Question: Is a JST connector safe for 3S packs on small RC planes?
Answer: JST connectors, particularly the common JST RCY type, are generally rated for around 3A continuous current. For small RC planes using 3S LiPo packs, this can be borderline depending on your motor and ESC setup. If your plane’s current draw stays below 3A, a JST connector can be safe. However, many 3S setups draw higher current, which risks connector overheating and potential failure.
For safety and reliability, check your ESC’s maximum current and measure the typical current draw under load. If it regularly exceeds 3A, consider upgrading to connectors rated for higher current, such as XT30 or Deans (T-plug).
Step-by-step advice:
1. Identify your plane’s maximum current draw with a multimeter or ESC telemetry.
2. Compare this with the JST connector’s current rating (around 3A).
3. If your current is safely below this, JST is fine.
4. If not, switch to a higher-rated connector to avoid overheating.
5. Always ensure solid solder joints and secure insulation to prevent shorts.
Using the right connector improves safety, performance, and longevity of your RC plane’s power system.
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