34
Overview
SPB Operation Manual
Fuses and circuit breakers
Fuses and circuit breakers are devices that are intend-
ed to protect against circuit overload. They do so by
melting or opening when the current in an electrical cir-
cuit becomes higher than it was designed for. Here are
a couple of examples of causes for over current:
• Short circuits (positive goes to negative without
resistance)
• Component malfunction (a coil that has to move
a sticky valve)
• Mechanical interference (a shovel handle stuck
through the oil cooler fan blade)
To maintain this safety device, simply replace a blown
fuse with the correct size and type fuse, and never by-
pass a fuse. A very good rule of thumb for fuses is this:
If it blows once, replace it. If it blows again, something
is very wrong. Find the cause of the problem, and repair
it before activating the circuit again.
Fuses in Control Panel
Figure 5
Example of fuses
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