# Where to place the circuit breaker?
**URL:** https://foil.zone/t/where-to-place-the-circuit-breaker/5324
**Category:** Electronics (ESC, remote, batteries)
**Created:** [August 16, 2019, 5:45pm UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324 "2019-08-16T17:45:20Z")
**Posts on this page:** 17
**Page:** 1
### Author:  [@RamsUK](https://foil.zone/u/RamsUK)
#### Post date: [August 16, 2019, 5:45pm UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/1 "2019-08-16T17:45:20Z")
About to order my electrics and will be using the following
ARC200 Going to mount it on a metal plate with an air gap underneath.
120 Marine Circuit Breaker
2 x Turnigy 6S 20000 mah 22.2v lipos (12s)
No water cooling, my mast doesn’t allow for it and I don;t want the faff and complication
I am using 6000KW Flying rodeo prototype motor
I will also use one of these 6V 1200mah Ni-Mh batteries to power the receiver
The question I have is where do I place the circuit breaker within the circuit? And can I use this as an emergency kill switch by simply glueing a powerful magnet to it or will that kind of sudden break damage the esc. As you can tell my electronic knowledge is fairly limited.
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### Author:  [@theone](https://foil.zone/u/theone)
#### Post date: [August 16, 2019, 11:25pm UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/2 "2019-08-16T23:25:52Z")
See for one option 🙂
> **[Flying Nemo from North Queensland Australia](https://foil.zone/t/flying-nemo-from-north-queensland-australia/1697/109)**
>
> Hi Alex, In my picture above, below and left of the circuit breaker is a terminal block for the negative connection. This made it easier to connect the dual cables on the flier ESC with eye terminals. Below is a very rough sketch of how I have it...
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### Author:  [@SoEFoil](https://foil.zone/u/SoEFoil)
#### Post date: [August 16, 2019, 11:30pm UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/3 "2019-08-16T23:30:22Z")
Wiring diagrams:
@pacificmeister’s: [Electrical Wiring Diagram - Google Slides](https://docs.google.com/presentation/d/1R-xGHFiE4-W5xvgtcqZwK6GiXNNgidkO9K7Q_OYXZUo/edit?usp=sharing)
found here:
[Pacificmeister Build Info and CAD Sources - #526 by pacificmeister - Builds - FOIL.zone](https://efoil.builders/t/pacificmeister-build-info-and-cad-sources/21/526?u=soefoil)
@Vincentbraillard’s where the reed switch controls the BMS:
[Safety with eFoils - #24 by Vincentbraillard - Safety - FOIL.zone](https://efoil.builders/t/safety-with-efoils/37/24?u=soefoil)
Two years after the first wiring diagrams were posted, what have we learned ? A circuit breaker in the battery box, a leash activated Reed Switch in the ESC box : would we do that differently today ? Maybe we should talk about that in “Safety with eFoil” ?
- a main fuse between battery and ESC ?
- activate current limitation if ESC allows it ?
- a 30 or 40°C probe on the ESC to trigger the water pump ?
- anti-spark FET based switches and where to place them ?
200A here [FatBoy AntiSpark Switches – 3DServisas](https://shop.3dservisas.eu/collections/fatboy-antispark-switches)
100+A there: [Vedder Anti-Spark switches for sale (from 18€) - #157 by agtree - New Items For Sale - Electric Skateboard Builders Forum | Learn How to Build your own E-board](https://www.electric-skateboard.builders/t/vedder-anti-spark-switches-for-sale-from-18/31847/157)
- your feature … show us your innovative wiring diagram !
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### Author:  [@RamsUK](https://foil.zone/u/RamsUK)
#### Post date: [August 17, 2019, 6:39am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/4 "2019-08-17T06:39:14Z")
Thanks for all the info
Does anyone know if the ARC 200 has any built in safety functions like temperature cut off or surge protection
Also should I add some kind of temperature alarm?
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [August 17, 2019, 7:58am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/5 "2019-08-17T07:58:13Z")
The arc200 has both temperature and current protection. I don’t think that there is any overvoltage protection.
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### Author:  [@RamsUK](https://foil.zone/u/RamsUK)
#### Post date: [August 17, 2019, 8:35am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/6 "2019-08-17T08:35:50Z")
Thanks @Jezza did you use a circuit breaker with your ARC 200? And do you think I’m going to be ok without water cooling with the set up above assuming I mount it on a metal plate
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [August 17, 2019, 8:58am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/7 "2019-08-17T08:58:44Z")
I have never bothered with a circuit breaker.
On one setup I used a 200x60x10mm aluminium slab as a heatsink without any watercooling. I then set the ESC to cut off at 85°C to avoid any damage.
On the other I run watercooling which keeps the ESC below 60°C
Both systems are properly set up with the RC failsafe though.
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### Author:  [@RamsUK](https://foil.zone/u/RamsUK)
#### Post date: [August 17, 2019, 9:44am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/8 "2019-08-17T09:44:48Z")
Thanks @Jezza, excuse my ignorance but what do you mean when you say an RC failsafe? Is that a separate unit?
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [August 17, 2019, 10:58am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/9 "2019-08-17T10:58:53Z")
When the receiver loses signal, then it tells the arc200 not to drive the motor. So if you had throttle and the motor is spinning. If you then suddenly switched off the remote then the motor would stop.
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### Author:  [@RamsUK](https://foil.zone/u/RamsUK)
#### Post date: [August 17, 2019, 6:41pm UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/10 "2019-08-17T18:41:01Z")
Thanks for the advice @Jezza which RC failsafe do you use? I have had a look online an there seems to be a lot of choice.
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [August 17, 2019, 6:59pm UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/11 "2019-08-17T18:59:53Z")
The failsafe is built into the receiver. I use the Maytech waterproof remote.
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### Author:  [@RamsUK](https://foil.zone/u/RamsUK)
#### Post date: [September 18, 2019, 7:09am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/12 "2019-09-18T07:09:10Z")
Build has stalled a bit as can’t get the hatch 100% waterproof. It’s about 95% at the moment
Did you leave the o ring gasket in that came with the hatch?
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [September 18, 2019, 7:28am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/13 "2019-09-18T07:28:32Z")
Yeah, I left that in. Otherwise the other gasket will just fall into that area.
Have you figured out where the leak is coming from?
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### Author:  [@RamsUK](https://foil.zone/u/RamsUK)
#### Post date: [September 18, 2019, 8:07am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/14 "2019-09-18T08:07:30Z")
No it seems to be coming from multiple locations.
To be honest it’s not bad but even a small amount of water is going to cause big problems
Think I am just going to have to go at it with more sealant
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [September 18, 2019, 9:09am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/15 "2019-09-18T09:09:53Z")
Is it coming through the seal underneath the hatch, or the seal with the lid?
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### Author:  [@RamsUK](https://foil.zone/u/RamsUK)
#### Post date: [September 18, 2019, 9:17am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/16 "2019-09-18T09:17:01Z")
Bit of both I think which is annoying.
To be honest I still want to persevere with the hatch if I can
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [September 18, 2019, 10:03am UTC](https://foil.zone/t/where-to-place-the-circuit-breaker/5324/17 "2019-09-18T10:03:23Z")
The hatch I did seals perfectly so it is possible. I used a lot of marine silicone under the hatch and that seemed to work there. You clearly have a gap in the hatch seal near no.5 which needs to be closed. I used CA glue for this and then pushed the join together till it dried.
I don’t know how flat the hatch has gone down on your board though so that could be an issue too.
How long and how deep did you submerge the board before it leaked?