Linear Actuator EPS-04, 225lbs Lift

$ 84.95

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Need a helping hand? Our linear actuators come in a wide range of sizes to help with heavy lifting! Whether you're moving heavy doors or just simply working on a school robotics project, our linear actuators are a perfect fit for your automation needs!

Size Chart

Stroke Length Retracted Length (Hole-to-Hole) Extended Length (Hole-to-Hole)
1" 8" 9"
2" 9" 11"
4" 11" 15"
6" 13" 19"
8" 15" 23"
10" 16.75" 26.75"
12" 18.75" 30.75"
14" 20.75" 34.75"
16" 23.00" 39.00"
18" 24.75" 42.75"
20" 26.50" 46.50"
22" 28.50" 50.50"
24" 30.50" 54.50"
26" 32.50" 58.50"
28" 34.50" 62.50"
30" 36.50" 66.50"

Technical Information

Input Voltage 12v DC
Stroke (Movement) 1" - 30"
Force 225lbs (1000N)
Speed (mm/sec) 40mm/sec
IP Rating (Protection Class) - IP54 *Ingress of dust is not entirely prevented, but it must not enter in sufficient quantity to interfere with the satisfactory operation of the equipment. Water splashing against the enclosure from any direction shall have no harmful effect
Operational Temperature -13F ~ +149F
Noise <45db
Limit Switch Inner
Current 6.5 Amps
Cycle 20%

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Back Driving Underload

When a linear actuator underload and no longer being powered, you may find that the linear actuator may retract by itself (i.e. back drive). This is particularly the case for actuators using motors that are side mounted (perpendicular) to the shaft. 

What Causes Back Driving?

While the actuator is under a large amount of weight, the internal DC motor can act as a generator producing a small amount of voltage. When this happens, the actuator can begin to retract. To limit this back driven voltage from occurring, continue reading to learn how to minimize this from happening.

CEMF Brake Using a SPDT Relay

The easiest, non-evasive and cheapest way to prevent back driving from happening is to use a Single Pole Double Throw Relay (SPDT) with a wiring harness.

Why use a relay? To prevent the motor from retracting, the relay is used to short the terminals in the motor and create a closed loop inside of the DC motors magnetic wire coils. When this happens, the counter-electromotive force (CEMF/Back EMF) in the closed loop of acts as a torque brake and keeps the actuator from moving when under large loads.


Automation. Done. Right. Automation. Done. Right.

Automation. Done. Right.

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