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what size fuse?


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royclark 
Member - Posts: 1
Member spacespace
Joined: November 25, 2013
Location: United Kingdom
Posted: November 25, 2013 at 12:11 PM / IP Logged  

I am fitting a dash camera - max power consumption is 3.3w, from the same fuse I want to trigger a relay (40A 12vdc) to power another accessery.

What size fuse is required to protect this setup - 3.3w camera + trigger relay ?

oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: November 25, 2013 at 3:25 PM / IP Logged  
Use whatever wire gauge is required to power the devices.
The fuse for each wire should be rated no higher than the wire/cable (or relay) rating. If using one fuse for several wires, then no higher than the smallest wire.
Those fuses are to protect the distribution (wiring, relay etc; from flaming etc).
Like LEDs etc, fuses are unlikely to protect the camera.

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