Circuit Breaker And Fuse Ratings; Sharing A Breaker - Raymarine VCM100 Installation Instructions Manual

3.11 Circuit breaker and fuse ratings

Battery isolator switch, thermal breaker, and fuse ratings.
All power connections between the VCM100 and its power source
must be protected by a thermal circuit breaker or fuse, fitted close
to the power connection. The connection from the output of the
VCM100 to the digital radar does not require a fuse or circuit breaker.
If you do not have a thermal circuit breaker or fuse in your power
circuit (fitted to the DC distribution panel, for example), you MUST fit
an in-line breaker or fuse to the positive wire of the power cable.
The following table provides suitable ratings for battery isolator
switches, circuit breakers, and fuses.
Power
supply Device
12 volt Isolator switch
Thermal breaker
Fuse
24 volt Isolator switch
Thermal breaker
Fuse
28
12 kW
4 kW scanner scanner
30 amps 30 amps
(minimum rating) (minimum rating)
15 amps 15 amps
20 amps 20 amps
15 amps 15 amps
(minimum rating) (minimum rating)
8 amps 8 amps
10 amps 10 amps

3.12 Sharing a breaker

Where more than 1 piece of equipment shares a breaker you must
provide protection for the individual circuits. E.g. by connecting an
in-line fuse for each power circuit.
+VE bar
Where possible, connect individual items of
equipment to individual circuit breakers.
Where this not possible, use individual in-line
fuses to provide the necessary protection.
Circuit breaker
HD and SuperHD Digital Open Array Installation instructions
-VE bar
Fuse Fuse