12V switches: Rule of thumb for current draw?
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=141224
Printed Date: May 02, 2024 at 11:46 AM
Topic: 12V switches: Rule of thumb for current draw?
Posted By: bikemaniac
Subject: 12V switches: Rule of thumb for current draw?
Date Posted: April 30, 2016 at 4:17 PM
Hi,
I am about to buy some switches for automotive 12V use. However, switches are often rated in terms of switching current at 250 AC.
1. If lets say a switch is rated at 250 AC and the current at 10A, what will be the max current for 12 DC?
2. How much can the current be increased if I am not switching while current is flowing? In other words, if I turn a switch to ON, while no current is flowing, how much more current can be drawn when current is flowing afterwards?
Lucas
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1991 Toyota Corolla AE92 Liftback
Replies:
Posted By: icearrow6
Date Posted: April 30, 2016 at 7:52 PM
you want to use a home switch in a car?
10A also applies for the 12 volt application. I would advice to use a 30/40A relay to power anything above 10A.
2. WHat? this did not make any sense to me. V= I*R . so.. I = V/R for I to be "0" voltage must be 0.
if the switch is "on" but no current means there is infinite resistance. or rather not connected to anything. Im not sure i understand your question bud.
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