The Hobbywing QUICRUN Fusion SE 1800KV combines a brushless ESC and 540-size motor into one compact FOC power system designed for 1/10 RC crawlers and trail trucks. Its integrated layout reduces wiring clutter while delivering the smooth low-speed control, strong crawler torque and closed-loop RPM control that define Hobbywing's Fusion platform.
With 2-3S LiPo support, a 40A continuous current rating, adjustable 6V / 7.4V 4A BEC, IP67 protection, active drag brake adjustment and LED Program Box tuning, the Fusion SE is a practical choice for crawler builds where precise low-speed behavior matters more than maximum vehicle speed.
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: 1800KV
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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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Important: Check motor clearance, mounting position, gearbox geometry and shaft dimensions before installation.
Product Specifications
| Product Name |
Hobbywing QUICRUN Fusion SE 1800KV |
| Product Number |
30404317 |
| Application |
1/10 RC crawler |
| Motor / ESC 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 |
1800KV |
| 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 |
Integrated ESC and Motor for a Cleaner Crawler Layout
The Fusion SE integrates the ESC electronics into the motor assembly instead of using a conventional separate ESC and motor. This reduces the number of major components that need to be mounted inside the chassis and removes the three external motor phase wires normally required between a standalone ESC and brushless motor.
The result is a simpler wiring layout that can free useful chassis space for the receiver, lighting controller, scale interior or other crawler electronics.
Its motor body measures 36mm in diameter and 58.1mm long. The compact integrated format fits many 1/10 crawler layouts, but chassis compatibility should still be checked individually rather than assuming universal fitment.
FOC Control for Smooth Low-Speed Crawling
The QUICRUN Fusion SE uses Field-Oriented Control to manage motor torque smoothly across the crawler's low-speed range. The system is particularly useful when the vehicle needs to move slowly over rocks, roots and technical obstacles without abrupt throttle response.
FOC control gives the driver strong low-RPM torque and fine throttle modulation while maintaining a smooth, predictable driving feel. This makes the Fusion SE especially suited to crawling applications where precise movement is more important than maximum speed.
Quiet and Efficient Sine-Wave Drive
The sine-wave drive strategy used by the Fusion SE helps the motor operate smoothly and quietly while reducing unnecessary electrical losses and heat.
Lower operating noise is particularly noticeable during technical crawling, where the vehicle spends much of its time running at low motor RPM. Improved efficiency can also help make better use of available battery energy, although actual runtime still depends on battery capacity, gearing, vehicle weight, terrain and driving style.
RPM / Throttle Matching for Controlled Climbing and Descending
With RPM / Throttle Matching enabled, the Fusion SE uses closed-loop speed control to automatically adjust motor torque as vehicle resistance changes.
When the crawler encounters a steeper climb or additional resistance, the system can increase torque output to keep vehicle speed closer to the driver's throttle request. On descents, the same closed-loop strategy provides a more controlled slow-downhill feel instead of allowing gravity alone to determine vehicle speed.
When RPM / Throttle Matching is disabled, the system behaves more like a conventional sensored brushless ESC: changes in terrain load can cause vehicle speed to change accordingly.
Adjustable Drag Brake for Better Hill Holding
The Fusion SE provides separate adjustment for Drag Brake Force and Drag Brake Rate, allowing the crawler's neutral-throttle braking behavior to be tuned for different terrain and driving styles.
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Drag Brake Force: Disabled plus Levels 1-8
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Drag Brake Rate: Levels 1-9
Drag Brake Force determines the final braking force applied when the throttle returns to neutral. Drag Brake Rate controls how quickly that braking force builds.
This separation allows a crawler to use strong holding force without necessarily applying that force abruptly, which can improve stability and drivetrain feel on steep technical sections.
2-3S LiPo Support
The Hobbywing Fusion SE 1800KV supports 2S and 3S LiPo batteries as well as 6-9 cell NiMH packs.
LiPo cell count can be detected automatically or manually selected. If the same battery cell count is used consistently, manually selecting the cell count can reduce the risk of a heavily discharged 3S pack being incorrectly identified as a charged 2S pack.
Adjustable 6V / 7.4V 4A BEC
The integrated switch-mode BEC provides 4A continuous output with selectable 6V or 7.4V settings.
6V is intended for conventional receiver and servo systems, while 7.4V can be used with compatible high-voltage equipment.
Important: the 7.4V setting should only be used when the receiver, steering servo and every connected device support that voltage.
For the Fusion SE, a 3S LiPo is required when a regulated 7.4V BEC output is needed. A 2S pack does not provide sufficient voltage headroom to maintain the full 7.4V output throughout its discharge cycle.
IP67 Protection for Wet and Dusty Trails
The complete Fusion SE power system carries an IP67 protection rating, giving it strong resistance to water and dust during normal crawler use.
This makes the system suitable for trails involving splashes, mud, dust, snow and other demanding outdoor conditions.
IP67 protection should not be interpreted as permission for prolonged underwater operation. Protection performance can also decline over time due to aging, impact damage, worn seals or improper maintenance. Clean and dry the vehicle after wet or muddy use and inspect wiring and connectors before storage.
