—
Figure 1 — reference diagram (representation only)
A
Coil
B
Overload relay
Heater slots
Magnetic
assembly
Adjustment
dial
A
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Figure 2 — reference diagram (representation only)
Coil retainer
Magnetic assembly
Adjustment dial
Overload relay
Fusible disconnect
switch
Fuse clip block
Spring clip
Coil retainer
OL relay heater slots
1
CAUTION
Before installing in a nuclear application,
determine that the product is intended
for such use.
WARNING
Disconnect power before installing
or servicing.
—
Ratings
Max.
voltage
Max.
continous
amp rating
AC volts
Max. HP for AC motors
Single-
phase
Poly-
phase
600
90
115
7
1
⁄
2
–
200
–
25
230
15
30
460/575
–
50
Description
An ABB 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.
The overload relay is provided with a
yellow trip indicator, located to the right
of the reset arm and visible when the
overload relay is tripped.
Features
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 1/0 AWG.
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.
Installation
Before connecting the starter:
1. Remove all packing.
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 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.
Coil removal
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)
and move retainers away from coil.
3. Withdraw magnet assembly, coil,
molded cover and movable arm
from device.
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INSTA LL ATION INSTRUC TIONS FOR NEM A SIZE 3
300/400-line combination magnetic starters
