GE CR307-CR308 Series

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Max.Hp

For AC Motors

Max.

Volt-

age

Max.

Continous

Amp

Rating

AC Volts

Single-

Phase

Poly-

Phase

600 45 115

200

230

460/575

7½

CAUTION: Before installing in a nuclear

application, determine that the product is

intended for such use.

DESCRIPTI

A ABB 300-Line full voltage magnetic c

mbination starter consists of a magnetic c

ontactor 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 prov

ides a means of manually

disconnecti

ng the motor from the line. The

circuit break er or fusible disconnect switch

provides m

otor branch short-circuit

protection.

The overload relay provides,

motor prote ction against running and

stalled mot

or overload.

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.

FEATURES

1. Strongbox coil.

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

position.

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

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.

Replace coil.

7. Reassemble device by reversing

procedure.

2. Clean magnet mating surfaces

of any dust or foreign matter.

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.

CONTACT REMOVAL

Movable contacts can be inspected

and replaced in seconds—without

tools (Figure 3).

WARN

ING: Disconnect

power before Installing or

servicing.

RATINGS

INSTALLATION

Before connecting the starter:

Remove all packing.

These instructions do not purport to cover all details or variations in equipment not to provi

de 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 ABB

Company.

GEH-4776 Installation Instructions for NEMA Size 2

300/400 -Line Combination Magnetic Starters

CR307-CR308, CR310-CR311, CR387, CR390, CR407-CR408

CR410-CR415, CR487, CR490, CR492, CR494 Series

Need help?

Do you have a question about the GE CR307-CR308 Series and is the answer not in the manual?

Summary

Features

Strongbox Coil

Features a strongbox coil design for durability.

Overload Relay Adjustment

Adjustable trip current ±10% without changing heaters.

Overload Trip Indicator

Indicates when the overload relay has tripped.

Straight Through Wiring

Features straight through wiring for ease of installation.

Oversized Power Terminals

Terminals accommodate up to #4 wire for flexible connections.

Easy Disassembly and Inspection

Starter can be disassembled for inspection in seconds.

Interlocked Disconnect Switch

Prevents opening enclosure door when handle is in OFF position.

Installation

Remove Packaging

Remove all packing materials before connecting the starter.

Clean Magnet Surfaces

Clean magnet mating surfaces of dust or foreign matter.

Select Heaters

Select heaters according to the accompanying heater table.

Test Magnet Movement

Operate magnet and arm to ensure free movement.

Mount the Starter

Mount the starter on a sturdy vertical support.

Manual Overload Relay Reset

Reset overload relay manually by depressing the reset arm.

Provide Branch Circuit Protection

Ensure motor branch circuit protection per National Electrical Code.

Coil Removal

Disconnect Power

Always remove power from the device before removing the coil.

Release Coil Retainers

Press against coil and pull up coil retainers to release.

Withdraw Assembly Components

Remove magnet assembly, coil, and movable arm.

Remove Armature Spring Clip

Remove spring clip and armature from movable arm.

Remove Coil from Magnet

Remove the coil from the magnet assembly.

Replace Coil

Replace the coil following the reverse procedure.

Contact Removal

Inspect and Replace Contacts

Inspect and replace movable contacts quickly without tools.

Maintenance and Troubleshooting

Simple Maintenance Procedures

Ensure dependable service with basic preventive maintenance tasks.

Check for Welded Contacts

Check for welded relay contacts using an audible click or continuity test.

Contact Care

Do not file contacts; replace when silver tip is nearly gone.

Heater Adjustment

Adjust ultimate tripping current ±10% using the adjustment dial.

This document describes the GEH-4776 Installation Instructions for NEMA Size 2 300/400-Line Combination Magnetic Starters, covering CR307-CR308, CR310-CR311, CR387, CR390, CR407-CR408, CR410-CR415, CR487, CR490, CR492, and CR494 Series.

