Max.Hp
For AC Motors
Starter
Max
Current
Rating
Contactor
Max.
Current
Rating
AC
Volts
Single-
Phase
Poly-
Phase
Size 0
115
1
-
200
-
3
230
2
3
18 amp
(open
and
enclosed)
20 amp
(open)
18amp
(enclosed)
460—575
-
5
Size 1
115
2
-
200
-
7½
230
3
7½
27 amp
(open
and
enclosed)
30 amp
(open)
27amp
(enclosed)
460—575
-
10
Note:
For starters with one or more
normally closed contacts, perform steps
1 and 2 shown under Coil Replacement.
Withdraw spring clip (B—Figure 1) and
remove armature, coil, and magnet from
device. Remove return spring from center
of movable arm. Remove molded cover
and stationary contacts before lifting
movable arm from device.
Normally Closed Contacts
The contacts may be converted from
normally open to normally closed with no
additional parts. Perform steps 1 through
4 shown under
Coil Replacement
. Lift coil
and magnet from movable arm. Remove
return spring from center of movable
arm. Depress movable contact spring
and spring seat against movable contact
and rotate these parts 1/2 turn without
removing them from window. Remove
the stationary contacts. Install the
movable arm in the device. Install the
stationary contacts so that their silver
pads face the movable contact silver
pads. Reassemble the device. To change
contacts from normally closed to
normally open position, reverse the
above procedure.
Check For Welded Contacts In
Overload Relay
With power disconnected, disconnect
the control wiring from the relay
terminals. Place a bell set or resistance
measuring instrument across relay
terminals. Depress and release reset
arm to insure relay is reset
.
6.
Remove screws holding stationary
contacts in place and remove stationary
contacts.
7.
Reassemble device by reversing
procedure.
Combination
Magnetic Starters
CR307-CR308, CR310-CR311, CR387, CR390, CR407-CR408
CR410-CR415, CR487, CR490, CR492, CR494 Series
Motor branch circuit and control circuit
over- current protection should be
supplied in accordance with the
National
Electrical
Code.
CR305
contactors are suitable for use on a
circuit capable of delivering not more
than 5,000 RMS symmetrical amperes,
600 volts maximum when protected by
H, J, K1, K5, RK1, RK5 class fuses, or a
circuit breaker having an interrupting
rating not less than 5,000 RMS
symmetrical amperes.
Installation
Before connecting controller to power
supply:
1.
Remove all packing.
2.
Clean magnet mating surfaces of any
dirt or foreign matter.
3.
Select and install heaters in accordance
with heater table.
4.
Operate movable magnet and operating
arm by pressing on the nameplate to
assure free movement.
5.
Mount on a sturdy vertical support.
6.
Make the electrical connections.
7.
The starter overload relay may be reset
manually by depressing and releasing the
reset arm.
Coil Replacement
1.
Remove power from device.
2.
Press against coil while pulling up
slightly on coil retainers (A—Figure 1) and
move retainers away from coil.
3.
Withdraw magnet assembly, coil,
molded cover, and movable arm from
device.
4.
Withdraw spring clip (B—Figure 1) and
remove armature from movable arm.
5.
Remove coil from magnet.
6.
Replace coil.
7.
Reassemble device by reversing
procedure.
Contact Replacement
1.
Perform steps 1 through 5 under
Coil Replacement.
2.
Remove magnet from molded cover
and movable arm.
3.
Remove return spring from center
of movable arm.
4.
Remove molded cover from
movable arm.
5.
Depress and slide movable contact
and spring from movable arm.
Instructions For
NEMA size 0 & 1
Supersedes GEH-4793B
& GEH4796B
GEH-5193 Instruction
CAUTION:
Before installing in a nuclear
application, determine that the product is
intended for such use.
WARNING
:
Disconnect power
before Installing or servicing.
Description
General Electric 300/400-Line full-voltage
motor starters include a magnetic
contactor and a three-leg block overload
relay, providing motor protection against
running and stalled motor overloads. The
overload relay is provided with a yellow
trip indicator located to the right of the
reset arm, and is visible when the
overload relay is tripped
.
Ratings—600 V Maximum
Figure1.Typical 300/400-Line magnetic starter
Figure2
