New Holland CX720 Repair Manual page 186

DISTRIBUTION SYSTEMS - ELECTRICAL POWER SYSTEM
ELECTRICAL POWER SYSTEM - General specification (A.30.A -
D.40.A.10)
FUSES
Fuses protect circuits with thin pieces of metal and wire which heat up and melt to open up the circuit when too
much current flows through them. The combine fuse panel (1) is located in the left rear corner of the cab, behind a
removable panel.
Fuses are used to protect the circuit from overload. This can occur in the event of a short circuit or by connecting
equipment which demands a current greater than the circuit is designed to carry.
There are several types of fuses, but they all consist of a metal conductor which is capable of carrying a limited current.
If the specified current is exceeded then the metal conductor will overheat, causing it to melt and break. This will in
turn cause an open circuit.
1
ZDA3100A
The rating of the fuse relates to the current that the fuse can carry continuously.
If a fuse blows, it must be replaced with a fuse of the correct rating, and if it blows again, then the cause must be
investigated.
A fuse may be tested by checking continuity across the fuse on the two exposed terminals (1).
2
50014700
SWITCHES
Switches are a vital part of an electric circuit, providing a method of controlling the circuit itself. One switch can
control a number of different circuits at the same time. This is achieved by having several separate connections
and/or multi-connector switches (several switch positions).
There are several types of switches, and they may incorporate a warning light.
2 4/7/2006
A.30.A / 6