'-···
I.
B.
35-240-1
TYPE DB-75
DE-ION AIR CIRCUIT BREAKER
y ears of service.
The l ubric ant is of a
special form which is used sparingly.
The
addition of oil will only promote the accu
mulation of dust and dirt.
STOR I HG
If circuit breakers are not to be installed
in their permanent locations at once, they
should be carefully inspected for loose or
damaged parts and then stored in a clean, dry
place in an upright position to avoid damage
to the circuit breaker parts.
A covering of
paper will prevent dust from settling on the
c ircuit breaker parts and is preferred to
packing or other materials which are apt to
absorb moisture.
FOR SA FETY REASONS, STORE
THE BREAKER IN THE OPEN POS IT ION.
PART II
INSTALLATION
Type "DB-75" circuit breakers are furnished
as complete unit assemblies and the installa
tion consists of:
(1) bolting them to the
suppotting frame work or structure; (2) con
n ecting the current carrying cables or bus
b ars; and (3) completing any secondary control
w iring that may be necessary.
CAUT ION:
DUR ING INSTALLAT ION, THE C IRCU IT
BREAKER SHOULD BE IN THE OPEN POS IT ION.
Be
sure to de-energize the load and control leads
to be connected, and also the section of the
switchboard where installation is being made.
Mounting dimensions and details of the
front enclosure cutouts are shown in Figure 1.
To prevent distortion of the breaker panel,
t he supporting structure should be checked
for alignment.
COHN ECT I ON S
Typical circuit breaker w1r1ng d iagrams
are shown in Figure 2.
The connecting cables
or bus b ars should h ave a dequ ate current
carrying capacity, or heat will be conducted
to the circuit breaker resulting in possible
excessive temperature rise. Connecting cables
or bus bars must be supported so that the cir
cuit breaker studs will not be subjected to
unnecessary stresses.
The circuit breaker studs and all connec
tions should be clean, smooth and free from
burrs to assume full contact area.
They
should be firmly clamped or bolted in place
to prevent excessive heating.
7
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