The AMOT EH Series was not adapted from an existing product. It was built from the ground up because nothing on the market survived what AMOT's own customers were dealing with - engines running at temperature extremes, equipment vibrating apart, washdown cycles destroying sealed enclosures, and control systems that needed native J1939 without a signal converter in the chain.
The result is an electric rotary actuator that qualifies for six demanding industries using the same core spec set. The -40°C cold floor that handles a locomotive on an outdoor rail yard overnight is the same rating that qualifies it for an arctic mine startup. The 14.1 GRMS vibration resistance built for on-engine mounting is the same spec that survives a haul road. The IP69K rating required for ship deck washdown is the same protection needed in a mining wash bay.
This page maps those specs to the industries where they matter. Use the jump links in the table of contents to go directly to your industry. If you are evaluating whether the EH qualifies for your environment, start with the self-qualifier below.
Is the EH Series Right for Your Application?
Use this table to check your core requirements against the EH Series spec set before going deeper. Each row is a pass/fail gate - one hard stop means the EH is not the right product for that installation.
| Your Requirement | EH Spec Match | What It Means |
|---|---|---|
| What is your voltage? | 24VDC | Pass. EH125 and EHC25 are native 24VDC. No step-down converter needed. |
| What is your temperature range? | -40°C to +100°C or tighter | Pass. EH125 rated -40°C to +100°C. EHC25 extends to +125°C. |
| What is your vibration environment? | 10+ GRMS sustained | Pass. EH Series rated to 14.1 GRMS, 10-1000 Hz, 20 hours per axis. |
| What is your control protocol? | J1939 CAN, 4-20mA, 0-10V, or PWM | Pass. All four are native. No signal converters needed. |
| What is your ingress requirement? | IP67 or IP69K | Pass. EH Series carries both. IP69K covers high-pressure washdown. |
| Do you need ATEX / IECEx certification? | Yes | Stop here. The EH Series is CE and UKCA certified with ATEX-certified options available upon request. Contact AMOT to discuss your application. |
If you passed the qualifier, the table below shows the six specs that make the EH cross-industry. These are not marketing claims - they are the tested, published ratings that define which environments this actuator can enter and which it cannot.
The Six Specs That Make It Cross-Industry
These are the tested, published ratings that define where the EH Series qualifies and where it does not. The same six specs repeat across all six industries on this page.
| Specification | Rating | Notes |
|---|---|---|
| Temperature Range | -40°C to +100°C | EH125 / -40°C to +125°C EHC25 |
| Vibration Resistance | 14.1 GRMS | 10-1000 Hz, 20 hrs/axis |
| Shock Resistance | 40G | MIL-STD-810G Method 516.6 |
| Ingress Protection | IP67 + IP69K | Submersion and high-pressure washdown |
| Communication | J1939 CAN | Also 4-20mA, 0-10V, PWM |
| Duty Cycle | 100% continuous, 1,000,000+ cycles at rated load | At max load and max temperature |
On-Engine and EGR Systems
An engine bay is the hardest environment an electric actuator can be asked to survive. Temperature swings from cold start to sustained operation can span 140 degrees. Vibration is continuous, not periodic. The actuator is bolted directly to the source of the movement it is trying to control. And modern ECUs speak J1939 - a protocol that most industrial actuators do not support natively.
The EH Series was designed specifically for this. AMOT makes the valves that sit on these engines. When off-the-shelf actuators kept failing, AMOT built one that would not.
What it replaces: Pneumatic actuation is still the default in many on-engine valve applications because historically nothing electric survived the environment. A pneumatic system requires a compressor, air dryers, filters, and control modules - all of which add failure points and maintenance overhead. One 24VDC cable and a J1939 connection replaces all of it.
| Temperature | -40°C to +100°C standard | EHC25 to +125°C |
| Vibration | 14.1 GRMS, 10-1000 Hz, 20 hrs/axis |
| Shock | MIL-STD-810G Method 516.6, 40G |
| Protocol | J1939 CAN native - direct ECU connection, no converter |
| Duty Cycle | 100% continuous at max load and temperature |
| Rotation | True 90 degrees - compatible with standard quarter-turn valves |
Typical on-engine applications: EGR valve control, coolant bypass valve, charge air cooler bypass, throttle valve, oil control valves on gas engines.
Explore Engine Control Applications
Mining and Heavy Equipment
Mining equipment operates in conditions that expose every weakness in a standard actuator. Cold starts at -40°C on early-shift haul trucks. Continuous vibration on extraction equipment. Aggressive high-pressure washdown at the end of every shift. Dust that finds every gap in a housing that was not designed to stop it.
Four specs have to align simultaneously for an electric actuator to work in mining: cold-temperature rating, sustained vibration resistance, IP69K sealing, and 100% continuous duty. Most actuators fail on at least two of them. The EH passes all four as standard.
What it replaces: Hydraulic actuation is common on heavy mining equipment because of its torque density. But hydraulic systems leak - in a mine environment, that means fluid contamination on high-heat components, maintenance calls on remote equipment, and environmental compliance risk. The EH delivers comparable torque in a self-contained 24VDC package with no fluid lines.
