High Performance 24VDC Electric Rotary Actuator EH Series
The only 24VDC electric rotary actuator purpose-built for extreme heat, deep cold, continuous vibration, and high-pressure washdown — and the only one where the answer to "which model?" is just a torque number.
The AMOT EH Series is a 24VDC electric rotary actuator purpose-built for engine-mounted systems, defense platforms, mining equipment, hydraulic fracturing, locomotives, and naval vessels . Engineered from the ground up at −40°C, 40G shock, and 14.1 GRMS vibration, not adapted from a factory-floor design. It delivers 100% duty cycle at maximum rated load, full CANbus J1939 integration, and over 1,000,000 tested cycles. If your torque requirement is met by 125 Nm or 25 Nm, the EH Series is the only sizing question you need to answer.
Performance Specifications:
- 24VDC electric quarter-turn actuator (5A max current)
- Operating range: -40°C to +125°C — designed at these temperatures, not rated for them after the fact
- 40G mechanical shock (MIL-STD-810G, Method 516.6)
- 14.1 GRMS vibration resistance (10–1000 Hz, 20 hours per axis)
- 1,000,000+ tested cycles at rated load — a test result, not a projection
- 100% duty cycle: at max load and max temperature, simultaneously
- IP67 and IP69K sealed — rated for submersion and high-pressure washdown
- Housing: steel, aluminum alloy, and polycarbonate with anodized aluminum external coating
- 90° stroke as fast as 4 seconds — speed programmable, configurable independently for open and close
- Control: analog (4–20mA, 0–10V), PWM, or CANbus J1939 — software configurable, no hardware changes
- Manual override fitted as standard
- CE and UKCA certified
- EH125: 125 Nm — for higher valve breakaway loads
- EHC25: 25 Nm — same specs, smaller package for space-constrained applications
Why We Built the EH Series
AMOT has manufactured valve systems for the harshest industrial environments since 1948. For years, we went to source actuators for our own products and couldn't find anything that could keep up. Pneumatic systems demanded compressors, filters, dryers, and accumulator tanks. Hydraulic systems leaked under vibration. Standard electric actuators were designed for climate-controlled factories and adapted from there.
So we built one from scratch. The EH Series wasn't rated for extreme environments after the fact. The design started there. Nearly 80 years in harsh-environment valve control taught us exactly what fails and why. We engineered every component of the EH to eliminate those failure modes.
| Power Supply | 24 VDC, 5A max current |
| Torque Output | EH125: 125 Nm / EHC25: 25 Nm |
| Rotation | 90° quarter-turn |
| Stroke Time | As fast as 4 seconds (speed programmable, open/close independently configurable) |
| Operating Temperature | −40°C to +125°C (−40°F to +257°F) |
| Duty Cycle | 100% at maximum rated load and maximum temperature |
| Vibration Resistance | Random: 14.1 GRMS, 10–1000 Hz, 20 hours per axis |
| Mechanical Shock | MIL-STD-810G, Method 516.6, 40G |
| Endurance | Tested to 1,000,000+ cycles at rated load |
| Ingress Protection | IP67 (submersion to 1m) and IP69K (high-pressure, high-temperature washdown) |
| Control Signals | 4–20 mA, 0–10 V, PWM, SAE J1939 CAN — software configurable, no hardware changes |
| Feedback | Non-contact Hall effect sensor — 4–20 mA, 0–10 V, or J1939 CAN output |
| Fail-Safe Options | Fail-in-place, fail to 0° (CCW), fail to 90° (CW) — configurable independently |
| Manual Override | Fitted as standard |
| Materials | Steel, aluminum alloy, polycarbonate — anodized aluminum external coating |
| Mounting | ISO 5211 F07, high-vibration pattern — mounts in any orientation |
| Weight | EH125: 11.0 kg / EHC25: 4.0 kg |
| Certifications | CE, UKCA / DNV marine class (pending) / Class 1 Div 2 (pending) |
Typical Applications for Electric Rotary Actuators
EH Series electric quarter-turn actuators are ideal for automating industrial quarter-turn valves – including ball, butterfly, and shutoff valves – in harsh environments. Common applications include:
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Engine-mounted controls on large diesel and gas engines
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Military and naval vessels
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Locomotives and rail powerpacks
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Mining and off-highway equipment
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Industrial quarter-turn valves in oil & gas and power generation systems
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Electric Drive System
The EH Series uses a brushless DC (BLDC) motor driving a precision gearbox to produce quarter-turn (90°) rotary motion. The motor and gearbox assembly is designed as a matched system — not a generic motor paired with aftermarket gear reduction — resulting in a fast acting electric actuator capable of completing a full 90° stroke in as little as 4 seconds.
Stroke speed is programmable, making the EH Series a true adjustable speed electric actuator. Speed can be configured independently for opening and closing strokes to match the dynamic requirements of the controlled process. This eliminates the need for external speed controllers or throttling devices.
Control & Communication
The actuator supports multiple control signal types — all software configurable without hardware changes:
- Analog: 4–20 mA or 0–10 V command and feedback signals
- PWM: Pulse width modulation for direct digital control
- CANbus J1939: Full SAE J1939 CAN communication for integration with engine control units, vehicle management systems, and industrial control networks
Position feedback is provided by a non-contact Hall effect sensor, eliminating the wear and drift issues associated with potentiometer-based feedback in high-vibration environments. The J1939 CAN interface supports 200+ configurable parameters, allowing the actuator to be fully tuned to application requirements without mechanical modification.
