|
It is not the voltage rating that needs attention, it is the current (Amps). Anything will be fine for a voltage rating. To do the same work at 6 volts you need double the current that you need at 12 volts, and four times the current you need at 24 volts. Thanks to Ohms Law, an ohm of resistance is a bigger problem at 6 volts than it is at 12 or 24. These are the reasons 6V battery cables are so big.
The extra current needed at 6 volts drastically increases the likelihood that the cutoff switch will interfere with starting, and the possibility that the switch will melt. What you need for 6 volts is a switch that is huge and well built. Look for one for a fire truck or a big bus. Those will likely be 12v or 24v vehicles. When old car people who work on electrical systems a lot say you need a 6v switch, what they REALLY mean is that you need a really big switch that can handle double the current (or more) than a 12v car needs without overheating, melting, or adding enough resistance to cause slow cranking. If some vendor is offering a switch that is only rated for 6 volts, and it is smaller or cheaper than the others, that is absolutely not the one you need.
A good switch may be shocking for price.
| 
