> For the complete documentation index, see [llms.txt](https://docs.arkelectron.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.arkelectron.com/products/electronic-speed-controller/ark-4in1-esc.md).

# ARK 4IN1 ESC

NDAA compliant, made in the USA, 4 in 1 electronic speed controller running open source ARK32 firmware.

{% hint style="danger" %}
**Before first use**, configure **KV**, **Pole Count**, and **Ramp Rate** for each motor channel in the [ARK32 Configurator](https://ark32.arkelectron.com/). The KV/pole defaults will not match your motor. Factory ramp is 2 %/ms — lower it for large props. See [ARK32 Configuration](/products/electronic-speed-controller/ark-4in1-esc/ark32-configuration.md).
{% endhint %}

This ESC runs [**ARK32**](https://github.com/ARK-Electronics/ARK32). Use ARK32 on this board. See [Why ARK32](/products/electronic-speed-controller/ark-4in1-esc/firmware.md#why-ark32).

**Specifications:**

* Voltage
  * 3s – 8s Lithium Polymer Battery Input
  * 6V Minimum
  * 65V Absolute Maximum
* Current Per Motor
  * 50A Continuous
  * 75A Burst Current
* Input Protocols
  * Dshot (300, 600)
    * Bi-directional Dshot
    * KISS Serial Telemetry
  * PWM
* Dimensions
  * 43.00mm x 40.50mm x 7.60mm
  * 30.5mm Mounting Pattern
* Weight
  * 14.5g

**Capacitance:**

The ARK 4IN1 ESC has 450µF of bulk capacitance built in, which is sufficient for most 3S–6S installations with short battery leads.

{% hint style="warning" %}
For 8S and above, add an external bulk capacitor across the battery input to keep switching and inrush transients below the 65V absolute maximum. Long battery leads increase inductance and make transients worse at any voltage.
{% endhint %}

{% content-ref url="/pages/n6YlyGRFz0S4n9wwBw7w" %}
[Pinout](/products/electronic-speed-controller/ark-4in1-esc/pinout.md)
{% endcontent-ref %}

{% content-ref url="/pages/2WEpmwEk9qQBWRoqPqcv" %}
[Firmware](/products/electronic-speed-controller/ark-4in1-esc/firmware.md)
{% endcontent-ref %}

{% content-ref url="/pages/xu15sk9Nia1VuvWWiP2d" %}
[PWM Calibration](/products/electronic-speed-controller/ark-4in1-esc/pwm-calibration.md)
{% endcontent-ref %}

{% content-ref url="/pages/OA41i2YJTdQdxmWQs0Dv" %}
[3D Models](/products/electronic-speed-controller/ark-4in1-esc/3d-models.md)
{% endcontent-ref %}


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