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Old 04-04-2018, 06:08 PM   #1
Walt Thyng
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Default JST connector amp rating

How many amps can a JST connector carry? Can I use one to install a 5 amp max external BEC?
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Old 04-04-2018, 06:26 PM   #2
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According to the specs on Wikipedia, they are rated for 3 amps.

https://en.wikipedia.org/wiki/JST_connector

I know many people use them at much higher current levels, but at some point they will start getting hot.

Since your average current would be well below 3 amps it should work okay, but if you had something that pulled a steady 5 amps, things might start getting warm.

I use XT30's on small stuff, I know it is 4 times larger but it is still small enough for me. Plus it can carry 30 amps, probably a short term rating, I would not use it for my home 30 amp dryer circuit.

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Old 04-04-2018, 07:01 PM   #3
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Thanks Dave that just what I needed to know. My BEC will be driving a RX and 4 standard SX. When I test the set-up I'll give the SX a workout and then check the JST for heat.
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Old 04-04-2018, 10:34 PM   #4
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You won't overheat it just powering the Rx and servos.
Many small lipo's come with a JST, if they are used for powering a ESC and motor, then things could get hot. A relatively small 120 watt motor would pull around 10 amps on a 2 cell battery.

Different equipment, but one time I had my 120vac electric chainsaw's plug, absolutely weld itself into the female socket of my heavy duty extension cord.
I had to cut both cords and put new plugs on them.
Everything was acting normal until I tried to unplug the cord.
120 vac cord connectors are only rated for 15 amps.
Chainsaw pulled about 13 amps, but it was enough to weld the parts together.

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Old 04-05-2018, 10:35 AM   #5
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I'd call about 10 amps the limit. I had about 140 watts on a slow stick with my first rc setup. I used a 3 cell eflight Lipo from a helicopter with a jst connector on it.

slow stock prop reversal. it flies! easily! 543 watt dual motor bipe slow stick. push-me-pull-you. 242 watt 3 channel slow stick. 365 watt mini ultra stick. 415 watt mini contender. 810 watt ultra stick .25e. 220 watt alpha 450 sport (retired).
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