INSTRUCTIONS
CR105 MAGNETIC CONTRACTORS
CR106 MAGNETIC STARTERS
RATINGS
DESCRIPTION
The CR105 is an open or enclosed
magnetic contactor.
A CR106 full-voltage magnetic start-
er consists of one CR106 contactor and
one or more CR124 overload relays. The
overload relays provide motor protec-
tion against running and stalled rotor
overloads. However, separate motor
branch circuit over-current protection
against electrical faults should be sup-
plied in accordance with the National
Electrical Code.
FEATURES
q Horizontal
motion
straight-line
makes starter compact, easy to
Fig. 1. Typical CR106 starter with auxiliary
maintain.
contact added
q Strongbox coil.
q Newly designed overload relays in-
corporate dial for &1570 field ad-
justment of tripping current, so
4. Replace coil and re-assemble, re-
5. Mount starter on a sturdy verti-
that it is no longer necessary to
versing the procedure.
cal support.
change heaters to eliminate such
problems as nuisance tripping in
MAINTENANCE
Removal of Contacts
hot weather.
1. Keep magnet mating surfaces
1. Press against coil while pulling
q Straight through wiring.
free of any accumulated dirt or dust.
slightly on coil retainer (A) Fig. 1, and
q Large combination knock outs.
2. DO NOT OIL OR GREASE the
move retainer away from coil.
q Oversized power terminals will ac-
magnet mating surfaces.
2. Draw magnet assembly, including
commodate up to #8 wire.
3. The silver-cadmium oxide contacts
coil, molded cover and operating arm,
q Standard wire on open starters
need only be replaced when nearly all
from the starter.
meets JIC specifications.
tip material is gone and contact tip
3. Depress and slide movable con-
q Starter can be disassembled in a
support material is exposed.
tacts, spring and spring seat from the
matter of seconds.
4. The ultimate tripping current of
support.
installed relay heater can be adjusted
INSTALLATION
15% by using adjustment dial. Turn
dial clockwise to reduce ultimate trip-
Before connecting starter to power
ping current and counter-clockwise to
supply:
increase ultimate tripping current.
1. Remove all packing.
2. Clean magnet mating surfaces.
Removal of Coil
S. Install overload relay heater(a).
To prevent overloading the starter, do
1. Press against coil while pulling
not select heaters for a motor of a
slightly with fingers on side of coil
larger rating than given on the starter
retainer (A) Fig. 1, and move retainers
nameplate. Select heater(s) in accord-
away from coil.
ance with heater tables.
2. Pull one end of spring clip (B)
forward and slide out of slot.
4. Operate movable magnet and
3. Draw movable portion of magnet
operating arm by pressing on the name-
assembly and coil from the starter.
Fig. 2. CR124 overloed relay
plate to assure free movement.
