Overview
The JHEMCU RuiBet 55A 4-in-1 ESC is a 3–6S BLHeli_S electronic speed controller designed for FPV drone builds. It supports DShot600 signal input and integrates current sensing (CUR pad) for compatible flight controllers.
Key Features
- 4-in-1 ESC for quad-motor FPV drones (M1/M2/M3/M4 outputs)
- Input voltage: 3–6S (11–27V)
- BLHeli_S firmware (Bluejay target J_H_15; file noted as BLHELI_S J_H_15_REV16_7.HEX)
- Current sensor output: CUR pad
- No BEC (an external 5V/9V supply is required if the build needs it)
Specifications
| Brand | JHEMCU |
| Series | RuiBet |
| Type | 4-in-1 ESC |
| Continuous current | 55A * 4 |
| Input voltage | 3–6S (11–27V) |
| BEC | None |
| Current sensor | Yes |
| Mounting hole spacing | 30.5mm / M4 (30.5MM * 4MM) |
| Board size | 39.5 * 41mm |
| Weight | 14.5g |
| Firmware | BLUEJAY J_H_15 (also listed as BLHELI_S J_H_15_REV16_7.HEX) |
| Signal support (from product title) | DShot600 |
Pad / Wiring Labels
- Motor outputs: M1, M2, M3, M4
- Power pads: + and - for 3–6S LiPo input
- Flight controller pads: VCC, GND, CUR, plus M1/M2/M3/M4 signal pads
What's Included
- JHEMCU RuiBet 4-in-1 ESC board (55A version)
- Capacitor marked 1000uF 35V
- Power leads (red/black)
- ESC-to-flight-controller cable/harness
- XT60 connector (as supplied)
- Install accessories such as silicone grommets and heat-shrink (as supplied)
For compatibility checks or wiring support, contact [email protected] or visit https://rcdrone.top/.
Variant Reference (from provided option values / images)
| Available options | 45A; 50A; 55A; 60A; 65A |
| Model | RuiBet45A | RuiBet55A | RuiBet60A | RuiBet65A |
| Input voltage | 3–6S (11–27V) | 3–6S (11–27V) | 3–6S (11–27V) | 3–6S (11–27V) |
| Continuous current | 45A * 4 | 55A * 4 | 60A * 4 | 65A * 4 |
| BEC | None | None | None | None |
| Current sensor | Yes | Yes | Yes | Yes |
| Mounting hole spacing | 30.5MM / M4 | 30.5MM / M4 | 30.5MM / 4MM | 30.5MM / 4MM |
| Outer size | 39.5 * 41MM | 39.5 * 41MM | 43 * 44.4MM | 43 * 44.4MM |
| Firmware (listed) | BLHELI_S J_H_15_REV16_7.HEX | |||
| Weight | 14.5g | 14.5g | 15.5g | 15.5g |
Details

Designed for 3–6S FPV builds, the RuiBet 55A 4-in-1 ESC combines four motor channels on one compact stack-friendly board.

Pad labels for motor outputs and flight-controller wiring are printed on the board to speed up clean, reliable soldering.

Large power pads and clearly separated edge pads make it easier to route battery leads and motor wires on tight builds.

Lightweight 4-in-1 layout helps keep all-up weight down while retaining full 3–6S capability.

Included capacitor, wiring, and harness simplify installation; add an external 5V/9V supply if your build requires BEC power.


A straightforward wiring layout connects M1–M4 motor outputs, battery +/– input, and the CUR pad for current sensing on compatible flight controllers.


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