Quick Fit Check
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Continuous / Peak Current: 40A / 60A peak
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Battery: 2-6S LiPo
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BEC: No
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Motor Connectors: 3.5mm gold female connectors
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Battery-Side Connector: Not installed
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Programming: Throttle calibration and Intermediate / High Timing
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Typical Application: 550/650 class multirotors
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Available Asian-Market SKUs: 30901014 and 30901000
The Hobbywing XRotor 40A 6S BLDC ESC is a dedicated brushless electronic speed controller for multirotor and drone propulsion systems. Rated for 40A continuous current and 60A peak current, it supports a wide 2-6S LiPo operating range and is designed primarily for 550/650 class multirotors when the selected motor and propeller load remain within its electrical and thermal limits.
XRotor control software is developed specifically around the frequent motor-speed corrections required during multirotor flight. Key features include rapid throttle response, optimized compatibility with multirotor brushless motors, a twisted-pair throttle signal cable, low-resistance MOSFET design and support for throttle signal frequencies up to 621Hz.
This page combines two XRotor 40A variants: 30901014 Version A and 30901000 Version B. Their core electrical ratings, supported battery range, BEC configuration and intended application are the same, but their motor-output arrangement, dimensions and weight differ. Compare the two versions below before ordering.
Hobbywing XRotor 40A Specifications
| Continuous Current |
40A |
| Peak Current |
60A |
| Battery |
2-6S LiPo |
| BEC Output |
No BEC |
| Input Power Wires |
Red 16AWG × 150mm × 1; Black 16AWG × 150mm × 1 |
| Battery-Side Connector |
None |
| Motor Connectors |
3.5mm gold female connectors |
| Throttle Range Calibration |
Supported |
| Programming Method |
Transmitter throttle-stick programming |
| Timing |
Intermediate / High |
| DEO |
Not supported |
| OneShot Mode |
Not supported |
| LED Color Programming |
Not supported |
| Motor Rotation Programming |
Not supported |
| Typical Application |
550/650 class multirotors |
Version A vs Version B
The two XRotor 40A variants share the same 40A / 60A electrical rating, 2-6S LiPo range, no-BEC configuration and 550/650 class reference application. The important difference is how the motor side of the ESC is configured.
| Specification |
Version A |
Version B |
| Stock Number |
30901014 |
30901000 |
| Continuous / Peak Current |
40A / 60A |
40A / 60A |
| LiPo Input |
2-6S |
2-6S |
| Motor Output Wires |
Black 16AWG × 75mm × 3 |
No separate output wires |
| Motor Connectors |
3.5mm gold female connectors |
3.5mm gold female connectors at ESC output |
| Dimensions |
56 × 25.2 × 12.4mm |
65.5 × 25.0 × 8.7mm |
| Weight |
Approx. 32g |
Approx. 28g |
Rapid Throttle Response for Multirotor Control
The XRotor 40A uses a dedicated control program developed for multirotor ESC operation. A multirotor flight controller continuously adjusts the speed of individual motors to control pitch, roll, yaw, altitude and aircraft stability, making predictable throttle response an important part of the propulsion system.
Hobbywing's XRotor firmware is designed around these repeated motor-speed corrections rather than simply adapting a conventional surface-model or airplane ESC control strategy.
Simple Setup with Preset Multirotor Settings
Most XRotor 40A operating parameters are preset, helping simplify installation and setup. The primary adjustable parameter is motor Timing, which can be selected between Intermediate and High through transmitter throttle-stick programming.
Intermediate Timing is the default setting and is suitable for most motors, generally providing a useful balance between efficiency and operating temperature. High Timing can increase motor RPM where required, but it can also increase motor temperature.
After changing Timing, check both the motor and ESC carefully under the intended load before normal flight operation.
Optimized for Multirotor Brushless Motors
Hobbywing developed XRotor software for the brushless motor characteristics commonly used in multirotor aircraft, including disc-type motors. This helps provide suitable control behavior as the ESC responds continuously to commands from the flight controller.
