what size fuse?

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=135372
Printed Date: May 14, 2025 at 10:58 AM

Topic: what size fuse?

Posted By: royclark
Subject: what size fuse?
Date Posted: November 25, 2013 at 12:11 PM

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 ?

Replies:

Posted By: oldspark
Date Posted: November 25, 2013 at 3:25 PM

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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