ABB 300 Series User manual

—
Figure 1 — reference diagram (representation only)
A
Coil
B
Overload relay
Heater slots
Magnet
assembly
Adjustment
dial
C
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Figure 2 — reference diagram (representation only)
Magnet
assembly
Overload relay
Circuit breaker
or molded
case switch
Pilot devices
Accessories
Lifting brackets
(not shown)
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.
continuous
amp rating AC volts
Max. HP for
AC motors
Poly-phase
   
 
 
Description

motor starter consists of a magnetic

relay and a manually operated circuit
breaker or disconnect switch. The
disconnect switch may either be fusible

switch provides a means of manually
disconnecting the motor from the line.
The circuit breaker or fusible disconnect

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.
 
5. Oversized power terminals will
accommodate up to 2 runs of
500 MCM 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.
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.
 
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. Unscrew one end of the retainer (B —
figure 1) and slide it out of the slot.
3. Remove movable magnet assembly.
 
figure 1) . Press against coil and pull up
and out on coil retainers (A — figure 1).
—
INSTALLATION INSTRUCTIONS FOR NEMA SIZE 6
300/400-line magnetic motor starters

2
5. Remove coil from magnet.
6. Replace coil.
7. Reassemble device by reversing
procedure.
Contact removal
Movable contacts can be inspected
and replaced in seconds —without
tools (Figure 3).
1. Perform steps 1 through 5 under
coil replacement.
2. Remove complete magnet assembly
by pulling entire assembly from the
contactor assembly.
3. With the magnet assembly resting on
its side, remove the movable arm by
sliding it out the back of the assembly.

and slide movable contact from
movable arm.
5. Remove screws holding stationary
contact in place and remove stationary
contact.
6. Reassemble by reversing the above
procedure. When reassembling, note
that the cover will fit only one way.
Magnet and movable arm will fit either
way but will be quieter if reassembled
the same way they were taken apart.
NOTE: Do not attempt to remove or
replace arc traps in arc chute cover.
When reassembling, note that the arc
chute cover will only fit one way and is

Check for welded contacts
in overload relay
This feature permits maintenance
personnel to check for welded relay
contacts by simply depressing the white
operator located at the top of the overload
relay contact housing. When the relay is in
the reset condition, an audible “click” will
be heard when the operator is depressed,
indicating that the contacts are operating
normally. A continuity check can also be
made by disconnecting the control wiring
from the terminals of the relay and placing
a bell set or a resistance measuring
instrument in the circuit. Connecting
either of these across the relay terminals
will indicate the relay contact is closed

depressed, opening the circuit. The
exclusive manual contact operation check
gives positive assurance that contacts
have not welded due to short circuits in
the control wiring.
Simple maintenance

require virtually no corrective
maintenance. Preventive maintenance
will assure many years of dependable

1. Always remove power from device
before performing any maintenance.
2. Keep magnet mating surfaces free
of accumulated dirt or dust.
3. DO NOT OIL OR GREASE the magnet
mating surfaces.

maximum life. They need only be
replaced when nearly all the silver tip
is gone and the contact tip support is
exposed. DO NOT FILE the contacts.
Filing or otherwise dressing the
contacts only results in lost tip material
and reduces contactor or starter life.
5. The ultimate tripping current of the
installed relay heater can be adjusted
±10% by using adjustment dial.
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Replacement coils


Frequency 115–120 V 200 –208 V 230–240 V – 460 –480 V 575–600 V
     
Frequency 110 V – 220 V 380 V 440 V 550 V
     
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Accessory kits
 
 
 
Additional NO auxiliary contact for all forms 
Additional NC auxiliary contact for all forms 
Surge suppressor 
 
—
Figure 3 — reference diagram (representation only)
Stationary
contact
screws
Stationary
contacts
Movable
contacts
Movable arm
return spring
(not shown)
Spring seat
Spring

3
1SQC912122M0201 July 2021
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We reserve the right to make technical
changes or modify the contents of this
document without prior notice. With regard
to purchase orders, the agreed particulars
shall prevail. ABB Inc. does not accept any
responsibility whatsoever for potential
errors or possible lack of information in
this document.
We reserve all rights in this document
and in the subject matter and illustrations
contained therein. Any reproduction or
utilization of its contents – in whole or in
parts – is forbidden without prior written
consent of ABB Inc. Copyright© 2021 ABB.
All rights reserved.
—
USA
ABB Inc.
305 Gregson Drive
Cary, NC 27511
electrification.us.abb.com
—
Principal renewal parts
Ref. no. Description Catalog number Quantity required
Coil retainer assembly  
   
   
   
   
Return spring for movable arm  
Molded movable arm with return spring  
Armature and frame (magnet) with retainer  
Operating coil  
 Retainer for armature  
*** Insert numbers for particular coil rating required. See coil table above.
These instructions do not purport to cover all details or variations in equipment nor
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 that are not covered sufficiently for the purchaser’s purpose, the matter
should be referred to ABB Inc.
—

8
10
91
2, 3

5
7
6