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This forum is super awesome! I have been creeping around it for almost 6 months and decided to become a part of it to ask a question I had.

So, I am trying to build a on and off switch on my electric scooter. I need the switch to be able to power on and off up to 60VDC and 120Amp and I am a starving student so I am hoping its under $20 ( that's about 40 - 80 ramen meals depending on where you source them :D )

Thanks in advance !

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closed as too broad by PeterJ, Daniel Grillo, Nick Alexeev Feb 25 '16 at 23:38

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ I'll give you 6 ramen if you do some preliminary research. \$\endgroup\$ – Nick Alexeev Feb 18 '16 at 3:23
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    \$\begingroup\$ This is a shopping question and is off-topic here. \$\endgroup\$ – uint128_t Feb 18 '16 at 3:32
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    \$\begingroup\$ @ElectronS, well, that doesn't sound good. So that idea is probably a loser. \$\endgroup\$ – mkeith Feb 20 '16 at 17:25
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    \$\begingroup\$ @ElectronS, after searching a little, I think continuous duty solenoids exist, but I don't think they are likely to be found in a scrap pile. \$\endgroup\$ – mkeith Feb 20 '16 at 17:35
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    \$\begingroup\$ @mkeith , bravo +1 for the search ! they do exist and companies like albrightinternational have been making them along with short duty . but offcourse for a starter motor every manufacturer is going to choose the low duty due to small wieght and lower cost. regards :) \$\endgroup\$ – ElectronS Feb 20 '16 at 17:54
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Something I would be cautious about is the inductive nature of any electric engine. Switching off a live circuit with inductive components will result in voltage spikes, and therefore electric arcs that can easily kill any switch and possibly even damage other components in the circuit. I recommend you watch this video for further information on that topic.

Before trying to install a switch, I recommend trying to reverse engineer the power electronics in your scooter to make sure there are adequate protections against this, and if not, adding a flyback diode to the engine should probably be enough to protect the circuit. I assume you are an EE student? It'll probably be a good exercise to try to figure out how your scooter works, just make sure to be safe and disconnect the battery before doing anything.

Now, as for selecting an appropriate switch, you can search suppliers like digikey and do a parametric search for the appropriate voltage and current ratings. However, depending where you live, shipping costs will probably be very prohibitive and it'll probably be much cheaper if you just search for local electronics suppliers and personally ask them if they have switches that meet your criteria. You can always use ebay, but be on the lookout for dodgy parts.

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