Compatibility still needs to be evaluated as a complete propulsion system. Motor KV, propeller diameter and pitch, LiPo voltage, aircraft weight and cooling can all significantly affect motor current and ESC temperature.
Twisted-Pair Throttle Cable Helps Reduce Signal Interference
The XRotor 40A uses a twisted-pair throttle signal cable designed to reduce crosstalk and interference during signal transmission.
This is useful in multirotor installations where several ESCs, high-current battery wires, motors, power-distribution components and flight-control electronics can be positioned close together. Reducing interference helps support reliable communication between the flight controller and ESC.
Low-Resistance MOSFET Design
The XRotor 40A combines low-resistance MOSFETs with a dedicated MOSFET drive design to provide efficient switching and dependable current handling for multirotor operation.
The ESC is rated for 40A continuous current and 60A peak current. These figures define the ESC's electrical capability rather than a recommended current target for every aircraft.
Actual load depends on battery voltage, motor KV, propeller size and pitch, aircraft weight, airflow and ambient temperature. Verify real current draw with the intended propulsion setup and maintain suitable electrical and thermal margin.
Throttle Signal Frequency up to 621Hz
The Hobbywing XRotor 40A is compatible with various flight-control systems and supports throttle signal frequencies of up to 621Hz, allowing frequent throttle commands as the flight controller manages motor speed during multirotor operation.
Throttle Signal Note: Hobbywing states that throttle signals above 500Hz are non-standard signals. Confirm that the selected flight controller and its throttle-output configuration support the intended frequency before use.
No Built-In BEC
The XRotor 40A is a no-BEC multirotor ESC. It controls the brushless motor but does not provide regulated power for the flight controller, receiver or other onboard electronics.
A separate regulated power module, UBEC, power-distribution system or another appropriate power source must therefore be used where required by the aircraft's electrical architecture.
Always verify the voltage and current requirements of the flight controller and other onboard electronics before connecting power.
Throttle Range Calibration & Timing Programming
Throttle-range calibration should be performed when first installing a new XRotor ESC or when changing to another transmitter or control setup.
The XRotor 40A can also be programmed using the transmitter throttle stick and motor warning tones. Available programming functions include throttle calibration, Intermediate Timing and High Timing.
| Function |
XRotor 40A |
| Throttle Range Calibration |
Supported |
| Transmitter Stick Programming |
Supported |
| Intermediate Timing |
Supported / Default |
| High Timing |
Supported |
| DEO |
Not supported |
| OneShot Mode |
Not supported |
| LED Color Programming |
Not supported |
| Motor Rotation Programming |
Not supported |
Safety: Remove all propellers before throttle calibration, ESC programming or initial motor testing. Multirotor power systems can start unexpectedly if the throttle or signal configuration is incorrect.
Built-In Protection Functions
Start-Up Protection
If the ESC cannot start the motor normally within approximately two seconds while throttle is increased, motor output is stopped. Return the throttle to the bottom position before attempting another start. Possible causes include a poor motor connection, blocked propeller or other mechanical obstruction.
Overload Protection
If the load suddenly increases to an unusually high level, the ESC can cut motor output. Normal operation will not resume until the throttle is returned appropriately. The ESC can also attempt to restart when synchronization between the motor and ESC is lost.
Throttle Signal Loss Protection
If the ESC detects loss of throttle signal for more than approximately 0.25 second, it cuts motor output. Corresponding output can resume once a normal signal is received again.
Protection functions provide an additional safeguard, but they do not replace correct battery, motor, propeller, ESC, wiring and cooling selection.
Designed for 550/650 Class Multirotors
Hobbywing identifies the XRotor 40A as a reference ESC for 550/650 class multirotors and quadcopters. Compared with the XRotor 20A, the 40A model moves into a higher-current class and supports a broader 2-6S LiPo voltage range.
Frame size is only a reference. Two 550 or 650 class aircraft can place very different electrical loads on their ESCs depending on motor KV, propeller diameter and pitch, LiPo voltage, aircraft mass and flight style.
