Choosing a linear actuator looks simple until you open a spec sheet and meet a wall of numbers: force ratings, stroke length, duty cycle, feedback type, IP ratings, voltage, and connector standards. Pick the wrong combination and your motion system either stalls under load, overshoots its target, or burns out months early. This guide walks through the decisions in the order that actually matters, using the real product range from Progressive Automations, a worldwide supplier of linear motion products, as a reference for what each tier looks like in practice.
Step 1: Start With Force, Not Price
The first number to lock down is how much your application needs to push or pull, measured in pounds of force. Underestimate it and the actuator strains or stalls. The Progressive Automations range shows just how wide this scale runs. At the compact end, the PA-MC3 Ultra Compact Micro Linear Actuator handles configurations up to 27 lbs, which is plenty for small animatronics, model mechanisms, or light automation. At the heavy end, the PA-HD3 Heavy Duty Linear Actuator with Feedback pushes and pulls up to 2698 lbs and holds up to 3372 lbs, territory meant for industrial lifts and serious machinery.
A useful rule: pick an actuator rated comfortably above your peak load, not right at it. Headroom keeps the motor cool and the gears healthy over thousands of cycles.
Step 2: Match the Size and Stroke to Your Space
Force is only half the picture. The actuator also has to physically fit, and its stroke, the distance the rod travels, has to match how far your part needs to move. This is where a tiered range pays off. The PA-MC3 micro actuator is built specifically for projects where space is limited but smooth motion is still essential, fitting into tight installations thanks to its compact reinforced-plastic body. The PA-01-POT Mini Linear Actuator steps up slightly with a stainless steel stroke rod and aluminum alloy housing while staying compact. Measure your available envelope in all three dimensions before you shop, because a powerful actuator that does not fit is useless.
Step 3: Decide Whether You Need Feedback
Feedback tells your control system where the actuator rod actually is. If your project just needs full-extend and full-retract, you can skip it. If you need to stop at precise intermediate positions, or synchronize several actuators, feedback becomes essential. Progressive Automations offers both philosophies. The PA-01-POT adds integrated potentiometer feedback for position-aware motion, a simple and reliable approach. The heavy-duty PA-HD3 uses Hall effect signals instead, which deliver higher precision for demanding industrial positioning. Knowing which one your application calls for prevents both over-spending and under-building.
Step 4: Pick a Voltage and the Control Box to Match
Most actuators in this class run on 12VDC or 24VDC, and several Progressive Automations units, including the PA-01-POT, ship in both options so you can align with your existing system. Once voltage is set, the control box is what turns raw power into usable motion. The PA-CB41 control box synchronizes two Hall effect actuators and supports both 12VDC and 24VDC with plug-and-play compatibility and a wireless remote. Need more channels? The PA-CB40 synchronizes four actuators at once. Both use a self-learning pairing procedure, so you are not hand-coding controllers. If you only need basic extend and retract, a simpler controller will do, but if multiple actuators must move in unison, a sync control box is the part that makes it possible.
Step 5: Do Not Forget the Power Supply and IP Rating
The final piece beginners overlook is power. Your power supply has to deliver enough current for the actuator and control box under load. Progressive Automations power supplies span a wide 100 to 240 VAC input and output 12VDC or 24VDC across current ratings from roughly 12.5A up to a high-current 50A unit for driving multiple actuators. They all carry an IP67 waterproof rating and built-in short-circuit, overtemperature, overload, and overvoltage protection.
That IP rating deserves its own thought. If your project lives outdoors, around water, or in dust, you want IP-rated hardware throughout. The PA-01-POT is IP65, the PA-HD3 and the power supplies are IP67. An indoor desk mechanism can relax this requirement; a solar tracker or pool-side mechanism absolutely cannot.
Step 6: Plan the Brackets and Wiring Last
Once the core trio of actuator, control box, and power supply is chosen, finish the build with mounting and wiring. A dedicated mounting bracket set, like the salt-spray-treated steel set designed for the PA-ST5, gives you secure attachment with up to 180 degrees of rotation. Connector mismatches are the most common last-minute snag, which is why the catalog stocks wire adapters and extenders to interface in-house control boxes with external systems or to reach a power supply mounted across the room. Sorting this out before you order saves a frustrating second shipment.
Quick Recap Before You Buy
- Force: Choose a rating above your peak load, from 27 lbs micro units up to 2698 lbs heavy-duty.
- Size and stroke: Measure your space and required travel first.
- Feedback: Potentiometer for simple positioning, Hall effect for precision and sync.
- Voltage and control: Match 12VDC or 24VDC, then add a sync control box if you run multiple actuators.
- Power and IP: Size the current correctly and go IP67 for anything outdoors.
- Brackets and wiring: Confirm mounting and connectors before checkout.
Work through those six steps and you will land on the right actuator the first time instead of returning the wrong one. When you are ready to spec your build, the full range, from micro actuators to heavy-duty units, control boxes, and IP67 power supplies, is in one place.
Browse the Progressive Automations range and build your motion system.