Function Description

The ABB 300-Line full voltage magnetic combination starter integrates a magnetic contactor, a three-leg block overload relay, and a manually operated circuit breaker or disconnect switch. The disconnect switch, which can be either fusible or non-fusible, provides a manual means of disconnecting the motor from the line. Both the circuit breaker and fusible disconnect switch offer motor branch short-circuit protection. The overload relay provides crucial motor protection against both running and stalled motor overload conditions.

Important Technical Specifications

Voltage Ratings: The device supports a maximum voltage of 600V.
Continuous Amp Rating: It has a continuous amp rating of 45A.
AC Volts: Operates at 115V, 200V, 230V, and 460/575V.
Max Horsepower for AC Motors:
- Single-Phase: 3 HP (115V), 7.5 HP (230V).
- Poly-Phase: 10 HP (200V), 15 HP (230V), 25 HP (460/575V).
Coil Data (for three-pole device):
- 60Hz:
  - 115V: 002
  - 200/208V: 023
  - 230V: 003
  - 460V: 004
  - 575V: 005
  - 600V: 006
- 50Hz:
  - 110V: 007
  - 220V: 008
  - 380V: 064
  - 440V: 009
  - 550V: 010
  - 600V: 011
- Note: Use 022 for 120V, 60 Hertz/110V, 50Hertz coil.
Wiring: Designed for straight-through wiring.
Power Terminals: Oversized to accommodate up to #4 wire.

Usage Features

Overload Relay Adjustment: The overload relay includes a dial for ±10% field adjustment of the tripping current. This feature eliminates the need to change heaters to address issues like nuisance tripping in hot weather.
Overload Trip Indicator: A yellow trip indicator, located to the right of the reset arm, is visible when the overload relay has tripped.
Manual Reset: The overload relay can be manually reset by depressing and releasing the reset arm.
Optional Normally Open Contact: Overload relays with an optional normally open contact are electrically isolated from the normally closed contact.
Mechanical Interlock: The circuit breaker or disconnect switch is mechanically interlocked with the enclosure door, preventing the door from opening until the handle is moved to the OFF position.
Strongbox Coil: The encapsulated coil is impervious to moisture, dirt, and oil, and resists mechanical damage and failure due to high humidity.

Maintenance Features

Disassembly and Inspection: The starter can be disassembled and inspected in a matter of seconds.
Coil Removal: No tools are required to remove the coil. The procedure involves removing power, pressing against the coil while pulling up slightly on coil retainers, moving retainers away, withdrawing the magnet assembly, coil, molded cover, and movable arm, then withdrawing the spring clip and removing the armature and coil. Reassembly is the reverse process.
Contact Removal: Movable contacts can be inspected and replaced in seconds without tools.
Welded Contact Check (Overload Relay): This feature allows maintenance personnel to check for welded relay contacts by depressing the white operator on top of the overload relay contact housing. An audible "click" indicates normal operation when the relay is in the reset condition. A continuity check can also be performed by disconnecting control wiring and using a bell set or resistance measuring instrument across the relay terminals. This provides positive assurance that contacts have not welded due to short circuits in the control wiring.
Simple Maintenance: 300/400-Line starters and contactors require virtually no corrective maintenance.
- Always remove power before maintenance.
- Keep magnet mating surfaces free of dirt or dust.
- Do not oil or grease magnet mating surfaces.
- Contacts should only be replaced when nearly all the silver tip is gone; do not file or dress contacts, as this reduces contactor or starter life.
- The ultimate tripping current of the installed relay heater can be adjusted ±10% using the adjustment dial.

Installation Notes

Before connecting the starter, remove all packing.
Clean magnet mating surfaces of any dust or foreign matter.
Select heaters in accordance with the heater table provided with each device.
Operate the movable magnet and operating arm by pressing on the nameplate to ensure free movement.
Mount the starter on a sturdy vertical support.
Ensure motor branch circuit protection is in accordance with the National Electrical Code.

Important Safety Information

CAUTION: Before installing in a nuclear application, determine that the product is intended for such use.
WARNING: Disconnect power before installing or servicing.