Max.Hp
For AC Motors
Max.
Volt-
age
Max.
Contin
ous
Amp
Rating
AC Volts
Single-
Phase
Poly-
Phase
600 135 115
200
230
460/575
-
-
-
-
-
40
50
100
Before installing in a nuclear
application, determine that the product is
intended for such use.
Disconnect power
before Installing or servicing.
A General Electric 300/400-
magnetic combination sta
magnetic contactor with a three leg block
overload relay and a manually operated
circuit breaker or disconnect switch. The
disconnect switch may either be fusible or
non-fusible. The non-
switch provides a means of manu
disconnecting the motor from the line. The
circuit breaker or fusible disconnect switch
provides motor branch short-
protection. The overload relay provides,
motor protection against running and
The overload relay is provided with a
yellow trip indicator which is located to
the right of the reset ar
when the overload relay is tripped.
1. Strongbox coil.
2. Overload relay, incorporates a dial
for ±10% field adjustment of tripping
current, so that it is no longer
necessary to change heaters to
eliminate such problems as nuisance
tripping in hot weather.
3. Overload trip indicator.
4. Straight through wiring.
5. Oversized power terminals will
accommodate up to 3/0 wire.
6.Starter can be disassembled and
inspected in a matter of seconds.
7. Circuit breaker or disconnect switch
is mechanically interlocked with the
enclosure door to prevent opening the
door until the handle is moved to the
OFF position.
The encapsulated coil is impervious
to moisture, dirt, and oil. It resists
mechanical damage and failure due
to high humidity. No tools are
required to remove coil.
1. Remove power from device.
2. Press against coil while pulling up
slightly on coil retainers (A—Figure 1
or 2) 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
or 2) and remove armature from
movable arm.
5. Remove coil from magnet.
6. Replace coil.
7. Reassemble device by reversing
Clean magnet mating surfaces of any
dust or foreign matter.
3. Select heaters in accordance with
heater table, which accompanies each
device.
4. Operate movable magnet and
operating arm by pressing on the
nameplate to assure free movement.
5. Mount the starter on a sturdy vertical
support.
6. The overload relay may be reset
manually by depressing and releasing
the reset arm. Overload relays with an
optional normally open contact are
electrically isolated from the normally
closed contact.
7.
Provide motor branch circuit
protection in accordance with the
National Electrical Code.
Movable contacts can be inspected
and replaced in seconds—without
tools (Figure 3).
Before connecting the starter:
1. Remove all packing.
These instructions do not purport to cover all details or variations in equipment not to provide for every possible contingency to
be met in connection with installation, operation or maintenance. Should further information be desired or should particular
problems arise which are not covered sufficiently for the purchaser’s purpose, the matter should be referred to the GE Company
Magnetic Starters
CR307-CR308, CR310-CR311, CR387, CR390, CR407-CR408
CR410-CR415, CR487, CR490, CR492, CR494 Series
(2 pages)
(14 pages)
(4 pages)
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