AMOT's mining page already identifies the EH Series by name for VFD cooling system control - precise regulation of variable frequency drive cooling to ensure reliable performance of electric motors on extraction equipment.
| Cold Start | -40°C - handles overnight temperatures at altitude and in northern climates |
| Vibration | 14.1 GRMS - rated for sustained vibration from extraction and haulage equipment |
| Washdown | IP69K - survives high-pressure, high-temperature shift-end wash cycles |
| Duty Cycle | 100% continuous - no rest cycles required on always-on cooling systems |
Typical mining applications: VFD cooling control, engine thermal management on haul trucks, coolant bypass on stationary generators at remote sites.
Marine and Naval
Marine installations put actuators in direct conflict with seawater, salt spray, deck washdowns, and the mechanical shock of vessel operations. 24VDC is the standard power supply on most commercial and naval vessels. And the environment below decks - exhaust-adjacent, thermally variable, vibration-loaded from main propulsion - is not far from an engine bay.
IP69K is the critical differentiator in marine applications. IP67 covers submersion. It does not cover the high-pressure seawater jets used to clean deck equipment. Most actuators marketed for marine use carry IP67 or IP68. The EH carries both IP67 and IP69K, making it the only actuator in its class rated for direct washdown exposure.
What it replaces: Pneumatic actuators are still common in marine engine rooms because they handle the temperature and vibration. The infrastructure cost - compressors, air dryers, lines running through the vessel, freeze protection in cold-water routes - is the problem. The EH connects directly to the vessel's 24VDC bus and the ECU's J1939 network.
| Sealing | IP67 + IP69K - only actuator in class rated for deck washdown |
| Shock | MIL-STD-810G 40G - shock events from vessel operations and docking |
| Power | 24VDC native - standard ship power bus, no converter |
| Temperature | -40°C to +100°C - covers cold-water routes and engine room heat |
| Cycles | Tested to 1,000,000+ cycles at rated load |
Typical marine applications: Seawater cooling bypass valves, fuel control on propulsion engines, scrubber system control, heat recovery valve actuation.
Locomotive and Rail
Rail is one of the most mechanically demanding environments for actuators. Locomotive engines are large, vibration-intensive, and operated in temperature extremes across geography. Coupling events - the mechanical shock when rail cars connect - can reach 40G or more. Equipment sits outside overnight in conditions that drop well below -40°C in northern operations.
MIL-STD-810G Method 516.6 is the shock standard that covers coupling events. It is not commonly cited by industrial actuator manufacturers because industrial actuators are not tested to it. The EH is tested to 40G on that standard as a baseline spec.
What it replaces: Older locomotive engine control systems rely on pneumatic actuation, often using the same compressed air infrastructure as the braking system. Reducing dependence on that shared infrastructure simplifies maintenance and removes the brake-air actuator conflict on systems where air pressure management is critical.
| Cold Start | -40°C - survives overnight soak in northern rail yards |
| Shock | MIL-STD-810G 40G - rated for coupling events and rough track |
| Vibration | 14.1 GRMS - handles sustained vibration from large-displacement locomotive engines |
| Power | 24VDC - integrates with locomotive electrical bus |
| Duty Cycle | 100% continuous - no rest cycles on engine management valves |
Typical rail applications:: EGR control on modern emissions-compliant locomotive engines, coolant bypass, charge air cooler control.
Explore Transportation Applications
Oil and Gas
Oil and gas is a broad category. Upstream, midstream, and downstream have different requirements, and the relevant question for EH Series specification is whether the installation is in a classified explosive atmosphere or not.
For installations that are not ATEX-classified - compressor packages, generator sets, engine-driven equipment, and many upstream and midstream installations - the EH Series qualifies on temperature, vibration, duty cycle, and protocol. It connects directly to the J1939 networks common on modern engine control systems and operates continuously in the temperature ranges found at remote sites.
Where the EH Qualifies in Oil and Gas
- Compressor package engine control - EGR, coolant bypass, throttle on gas-engine-driven compressors
- Generator set valve actuation - engine-mounted valves on power generation equipment at remote sites
- Engine-driven pump control - upstream artificial lift and transfer systems
- Midstream processing temperature control - on non-classified process lines
Where It Does Not Qualify
Installations in ATEX Zone 1 or Zone 2 classified areas require ATEX or IECEx certification. The EH Series carries CE and UKCA certification but is not ATEX rated. If your installation is in a classified area, the EH is not the right product regardless of its other specs. Contact AMOT to discuss certified alternatives.
| Temperature | -40°C to +100°C - cold remote sites and engine-adjacent heat |
| Protocol | MIL-STD-810G 40G - rated for coupling events and rough track |
| Power | 24VDC - standard on generator sets and compressor packages |
| Duty Cycle | 100% continuous - sustained operation on always-on equipment |
| Certification | CE, UKCA - not ATEX/IECEx (see note above) |
Explore Oil and Gas Applications
Hydrogen and Fuel Cell
Hydrogen fuel cell systems and hydrogen engine applications have specific actuation requirements that most industrial electric actuators are not built for. Precise modulation at 24VDC. Wide temperature range to handle cold-climate deployment and thermal cycling during operation. Compact form factor where space around the stack or engine is constrained. And 100% continuous duty - hydrogen systems do not have idle cycles the way intermittent-duty actuators are designed around.
