The Hobbywing QUICRUN Fusion SE 1200KV combines a brushless ESC and 540-size motor into one integrated FOC power system for 1/10 RC crawlers and scale trail trucks. The 1200KV version is particularly well suited to crawler builds that prioritize fine low-speed throttle control, controlled wheel speed and smooth technical crawling over outright speed.
With 2-3S LiPo support, a 40A continuous current rating, RPM / Throttle Matching, adjustable drag brake, a 6V / 7.4V 4A BEC and IP67 protection, the Fusion SE delivers the core benefits of Hobbywing's integrated crawler platform in a relatively simple, compact package.
Quick Fit Check
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Best suited for: 1/10 RC crawlers, rock crawlers and scale trail trucks
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System type: Sensored FOC brushless ESC + motor 2-in-1 system
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Motor KV: 1200KV
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Continuous / Peak Current: 40A / 120A
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Battery: 2-3S LiPo or 6-9 cell NiMH
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Motor size: 36mm diameter × 58.1mm length
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Shaft: 3.175mm diameter × 16.5mm exposed length
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BEC: 6V / 7.4V adjustable, 4A continuous
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Battery connector: XT60
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Protection rating: IP67
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Programming: Hobbywing LED Program Box
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Best use case: Builds that prioritize low-speed precision rather than higher wheel speed
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Important: Confirm motor clearance, mounting geometry, shaft position and drivetrain gearing before installation.
Product Specifications
| Product Name |
Hobbywing QUICRUN Fusion SE 1200KV |
| Product Number |
30404318 |
| Application |
1/10 RC crawler |
| System Type |
Sensored FOC brushless ESC & motor 2-in-1 system |
| Continuous / Peak Current |
40A / 120A |
| Battery Support |
2-3S LiPo / 6-9 cell NiMH |
| Motor KV |
1200KV |
| Motor Poles |
4 poles |
| BEC Output |
6V / 7.4V adjustable, 4A continuous, switch-mode |
| Motor Diameter / Length |
36mm × 58.1mm |
| Shaft Diameter / Exposed Length |
3.175mm / 16.5mm |
| Weight |
201g including wires and connectors |
| Power Wires |
Red 14AWG 200mm × 1 / Black 14AWG 200mm × 1 |
| Battery Connector |
XT60 |
| Protection Rating |
IP67 |
| Programming Port |
Independent programming port located at the electronic switch |
| Supported Programmer |
Hobbywing LED Program Box |
Why Choose the 1200KV Fusion SE?
The 1200KV version is aimed at crawler setups where controlled wheel speed and fine throttle resolution are priorities. A lower KV motor produces fewer unloaded RPM per volt than the 1800KV version, making it easier to build a drivetrain around deliberate, low-speed crawling behavior.
That does not mean the 1200KV version automatically produces more usable wheel torque in every vehicle. Final crawling behavior depends on battery voltage, pinion size, spur gear, axle ratio, tire diameter and vehicle weight. The practical advantage is that the lower motor speed provides a useful foundation for technical crawler gearing.
Integrated ESC and Motor for a Cleaner Crawler Layout
The Fusion SE places the ESC electronics inside the motor assembly instead of requiring a separate standalone ESC. This removes the normal three external phase wires between ESC and motor and reduces the number of major components that need their own chassis mounting location.
The 36 × 58.1mm body can simplify wiring and leave more usable chassis space for receivers, lighting controllers and scale accessories. Always verify transmission clearance and motor-mount geometry before installation.
FOC Drive for Precise Low-Speed Control
Field-Oriented Control is the main reason the Fusion SE behaves differently from a conventional brushless crawler power system. Instead of focusing on high RPM, the controller continuously manages motor torque to provide smooth response at extremely low speed.
The 1200KV motor complements that control strategy particularly well in crawler setups designed around slow wheel speed, making it easier to make small throttle corrections while approaching ledges, rocks and other technical obstacles.
Quiet and Efficient Sine-Wave Operation
The Fusion SE uses sine-wave drive to deliver smooth motor operation with relatively low acoustic noise and reduced electrical losses.
This is especially valuable during low-speed crawling, where motor noise and abrupt commutation are more noticeable than in higher-speed RC applications. Efficient operation can also help reduce unnecessary heat and make better use of available battery energy.
Actual runtime depends on the complete setup, including gearing, battery capacity, vehicle weight, terrain and driving style, so no fixed runtime improvement should be assumed.
RPM / Throttle Matching for Changing Terrain
When RPM / Throttle Matching is enabled, the ESC uses closed-loop speed control to compensate for changes in vehicle resistance.