Nine Adjustable ESC Parameters
The Fusion SE provides nine programmable settings for basic crawler setup and tuning:
- RPM / Throttle Matching
- LiPo Cells
- Cutoff Voltage
- ESC Thermal Protection
- Motor Rotation
- BEC Voltage
- Drag Brake Force
- Drag Brake Rate
- Max. Reverse Force
Programmable Low-Voltage Cutoff
The low-voltage protection system continuously monitors LiPo battery voltage and reduces power when the selected threshold is reached.
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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
Low-voltage protection can also be disabled, but Hobbywing does not recommend disabling it when using LiPo batteries because over-discharge can permanently damage the pack.
LED Program Box Programming
The Fusion SE uses an independent programming interface integrated into the electronic switch. ESC parameters are adjusted with the Hobbywing LED Program Box.
With the system switched off, connect the programming cable between the switch's 3-pin programming interface and the LED Program Box. After powering on the system, the program box displays the available settings and values.
The LED Program Box is not included unless specifically stated in the product package.
The Fusion SE does not support the LCD Program Box G2, LCD Program Box Pro or Hobbywing OTA Programmer.
Multiple Protection Functions
Built-in protection functions help protect the Fusion SE against several common crawler power-system problems:
- Battery low-voltage protection
- ESC thermal / overheat protection
- Throttle signal loss protection
- Motor lock-up protection
LED status signals also help identify low-voltage protection, thermal protection and throttle-signal problems during troubleshooting.
Electronic Switch and Independent Programming Port
The electronic switch provides normal system power control while also housing the independent programming interface used by the LED Program Box.
Short-press the switch to power the system on and long-press it to shut the system down. The battery should still be physically disconnected after every driving session.
Receiver Power and External BEC Warning
The red wire in the Fusion SE throttle lead supplies BEC power to the receiver and steering servo. Do not simultaneously power the same receiver bus from another BEC or receiver battery while leaving this BEC connection active.
If an independent receiver power source is required, remove or disconnect the red BEC wire from the throttle lead, insulate it securely and keep it isolated before applying the second power source.
Throttle Calibration
Throttle-range calibration should be completed before first use and repeated whenever transmitter throttle settings, transmitter, receiver, TRIM, D/R or EPA settings are changed.
The calibration procedure stores three positions:
- Neutral
- Full forward
- Full reverse
For safety, remove the pinion gear or otherwise ensure that the drivetrain cannot move the vehicle while performing calibration.
Automatic Motor Pairing
If the Fusion SE experiences severe impact, abnormal heating or abnormal power output, Hobbywing provides an optional automatic motor-pairing procedure.
The motor gear must be removed before pairing. Once the system enters pairing mode, the motor will rotate automatically during the matching process. Reconnect the throttle lead and confirm correct operation after pairing is complete.
FAQ
What is the Hobbywing QUICRUN Fusion SE 1800KV?
It is an integrated 2-in-1 crawler power system combining a sensored FOC brushless motor and ESC in one 540-size assembly.
What battery does the Fusion SE 1800KV use?
It supports 2S and 3S LiPo batteries or 6-9 cell NiMH packs.
Is the Fusion SE designed for high-speed RC cars?
No. Its primary application is 1/10 RC crawling and trail driving, where smooth low-speed torque, precise throttle control, drag brake behavior and compact installation are more important than maximum speed.
Does the Fusion SE have cruise-control-style RPM Matching?
Yes. When RPM / Throttle Matching is enabled, closed-loop control automatically adjusts motor torque as vehicle resistance changes so vehicle speed stays closer to the driver's throttle request.
Can the Fusion SE hold a crawler on a steep hill?
Its adjustable drag brake is designed to provide strong hill-holding capability. Drag Brake Force and Drag Brake Rate can be tuned separately to balance holding strength and how quickly braking is applied.
Can I run a 7.4V servo?
The built-in BEC can be set to 7.4V when the receiver, servo and connected electronics all support that voltage. A 3S LiPo should be used 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 at the electronic switch. It does not support LCD G2, LCD Pro or OTA programming.
Is the Fusion SE waterproof?
The complete system carries an IP67 protection rating for normal exposure to water and dust. It should not be treated as permanently waterproof or intentionally left submerged for extended periods.
Will the Fusion SE fit every 1/10 crawler?
No universal-fit claim should be made. Its 36 × 58.1mm integrated body fits many 1/10 crawler layouts, but motor mounting, transmission clearance, link geometry, shaft position and surrounding components should always be checked before purchase.
LED Program Box, battery, receiver, servo and other RC electronics are not included unless specifically stated in the product listing.
Important Notice
- Disconnect the battery after every use. The system can continue drawing a small amount of current even when switched off.
- Never reverse battery polarity. Reverse-polarity damage can permanently damage the power system.
- Use 7.4V BEC output only with receiver-side electronics rated for 7.4V operation.
- Use a 3S LiPo when regulated 7.4V BEC output is required.
- Do not feed the receiver simultaneously from the internal BEC and an external BEC or receiver battery unless the power sources are correctly isolated.
- Do not allow external system temperature to exceed 90°C / 194°F.
- IP67 protection does not mean the product should remain submerged for extended periods.
- Remove the pinion gear before calibration or automatic motor pairing where required by the manual.
QUICRUN Fusion SE User Manual
Download the Hobbywing QUICRUN Fusion SE User Manual
Complete Your RC Crawler Power Setup
Brushless ESC Collection
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