The EHC25 at 25 Nm is the model most often specified in hydrogen applications. Its -40°C to +125°C temperature range handles both cold-start conditions and the elevated thermal environment around fuel cell stacks and hydrogen combustion systems. At 4 kg and with an 8-pin bulkhead connector, it is designed for integration in tight installations.
AMOT's fuel cell page specifically identifies actuators as part of its hydrogen fuel cell solution set - air control and high-pressure fuel shut off solutions for systems that demand reliable, safe, and high-performance operation.
What it replaces: Pneumatic actuation is problematic in hydrogen environments because of contamination risk. A compressed air system introduces moisture into environments where clean, dry gas control is the engineering requirement. An electric actuator with a direct 24VDC connection and native modulation removes that contamination vector entirely.
| Model | EHC25 - 25 Nm, 4 kg, 8-pin bulkhead connector |
| Temperature | -40°C to +125°C - widest range in the EH family |
| Duty Cycle | 100% continuous - no rest cycles on modulating fuel and air control |
| Power | 24VDC native - standard in hydrogen system architectures |
| Sealing | IP67 + IP69K - protection in wet and washdown environments |
Explore Hydrogen Applications Explore Fuel Cell Applications
Which Specs Matter by Industry
The table below shows which of the EH Series' core specs are the disqualifying requirements in each industry. 'Yes' means that spec is the reason the EH qualifies where other actuators do not. A dash means the spec is met but is not the primary differentiator in that environment.
| Spec | On-Engine | Marine | Mining | Rail | Oil & Gas | Hydrogen |
|---|---|---|---|---|---|---|
| -40°C cold floor |
Yes | Yes | Yes | Yes | Yes | Yes |
| 100°C+ hot ceiling |
Yes | - | - | - | - | - |
| 10+ GRMS vibration |
Yes | - | Yes | Yes | - | - |
| MIL-STD-810G shock | - | Yes | - | Yes | - | - |
| IP69K washdown | - | Yes | Yes | - | - | - |
| J1939 CAN | Yes | - | - | - | - | - |
| 100% duty cycle |
Yes | - | Yes | - | - | Yes |
If you are early in the specification process, the buyer's guide below covers each of these specs in detail — what the benchmarks look like, where standard industrial actuators fall short, and what to ask any manufacturer before you commit.
Frequently Asked Questions
What industries is the AMOT EH Series designed for?
The EH Series is designed for on-engine and EGR systems, marine and naval, mining and heavy equipment, locomotive and rail, oil and gas (non-ATEX), and hydrogen and fuel cell applications. The common thread is environments that exceed the temperature, vibration, ingress, or duty cycle limits of standard industrial electric actuators.
What is the temperature range of the AMOT EH Series?
The EH125 operates from -40°C to +100°C. The EHC25 compact model operates from -40°C to +125°C. Both models are rated for cold-start conditions and on-engine or thermal-cycling environments. The -40°C floor is the critical number for northern climates, high-altitude installations, and cold-start applications.
Can the EH Series replace a pneumatic actuator on an engine or in the field?
Yes, if the application does not require ATEX certification. The EH eliminates the compressor, air dryers, filters, and fluid lines that pneumatic systems require. One 24VDC power connection and a J1939 or analog signal replaces the full pneumatic infrastructure. The economic case is total cost of ownership - the upfront cost of the EH is higher, but the infrastructure and maintenance cost of a pneumatic system typically is not.
Does the EH Series work in classified explosive atmospheres?
No. The EH Series carries CE and UKCA certification but is not ATEX or IECEx certified. For Zone 1 or Zone 2 classified areas, a certified alternative is required. Contact AMOT to discuss options. If your installation is outside classified areas, this does not affect your evaluation.
What is the difference between the EH125 and the EHC25?
Torque and temperature ceiling. The EH125 delivers 125 Nm and is rated to +100°C. The EHC25 delivers 25 Nm and is rated to +125°C, making it the better choice for higher-temperature environments and compact installations where 25 Nm is sufficient. Both share identical vibration, shock, IP, duty cycle, and protocol ratings.
What makes the EH Series different from industrial electric actuators?
Purpose-built design for on-engine and mobile environments. Most industrial electric actuators are rated to +70°C, 2g vibration, and IP67 submersion only. The EH is rated to +100°C / +125°C, 14.1 GRMS vibration, MIL-STD-810G 40G shock, IP67 and IP69K, and 100% continuous duty. It also supports J1939 CAN natively, which industrial actuators do not. These are not incremental upgrades - they are different product categories.
Talk to an Engineer
Every application has variables that a spec sheet cannot answer. Tell us your torque requirement, power supply, control protocol, temperature range, and valve type.
