The battery master switch is a simple but powerful accessory.
It has two main functions:
1) Battery isolation – Used to link or disconnect batteries.
2) Equipment isolation – Used as a main power switch to accessories.
Battery isolation can be done with 3 types of isolators. a) Master Switch. b) Heavy
duty solenoid / relay. c) Smart Isolator also known as a VSR (Voltage Sensing Relay)
or Electronic Isolator.
Note: Diode Isolators are not recommended as they have a substantial voltage drop
and batteries do not fully charge.
Equipment isolation is an important safety issue with high current accessories that
are not easily fused like winches and inverters. These accessories are not used all
the time and have heavy high current cables connected to them which if shorted out
in an accident or simply rub through can cause serious damage or even a fire.
The master switch can be used to prevent battery drain from electronics when a vehicle
is stored or shut off battery power in an emergency. It can also prevent vehicle
theft and damage from vandals operating your winch from outside the vehicle on vehicles
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