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AUTO-LITE
ELECTRICAL
EQUIPMENT
RELAYS AND REGULATORS
CB, CBA and RA CIRCUIT BREAKERS'
DESCRIPTION
The functian of a circuit
the voltage builds up at the generator terminal
AND FUNCTION
breaker in automotive elec-
and in the shunt coil. As soon as the voltage
trical equipment is to automatically open and
reaches the value for which the circuit breaker
close the circuit between the generator and the
is calibrated, there is sufficient magnetism created
storage battery.
by the shunt coil to pull down the armature, clos-
,
It consists of" on electromagnet and a set of
ing the contacts, automatically connecting the
contacts. The electromagnet has two windings;
generator to the battery. With the contacts thus
the shunt coil connected across the generator
closed, the current in the series coil is flowing
a voltmet~r, and the other a series coil con-
from the generator to the battery or in the same
in:sllrl~~ with the generator output like
direction as the current in the shunt coil, so that
an ammeter. (See Figure 42)
the pull on the armature is increased by magnetism of the series coil.
As the engine is stopping and the generator
loses speed, the voltage falls. As soon as the
generator voltage drops below the battery terminal voltage, the current flows fram 'he battery
to the generator, reversing the direction of current in the series coil so that the magnetism
created by the series coil is opposed to the magnetism created by the shunt coil, reducing the
magnetic pull on the armature and the spring
.en .the generator is charging the battery
~pens
current is flowing through both windings in
the contacts, disconnecting the generator
f~om the battery.
,.,.,."." ... ~,sa'11e direction. When the current flows from
battery to the generator, the current is flow-
'
MAINTENANCE PROCEDURE
through the shunt coil in one direction and
1. Contacts-The contacts can be cleaned by
through the series coil in the opposite direction.
filing, parallel with the length of the armature,
The circuit breaker contacts consist of one
with a very fine file (ST-290 recommended) so
',m.c)vable cantact mounted on an armature oper-
that they are free from pits or burning. After
by the electro magnet, while the other is a
filing the contacts should be cleaned with refined
'?1\f,'~tc"ic>nclrv contact. These contacts are held open
carbon tetrachloride to remove any dirt or
by an" armature
spring.
The,s~.qy,en.ce-of operation
grease. Pull a piece of clean linen tape between
of the circuit br,.ak-
the contacts to remove any residue.
" . "~;~:i'~'!
ar ur;1it is,.(;i$follows:
2. Adjustments
a. Armature air gap .010 to .030 inches
:",V{h.,n the aelner·ai,,. is not rvnning, tne,.:~c)Ac'
the gener(ltor' ... :.:'
This gap is measured with the contacts closed
"