FrSky Xact ACT Coreless 5400 Series HV Servos – S5412H, S5414H & S5415H

FrSky ACT 5400 Series Coreless HV Servos

The FrSky ACT 5400 Series Coreless HV Servos deliver fast response, high torque, and dependable control for sport, 3D, aerobatic, and giant-scale RC aircraft. Available in three models — S5412H, S5414H, and S5415H — these high-voltage servos are designed for pilots who need smooth movement, strong holding power, and reliable performance in demanding flight applications.

Built with a coreless motor, precision potentiometer feedback system, fully CNC-machined aluminum case, metal gear train, dual precision ball bearings, and integrated Soft Start technology, the ACT 5400 Series is engineered to handle sustained control-surface loads flight after flight.

Recommended Applications

• 50cc–120cc giant-scale RC airplanes
• IMAC and precision aerobatic aircraft
• Large 3D and sport aircraft
• Turbine jets
• High-load rudder, elevator, and aileron surfaces
• Scale warbirds and large sport models

Key Features – All Models

• Coreless motor — faster acceleration and smoother operation compared to conventional brushed servo motors
• Precision potentiometer feedback system — smooth, accurate control response
• Soft Start technology — reduces startup shock loads on gears, linkages, and control surfaces at power-up
• Metal gear train — heavy-duty durability under sustained high-load conditions
• Fully CNC-machined aluminum case — rigid construction with excellent heat dissipation
• Dual precision ball bearings — smooth, accurate output shaft support
• High-voltage operation — 4.8V to 8.4V compatible
• 333Hz refresh rate — fast, responsive signal processing
• Φ6 25T horn spline — compatible with standard 25T servo arms

Performance Specifications by Model

Which Model Should I Choose?

• S5412H: Best where speed is the priority. With 0.05 sec/60° at 8.4V, it works well for ailerons and lighter control surfaces on 30cc–50cc class models.
• S5414H: Strong balance of torque and speed for large rudder and elevator surfaces. Excellent all-around choice for 50cc–100cc giant-scale aircraft.
• S5415H: Maximum torque option at up to 986 oz-in at 8.4V. Best for heavy control surfaces on 100cc–120cc aircraft, turbine jets, and large scale warbirds.

General Specifications – All Models

Why Choose a Coreless Servo?

Coreless motors eliminate the heavy iron core found in conventional brushed servo motors, resulting in faster acceleration, smoother operation, and improved responsiveness. This makes the ACT 5400 Series a strong choice for pilots who want precise control feel and fast reaction from their aircraft.

Soft Start Technology

All three ACT 5400 Series models include integrated Soft Start, which gradually initializes servo movement at power-on instead of snapping immediately to position. This helps reduce stress on gears, pushrods, control horns, hinges, and large control surfaces during startup.

Important Setup Notes

• Use a properly rated receiver battery, regulator, or power distribution system for HV servo operation.
• At 8.4V, stall current can reach 6.6A, so power system capacity should be planned accordingly.
• For best results, use rigid linkages and heavy-duty servo arms rated for giant-scale loads.
• Dual battery systems are recommended for large aircraft running multiple HV servos simultaneously.
• Always verify direction, travel, centering, and linkage geometry before flight.

What's in the Box

• FrSky ACT 5400 Series Coreless HV Servo — selected model: S5412H, S5414H, or S5415H
• Servo arms
• Mounting screws
• Factory packaging