Switching Unit - Belarus 3522.5 Operator's Manual

2.18 Switching unit

The switching unit 3 (figure 2.18.1) is intended for current supply, its distribution be-
tween tractor power consumers and for protection of electrical lines against short-circuit
and current load excess, it is a central distributing unit, to which wiring harnesses of differ-
ent systems of tractor electrical equipment are connected by means of straps. Using of the
switching unit ensures convenience of diagnostics and repair of tractor electrical equip-
ment during its operation.
Your tractor may be equipped with two types of switching units – БКА-7.3722 or
БК-1, which are interchangeable.
Place of the switching unit installation is in the cab, on a metal beam of plastic shell
fixation, between the dashboard 4 and a windscreen.
To access relay and fuses of the unit 3 it is needed to unscrew two quick detach-
able screws 1, then remove a plastic cover 2. The unit also has a plastic cover, intended
for dust protection.
The unit consists of thirty cutout fuses 1 (figure 2.18.2) (FU1-FU30) and nineteen
electromagnetic relays 4 (K1-K19), commutating current supply for consumers, a set of
spare fuses 5. Signal led lamps of red color 2, located on the front board near each fuse,
are intended for indication of a corresponding fuse blow out. A signal led lamp of green
color 3 indicates turning on of the switching unit.
1 – screw; 2 – cover; 3 – switching unit; 4 – dashboard.
Figure 2.18.1 – Switching unit installation
а) БКА-7.3722
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