Fuse and Momentary Switch question

[brexin]

I posted this on the new member forum and it quickly went to page 4 :/ Hoping someone in this section could lend a hand

I have everything ordered for my DNA30 box mod build EXCEPT the fuses and momentary switch. Here is what I'm dealing with, i hope someone can help.

Fuse: Not sure which to buy. Going to be running 2 LG18650 batteries. I've seen some people use board fuses and others use mini auto fuses. Which should i choose to maximize the protection of my system without increasing voltage drop? If pictures could be provided that would be a huge plus!!
(Edit: Found the post by Mamu regarding fuses HERE. Gonna get to reading )

Momentary Switch: Most use either the same buttons they use for the wattage adjust (the little guys) or the dome style bigger button. I'm currently vaping w/ the itazte mvp and really like the button it has, it doesn't require a lot of pressure, the button doesn't have a lot of movement and i don't have to push a button "inside" it's bezel in order to activate the switch. Do any of you know of a good switch that fits that criteria? Using the 1590b enclosure and I'd prefer to place the button on the front, not the side.

Thank you in advance for your assistance. If i was too vague with any of the above please let me know and I'll try to explain it a little better.

 

[Joey_cope]

I was really hoping to see some answers on this thread about the switch. Apparently, I ordered the wrong switch for my box-mod. I got a 5 amp switch but since I ordered it, I have learned that it will not be able to fire sub-ohm like I want it to :-( I cannot find a higher rated switch anywhere!! good luck bro, I hope you get your answers!!

 

[DaveP]

Sub ohm vaping gets into high amps quickly. 4 volts at .5 ohms generates an 8 amp current load at 32 amps. Switches fail faster at that level.

 

[brexin]

Does the fire switch connected to a dna30 see any of the big amperage though? Lots of folks use the same wattage adjust little momentary buttons for their fire button. I just don't want to wire it up and have their be a trick to it that I'm not seeing.

 

[TomGeorge]

I ordered this switch, 12 V 20 Amp

Amazon.com: 12V 20Amp Black Round Head SPST Momentary Car Push Button Switch 2 Pcs: Industrial & Scientific

and should have it tomorrow, but it looks like it should work for sub ohms

 

[opuscroakus]

Does the fire switch connected to a dna30 see any of the big amperage though? Lots of folks use the same wattage adjust little momentary buttons for their fire button. I just don't want to wire it up and have their be a trick to it that I'm not seeing.

No, with the DNA30 the board doesn't allow much current to flow to the switch. Very much like a mosfet.

 

[brexin]

No, with the DNA30 the board doesn't allow much current to flow to the switch. Very much like a mosfet.

Awesome, just ordered 6 of the lil guys from mouser along w/ some fuses. If i can't find a 12mm momentary that fits my picky side i'll just go with the little guy from now.

Thanks for the help!

 

[DaveP]

A high amp switch is only necessary when the switch is directly feeding battery voltage to the coil. Anytime you have electronics involved, the switch simply supplies a typical low voltage milliamp range signal to tell the electronics to turn on the MOSFET. The MOSFET supplies the voltage to the load, in this case that's an atomizer coil.

If it's a mech with no electronics, you need a high current switch.

 

[brexin]

A high amp switch is only necessary when the switch is directly feeding battery voltage to the coil. Anytime you have electronics involved, the switch simply supplies a typical low voltage milliamp range signal to tell the electronics to turn on the MOSFET. The MOSFET supplies the voltage to the load, in this case that's an atomizer coil.

If it's a mech with no electronics, you need a high current switch.

That's what i was thinking but wanted some reassurance. Thank you!!

For now i'm going to still use the small "wattage adjust" switch but i ordered a 3amp momentary anti-vandal in case i want to upgrade.