EH Series: Quarter-Turn Electric Actuator

The AMOT EH Series is a quarter-turn electric actuator built for the conditions that eliminate standard units: engine-mounted systems, offshore platforms, mine sites, rail, and any environment where vibration, heat, and continuous duty are constants, not exceptions.

Two models. Over one million tested life cycles. IP67/IP69K sealed. CANbus J1939 native. 24VDC. When reliability cannot be compromised, engineers across oil and gas, marine, rail, mining, and power generation specify the EH Series to keep mission-critical systems running without interruption.

Two Models. One Standard.

Pneumatic and hydraulic actuators require compressors, regulators, fluid lines, and a maintenance program. The EH Series eliminates all of it. One 24VDC connection. No air supply. No hydraulic infrastructure. Fewer failure points, simpler installation, and less to go wrong in the field.

The EH Series includes two models, each built for a different application profile.

The EH125 is the higher-torque model: 125 Nm (1,106 in-lb), ISO 5211 F07 and F10 mounting, and the most complete I/O configuration in the series — two analog/digital inputs, two analog outputs, four digital outputs, and full CANbus J1939 integration. Choose the EH125 when breakaway torque is significant or your control system requires more signal flexibility. Weight: 11.0 kg. Operating temperature: −40°C to 100°C (−40°F to 212°F).

The EHC25 delivers 25 Nm in a 4.0 kg anodized aluminum body with an 8-pin bulkhead connector and ISO 5211 F07 mounting. Its streamlined I/O — one analog/digital input, one analog output — suits OEM builds where space is tight and weight is a real constraint. Operating temperature: −40°C to 125°C (−40°F to 257°F).

Both models run at 100% duty cycle at maximum rated load and temperature with continuous modulation. Both carry IP67 and IP69K ratings and are CE/UKCA certified. Both mount in any orientation and include a Hall Effect position sensor, motor thermal protection, and manual override as standard.

Features and Benefits

• 100% duty cycle. No performance limits at rated load. The EH Series runs continuous modulation at maximum load and maximum temperature. Critical valve positions hold steady no matter how long the operation runs. Motor thermal protection is fitted as standard on both models.
• IP67 and IP69K ingress protection. Fully sealed against immersion and high-pressure washdown. Internal components stay protected in the environments where actuators fail most often: deck washdowns, steam cleaning, and water ingress from any direction.
• MIL-STD-810G shock and vibration resistance. 14.1 GRMS vibration resistance and 40G mechanical shock. The EH Series handles the sustained vibration and impact loads common in engine-mounted, locomotive, and marine installations.
• Native CANbus J1939 integration. Direct connection to engine and vehicle control systems. No signal converters. No extra wiring. The EH Series communicates in the same protocol as the ECU.
• Non-contact Hall Effect position sensor. No mechanical wear on the sensing element. Position feedback stays accurate across 1M+ tested life cycles.
• Software-configurable limit switches. Open and closed positions are set in software. Faster commissioning, easier field reconfiguration, and no manual adjustment required.
• Configurable failure state. Each model can be configured to fail in place, turn clockwise, or turn counterclockwise on signal loss — set at the time of order.
• Manual override. Both models include a mechanical manual override for repositioning the valve without power.

EH Series Frequently Asked Questions

What is the torque range of the EH Series?

The EH Series comes in two torque ratings. The EH125 delivers 125 Nm (1,106 in-lb) and is the right choice when breakaway torque is a factor or valve sizing demands higher output. The EHC25 delivers 25 Nm in a compact 4.0 kg body designed for OEM and space-constrained installations.

What control signals does the EH Series support?

Both models support 4–20 mA, 0–10 VDC, PWM, and CANbus J1939. Control and feedback signal types are selected at time of order. The J1939 CAN option connects directly to engine and vehicle control networks with no external signal converters.

What is the stroke time for the EH Series?

The EH125 has a minimum configurable stroke time of 6 seconds. The EHC25 strokes in 4 seconds. Both models are configurable for speed within their rated ranges.

What valve types is the EH Series compatible with?

The EH Series is compatible with ball valves, butterfly valves, and plug valves. Both models support ISO 5211 F07 mounting. The EH125 also supports F10. A high-vibration mount pattern is available on both.

What are the disadvantages of standard electric actuators?

Most electric actuators are not built for continuous modulation, high vibration, or wide temperature ranges. They hit thermal limits under sustained duty, use mechanical position sensors that wear down, and lack the ingress protection needed for washdown and outdoor environments. The EH Series addresses each of these: 100% duty cycle at rated load and temperature, a non-contact Hall Effect sensor rated to 1M+ cycles, and IP67/IP69K sealing.

What is the difference between a quarter-turn and a multi-turn actuator?

A quarter-turn actuator rotates 90 degrees to move a valve between fully open and fully closed. It is the standard choice for ball valves, butterfly valves, and plug valves. A multi-turn actuator rotates multiple times to drive gate valves, globe valves, and other linear-travel valves.

Start Your EH Series Configuration

3D CAD files and full datasheets are available for both the EH125 and EHC25 models, ready to download and integrate into your system design. When you have the details you need, request a quote or contact an AMOT engineer to confirm the right configuration for your application.

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