We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Small black rectangular electronic speed controller with cooling fan and red EC5 connectors

WUQ

WUQ BLX120 Brushless 4S ESC ARA390264

SKU CH-E7SX-MHG8A

A 120A waterproof brushless ESC with built-in fan, EC5 connectors and 6V 3A BEC for 3S or 4S LiPo power

  • TypeModels & Kits
  • 120A waterproof ESC delivers consistent power control
  • 4S LiPo ready with 3.4V per cell low voltage cut-off
  • Built-in cooling fan reduces heat during intense driving
  • EC5 connectors and 12AWG wires ensure reliable high-current connections
  • 6V 3A BEC with three-mode throttle profile for precise handling

ARRMA BLX120 4S Brushless ESC

The ARRMA BLX120 is a 120A waterproof electronic speed controller built for 3S or 4S LiPo power. It suits RC cars and trucks that need reliable throttle response and consistent power delivery during hard driving sessions.

Check battery connector and voltage limits

Your battery must use EC5 plugs and stay within 11.1V to 14.8V range. The ESC cuts off at 3.4V per cell and triggers over-voltage protection above 17.2V. Ensure your receiver accepts the 170mm lead and that the 12AWG wires reach your battery and motor terminals.

Fits tight chassis with built-in cooling

At 43mm long, 54.5mm wide and 34mm high, the unit slides into compact compartments while the integrated fan manages heat up to 125°C. The 6V 3A BEC powers steering servos and receivers directly, freeing you from a separate regulator. Three throttle profiles cover forward, reverse and brake modes for versatile driving styles.

Highlights

  • 120A waterproof ESC delivers consistent power control
  • 4S LiPo ready with 3.4V per cell low voltage cut-off
  • Built-in cooling fan reduces heat during intense driving
  • EC5 connectors and 12AWG wires ensure reliable high-current connections
  • 6V 3A BEC with three-mode throttle profile for precise handling

Specifications

TypeModels & Kits

Questions about this item

What comes in the box and do I need to buy a battery or motor separately?

The box includes the BLX120 brushless 4S ESC and a loop connector. A 3S or 4S LiPo battery and a compatible brushless motor must be purchased separately.

Should I choose the 3S or 4S LiPo option for this ESC?

The ESC supports both 3S at 11.1V and 4S at 14.8V LiPo packs. Select 4S for maximum speed or 3S for longer run times and lower stress on components.

What does the 120A rating mean when the ESC is installed in my RC vehicle?

The 120A continuous rating means the ESC can handle sustained high-current loads from a brushless motor. Thermal protection activates at 125°C and over-voltage protection triggers above 17.2V to protect the unit.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.