Fail-Safe Configuration
The EH Series provides independent fail-safe configuration for loss of signal conditions. Three modes are available per condition: fail-in-place (hold last position), fail to 0° (CCW limit), or fail to 90° (CW limit). This gives system designers the flexibility to define safe-state behavior appropriate to their specific application — a critical requirement for mission-critical systems.
Manual Override
A manual override mechanism is fitted as standard on all EH Series actuators, enabling valve operation without power. This is particularly important for commissioning, maintenance, and emergency scenarios in remote or mobile installations where electrical power may not always be available.
The problem with what youʼre running today.
In high-vibration, extreme-temperature environments, every actuation technology carries tradeoffs your team is managing around.
Pneumatic Systems
Compressors. Filters. Dryers. Accumulator tanks. Control modules. You're not just running an actuator, you're maintaining an air infrastructure. And it still fails under vibration and moisture.
Hydraulic Systems
Leak risk. Seal maintenance. Degradation under vibration and temperature cycling. In mobile and remote environments, a hydraulic leak isn't a nuisance — it's a shutdown.
Standard Electric Actuators
Designed for climate-controlled factory floors. Adapted from there. Ask how many cycles they'll guarantee at rated load in your operating conditions and whether they'll put it in writing.
Where the EH Series is deployed.
Click any application to see the challenges, how the EH Series addresses them, and which model typically fits.
Engine OEM (Thermal Management)
EGR control, intake throttling, exhaust bypass, and motorized thermostats for diesel, gas, and alternative fuel engines.
Defense & Military Vehicles
MIL-STD-810G rated valve actuation for armored vehicles, trucks, and mobile defense platforms.
Hydraulic Fracturing
Butterfly valve automation on the frac pad — eliminates pneumatic infrastructure entirely.
Mining Equipment
Air drills, VFD cooling, and engine-mounted actuation in extreme dust, vibration, and temperature.
Rail & Locomotive
Engine cooling, emissions control, and auxiliary systems in sustained-vibration rail environments.
Marine & Naval Platforms
Isolation and control valves on vessels where shock resistance and submersion survival are baseline.
One platform. One question.
The EH Series is a single actuator family calibrated to torque requirement. Operating range, shock resistance, sealing, duty cycle, and control interfaces are identical across the line.
One question determines which unit fits:
| MODEL | TORQUE | BEST FOR |
|---|---|---|
| EH125 | 125Nm | Higher valve breakaway torque, larger valves |
| EHC25 | 25Nm | Space-constrained, densely packaged systems |
All other specs shared across the family → Full datasheet
Recognize your application?
Watch the EH Series under real test conditions — shaker table, submersion, extreme temperature cycling.
- Built for:
- Vibration
- |Submersion
- |Extreme cold starts
- |1,000,000+ cycles
Frequently Asked Questions
Common questions about electric rotary actuators for harsh and demanding environments.
Electric rotary actuators eliminate compressed air infrastructure entirely, running on 24VDC with software-configurable control. The historical tradeoff has been durability: most electric actuators weren’t engineered for the shock, vibration, and temperature extremes that pneumatic systems tolerate. The EH Series closes that gap by delivering the simplicity of electric actuation with environmental ratings that exceed most pneumatic alternatives.
Pneumatic actuation requires compressors, filters, dryers, accumulator tanks, and control modules — all of which add cost, maintenance burden, and failure points in high-vibration and extreme-temperature environments. For engineers evaluating the switch, the question is not which technology is more durable in ideal conditions, but which one survives your actual operating environment with the least infrastructure overhead.
Most cannot — they were designed for factory-floor environments. The EH Series is tested to 14.1 GRMS random vibration (10–1000 Hz, 20 hours per axis) and 40G mechanical shock per MIL-STD-810G, Method 516.6.
These are full-assembly test results, confirmed across more than 1,000,000 cycles at rated load.
IP67 certifies complete dust sealing and submersion protection to 1 meter. IP69K adds protection against high-pressure, high-temperature washdown.
Together, these ratings allow operation in saltwater, chemical splash, and pressure-washing environments where standard actuator housings would fail.
Full 90° stroke in as little as 4 seconds, with independently configurable opening and closing speeds.
This sub-6-second response supports emergency shutdown and fast isolation valve applications.
Supports Analog (4–20 mA, 0–10 V), PWM, and SAE J1939 CAN — all software configurable.
Includes non-contact Hall effect position sensing and over 200 configurable parameters.
Choose based on torque: EH125 = 125 Nm, EHC25 = 25 Nm.
All other specs are identical — same platform, different torque sizing.
Currently CE and UKCA certified. DNV marine class and Class 1 Division 2 certifications are in progress.
Standard operating range is −40°C to +125°C. For lower temperatures, consult AMOT engineering for configuration options tailored to extreme environments.
Ready to spec the EH Series for your application?
With 200+ configurable parameters, your AMOT application engineer will work through fit, sizing, and integration with your team before anything ships.
Or email us directly: sales@amot.com