What to Check Before Buying
- Confirm that the intended battery is within the 2-6S LiPo input range.
- Check the motor manufacturer's ESC recommendation.
- Verify actual motor current with the intended battery and propeller.
- Maintain appropriate current and thermal margin below the ESC limits.
- Choose between 30901014 and 30901000 according to motor-wire layout.
- Confirm mounting dimensions and wire clearance for the selected version.
- Provide adequate airflow and cooling around the ESC.
- Check battery connector and power-distribution current capability.
- Confirm flight-controller throttle signal compatibility.
- Provide a separate regulated flight-controller power source because the ESC has no BEC.
Hobbywing XRotor 40A Manual
The official Hobbywing XRotor multirotor ESC manual covers wiring, throttle-range calibration, Intermediate and High Timing programming, normal start-up, protection behavior and troubleshooting for the XRotor 40A.
Download the Hobbywing XRotor 40A ESC Manual
Frequently Asked Questions
What battery does the Hobbywing XRotor 40A support?
The XRotor 40A supports 2-6S LiPo batteries. The motor and propeller combination must also be appropriate for the selected battery voltage and remain within the ESC's current and thermal limits.
Can the XRotor 40A run on 6S?
Yes. The XRotor 40A is rated for up to 6S LiPo operation. Current draw generally changes when battery voltage changes, so a motor and propeller combination that is suitable on a lower cell count should not automatically be assumed safe on 6S.
What is the current rating of the XRotor 40A?
The ESC is rated for 40A continuous current and 60A peak current.
Does the XRotor 40A have a BEC?
No. The XRotor 40A has no built-in BEC. A suitable separate regulated power arrangement is required for the flight controller, receiver and other onboard electronics where applicable.
Does the XRotor 40A include a battery connector?
No. The red and black input power wires are supplied without a battery-side connector. Use an appropriately rated connector or power-distribution system and verify polarity before powering the aircraft.
What motor connectors does the XRotor 40A use?
Both Asian-market versions use 3.5mm gold female motor connectors. Version A, SKU 30901014, provides three 75mm 16AWG motor output leads, while Version B, SKU 30901000, has no separate motor output wires and places the connectors at the ESC output.
What is the difference between 30901014 and 30901000?
Both share the same 40A / 60A electrical rating, 2-6S LiPo input range and no-BEC architecture. SKU 30901014 Asian Version A has three 75mm motor output wires and measures approximately 56 × 25.2 × 12.4mm at about 32g. SKU 30901000 Asian Version B has no separate motor output wires and measures approximately 65.5 × 25.0 × 8.7mm at about 28g.
Can the XRotor 40A be programmed?
Yes. Throttle-range calibration and transmitter throttle-stick programming are supported. Motor Timing can be selected between Intermediate and High, with Intermediate Timing used as the default setting.
Does the XRotor 40A support OneShot?
No. Hobbywing lists OneShot Mode as not supported on these XRotor 40A variants.
Can the XRotor 40A accept a 621Hz throttle signal?
Yes. Hobbywing states that it supports throttle signal frequencies up to 621Hz. Signals above 500Hz are identified by Hobbywing as non-standard, so flight-controller compatibility and configuration should be verified before use.
Is the 550/650 class recommendation a guaranteed fit?
No. It is a reference application rather than a universal fitment guarantee. Always verify battery voltage, motor current, propeller load, cooling, wiring and mounting requirements for the complete propulsion system.
Note: Battery, battery-side connector, motor, propeller, flight controller, external regulated power supply and other power-system components are not included unless otherwise stated in the product options.
More Hobbywing XRotor & Drone ESC Options
Compare this model with other Hobbywing XRotor ESCs as the CNHL XRotor range expands across different current and voltage classes.
You can also browse our wider drone ESC collection for multirotor and UAV electronic speed controllers, or explore all Hobbywing ESCs for other RC power-system applications.