When the crawler encounters additional load on a climb, the Fusion SE can automatically adjust motor torque so vehicle speed remains closer to the driver's throttle command. On descents, the same closed-loop behavior can provide a controlled slow-downhill experience.
When RPM / Throttle Matching is disabled, vehicle speed is allowed to change more naturally with terrain resistance, similar to a conventional sensored brushless ESC.
Adjustable Drag Brake for Hill Holding
The Fusion SE separates the final drag brake force from the rate at which that braking force is applied.
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Drag Brake Force: Disabled + Levels 1-8
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Drag Brake Rate: Levels 1-9
Drag Brake Force determines how much braking force is ultimately applied at neutral throttle. Drag Brake Rate determines how quickly that force builds from zero to the selected level.
This makes it possible to configure strong hill holding without necessarily making the initial braking action excessively abrupt.
2-3S LiPo Support
The QUICRUN Fusion SE 1200KV supports 2S and 3S LiPo batteries or 6-9 cell NiMH packs.
The correct battery choice should be made together with the crawler's gearing and desired wheel speed. A 3S setup does not simply make the system “better”; the additional voltage also increases motor RPM, so gearing and drivetrain load should be considered as part of the complete power system.
LiPo cell count can be detected automatically or selected manually through the ESC programming system.
6V / 7.4V Adjustable 4A BEC
The built-in switch-mode BEC provides 4A continuous current and selectable 6V or 7.4V output.
Use 6V for conventional receiver-side electronics that are not designed for high voltage. The 7.4V setting can be used with compatible high-voltage servos and receiver equipment.
Important: every device connected to the receiver power bus must support the selected BEC voltage.
A 3S LiPo should be used when regulated 7.4V BEC output is required. A 2S LiPo does not provide enough voltage headroom to maintain a regulated 7.4V output throughout the complete discharge cycle.
IP67 Protection for Wet and Dusty Trails
The complete Fusion SE power system carries an IP67 protection rating and is designed to withstand the water, dust and debris commonly encountered by trail trucks and rock crawlers.
This makes the system suitable for normal crawler use involving rain, splashes, mud, dust and snow.
IP67 protection does not mean the system should remain submerged for extended periods. Waterproof and dustproof performance may also decline after impacts, seal damage or long-term wear. Clean and dry the power system after wet or muddy operation.
Designed for Demanding Crawler Use
The integrated structure, sealed electronic switch and simplified wiring layout reduce the number of exposed external power-system components compared with a conventional ESC-and-motor installation.
As with any crawler electronics, inspect wiring, connectors, mounting hardware and the switch assembly after hard impacts or demanding wet-weather use.
Nine Adjustable ESC Parameters
The Fusion SE provides nine programmable settings:
- RPM / Throttle Matching
- LiPo Cells
- Cutoff Voltage
- ESC Thermal Protection
- Motor Rotation
- BEC Voltage
- Drag Brake Force
- Drag Brake Rate
- Max. Reverse Force
Programmable LiPo Low-Voltage Protection
The Fusion SE continuously monitors battery voltage while low-voltage protection is enabled.
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Low: 3.0V per cell
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Medium: 3.2V per cell
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High: 3.4V per cell
When battery voltage reaches the selected threshold, output is progressively reduced before eventually being disabled to help protect the LiPo battery from excessive discharge.
Low-voltage protection can be disabled, but it should normally remain enabled when using LiPo batteries.
LED Program Box Programming
The Fusion SE uses a dedicated 3-pin programming interface integrated into the electronic switch. ESC parameters are adjusted through the Hobbywing LED Program Box.
Connect the program box while the Fusion SE is switched off, then power on the system. The ITEM and VALUE controls allow available settings to be selected, and the OK button stores the new value.
The Hobbywing LED Program Box is sold separately unless specifically stated otherwise in the package listing.
The QUICRUN Fusion SE does not support LCD G2, LCD Program Box Pro or Hobbywing OTA programming.
Multiple Protection Functions
The Fusion SE includes several protection functions for normal crawler use:
- Battery low-voltage protection
- ESC thermal protection
- Throttle signal loss protection
- Motor lock-up protection
If the ESC enters low-voltage protection, the red LED flashes continuously. If thermal protection is triggered, the green LED flashes continuously until operating temperature falls sufficiently.
Electronic Switch and Programming Port
Short-press the electronic switch to power on the system and long-press it to switch the system off. The same switch assembly contains the independent programming interface used with the LED Program Box.
