel
These capabilities can be especially beneficial in applications where sudden movement could affect positioning, create unwanted vibration, disturb lightweight components, or reduce the quality of the user experience.
Built-In Limit Switches
Internal limit switches automatically stop the motor when the actuator reaches its fully extended or fully retracted position. This helps prevent the actuator from continuously driving beyond its intended mechanical travel.
Built-in limit switches simplify system design because separate external end-of-travel switches may not be necessary for basic extension and retraction control.
Lightweight Reinforced Plastic Construction
The PA-MC3 housing and stroke rod are manufactured from reinforced plastic, helping the actuator maintain a low overall weight while supporting compact mechanical designs.
Depending on stroke length, the actuator weighs between approximately 0.06 and 0.10 lbs. This makes it well suited to projects where additional actuator weight could affect balance, mobility, energy use, or the movement of the surrounding mechanism.
Future Potentiometer Feedback Option
The standard PA-MC3 is currently offered without positional feedback. A potentiometer feedback version is being developed for future release. The upcoming model would use a 5-pin SL connector, allowing an external control system to monitor the actuator’s approximate position through a variable-resistance signal.
Potentiometer feedback can be useful in systems that require:
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Position monitoring
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Repeatable intermediate stopping points
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Closed-loop control
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Automated movement sequences
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Integration with microcontrollers or programmable systems
Mounting the PA-MC3
The actuator includes front and rear mounting holes that are compatible with the BRK-MC3 mounting bracket set (coming soon). A suitable installation should allow the actuator to pivot naturally as the mechanism moves. The load should remain aligned with the actuator’s extension axis to reduce side loading, binding, and unnecessary stress on the housing and stroke rod.
Ideal Applications for the PA-MC3
The PA-MC3 is designed for smaller automation systems that require short-stroke movement, low power consumption, and minimal installation space.
Animatronics and Models
The actuator can provide controlled movement for props, scale models, displays, costumes, and animatronic components. PWM-compatible control can also help produce smoother, less abrupt motion.
Home Automation
Potential home automation uses include small vents, latches, concealed compartments, lightweight panels, miniature blinds, and custom furniture mechanisms.
Consumer Product Prototypes
Product designers can use the PA-MC3 to evaluate powered movement in compact appliances, electronic devices, storage systems, and other consumer product concepts.
Food and Beverage Equipment
The actuator may be incorporated into suitably protected mechanisms for small dispensers, control surfaces, access panels, and automated equipment.
General Automation
The PA-MC3 can also support small gates, guides, selectors, locks, switches, camera mechanisms, sensor positioning systems, and other light-duty automation tasks.
Frequently Asked Questions
What makes the PA-MC3 different from other micro linear actuators?
The PA-MC3 is designed around an exceptionally compact and lightweight platform. Its smallest model has a 1.75-inch retracted hole-to-hole length while still providing 0.4 inches of linear travel.
What voltage does the PA-MC3 require?
The PA-MC3 operates at 12 VDC.
What stroke lengths are available?
Standard stroke options include 0.4, 2, and 4 inches.
How much force can the PA-MC3 provide?
The actuator is available with dynamic force ratings of 6, 18, or 27 lbs. Static force ratings range from 14, 19, or 27 lbs, depending on the selected model.
Does the PA-MC3 have positional feedback?
The standard model does not include feedback. A potentiometer feedback version is in development and coming soon.
Is the PA-MC3 PWM compatible?
Yes. The PA-MC3 can be operated with a suitable PWM-compatible controller to support functions such as speed adjustment and soft start or stop behavior.
Does the actuator stop automatically at the end of its stroke?
Yes. Built-in limit switches stop the motor at the fully extended and fully retracted positions.
Does the PA-MC3 include overload protection?
No. The mechanism must be designed to prevent excessive force, obstructions, binding, and mechanical overload.
What is the duty cycle?
The PA-MC3 has a 20% duty cycle: up to 5 minutes of operation followed by approximately 20 minutes of rest.
In Summary
The PA-MC3 Ultra Compact Micro Linear Actuator provides practical linear motion for applications where space, weight, and power are limited. Its stroke options from 0.4 to 4 inches, force ratings up to 27 lbs, low current draw, built-in limit switches, and PWM compatibility make it a versatile choice for miniature robotics, product prototypes, home automation, animatronics, and other light-duty mechanisms.
We hope you found this as informative as we did, especially if you were interested in learning more about our offerings for compact linear actuators in general. If you have any queries or wish to discuss our products further, please do not hesitate to reach out to us! We are experts in what we do and will be happy to assist in any way we can.
sales@progressiveautomations.com | 1-800-676-6123