NEMA size 2
Before installing in a nuclear
application, determine that the product is
intended for such use.
before In-stalling or servicing.
A General Electric 300-Line full voltage
magnetic combination starter consists of a
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-fusible disconnect
switch provides a means of manually
disconnecting the motor from the line. The
circuit breaker or fusible disconnect switch
provides motor branch short-circuit
protection. The overload relay provides,
motor protection against running and
stalled motor overload.
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.
The overload relay is provided with a
yellow trip indicator which is located to
the right of the reset arm, and is visible
when the overload relay is tripped.
For AC Motors
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 #4 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
Before connecting the starter:
1. Remove all packing.
CR307-CR308, CR310-CR311, CR387, CR390, CR407-CR408
CR410-CR415, CR487, CR490, CR492, CR494 Series
2. 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
5. Mount the starter on a sturdy
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
7. Provide motor branch circuit
protection in accordance with the
National Electrical Code.
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
3. Withdraw magnet assembly, coil,
molded cover, and movable arm
4. Withdraw spring clip (B—Figure 1
or 2) and remove armature from
5. Remove coil from magnet.
6. Replace coil.
7. Reassemble device by reversing
Movable contacts can be inspected
and replaced in seconds—without
tools (Figure 3).