The battery should still be physically disconnected after every driving session. Leaving a battery connected can allow the ESC to continue drawing a small amount of current even when switched off.
Receiver Power and External BEC Warning
The red wire in the throttle lead carries the internal BEC output to the receiver and steering servo.
Do not simultaneously connect another BEC or receiver battery to the same receiver power bus while the Fusion SE's internal BEC remains connected.
If a separate receiver power source is required, disconnect the red BEC wire from the Fusion SE throttle lead and insulate it securely before applying external receiver power.
Throttle Calibration
Throttle calibration should be completed before first use and repeated if the transmitter, receiver or throttle-channel settings are changed.
The calibration process stores:
- Neutral position
- Full forward position
- Full reverse position
For safety, remove the pinion gear or otherwise prevent the drivetrain from moving the vehicle during calibration.
Automatic Motor Pairing
The Fusion SE provides an optional automatic motor-pairing process if the motor experiences severe impact, abnormal heating or abnormal power output.
The motor gear must be removed before beginning the pairing process because the motor rotates automatically during calibration.
1200KV vs 1800KV Fusion SE: Which Should You Choose?
Both Fusion SE versions share the same integrated FOC architecture, 40A ESC, 2-3S battery range, 4A BEC, physical dimensions and programming system. The key difference is motor KV.
| 1200KV |
Lower motor RPM per volt; a strong choice for technical crawling and builds prioritizing controlled wheel speed. |
| 1800KV |
Higher motor RPM per volt; better suited when the crawler needs more wheel-speed potential while retaining Fusion SE low-speed control. |
Neither KV is universally better. Final vehicle behavior depends on gearing, battery voltage, tire diameter, vehicle weight and intended terrain.
FAQ
What is the Hobbywing QUICRUN Fusion SE 1200KV?
It is an integrated sensored FOC brushless motor and ESC system designed primarily for 1/10 RC crawlers and trail trucks.
What is the difference between the Fusion SE 1200KV and 1800KV?
The main difference is motor speed per volt. The 1200KV version has lower motor RPM and is particularly attractive for technical crawler setups that prioritize controlled wheel speed. The 1800KV version offers more motor-speed potential. Gearing still plays a major role in final vehicle behavior.
Can the Fusion SE 1200KV run on 3S?
Yes. It supports both 2S and 3S LiPo batteries. Gearing and drivetrain load should be appropriate for the chosen battery voltage.
Does the Fusion SE 1200KV have RPM Matching?
Yes. With RPM / Throttle Matching enabled, closed-loop speed control automatically adjusts motor torque as terrain resistance changes.
Does the Fusion SE have adjustable drag brake?
Yes. Drag Brake Force provides Disabled plus Levels 1-8, while Drag Brake Rate provides Levels 1-9.
Can I use a 7.4V steering servo?
Yes, provided the receiver, servo and all other devices on the receiver power bus support 7.4V. Use a 3S LiPo when regulated 7.4V BEC output is required.
Which programming box works with the Fusion SE?
The Fusion SE supports the Hobbywing LED Program Box through the independent programming port located on the electronic switch.
Does the Fusion SE support LCD or OTA programming?
No. It does not support LCD G2, LCD Program Box Pro or Hobbywing OTA programming.
Is the Fusion SE waterproof?
The power system carries an IP67 protection rating for normal crawler exposure to water and dust. It should not be considered permanently waterproof or suitable for prolonged submersion.
Will the Fusion SE 1200KV fit every 1/10 crawler?
No. Its 36 × 58.1mm body fits many crawler layouts, but transmission clearance, mounting geometry, links, shaft position and surrounding components must be checked for each chassis.
Package Includes
- 1 × Hobbywing QUICRUN Fusion SE 1200KV ESC / Motor 2-in-1 System
LED Program Box, receiver, servo, battery and other crawler electronics are not included unless specifically stated in the product listing.
Important Notice
- Disconnect the battery after every use.
- Never reverse battery polarity.
- Use 7.4V BEC output only with receiver-side electronics rated for that voltage.
- Use a 3S LiPo when regulated 7.4V BEC output is required.
- Do not simultaneously power the receiver from the Fusion SE internal BEC and another BEC or receiver battery unless the power sources are properly isolated.
- Do not allow the external temperature of the system to exceed 90°C / 194°F.
- IP67 does not mean the system should remain submerged for extended periods.
- Remove the pinion gear before throttle calibration or automatic motor pairing where required.
QUICRUN Fusion SE User Manual
Download the Hobbywing QUICRUN Fusion SE User Manual
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