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1

40752-195 (1)

 

Effective 

2

/201

1

Installation Instructions for Bul. 140

U

 N-Frame Circuit Breakers and Molded 

Case Switches

DO NOT ATTEMPT TO INSTALL OR PERFORM MAIN-

TENANCE ON EQUIPMENT WHILE IT IS ENERGIZED.  

DEATH, SEVERE PERSONAL INJURY, OR SUBSTAN-

TIAL PROPERTY DAMAGE CAN RESULT FROM 

CONTACT WITH ENERGIZED EQUIPMENT.  ALWAYS 

VERIFY THAT NO VOLTAGE IS PRESENT BEFORE 

PROCEEDING WITH THE TASK, AND ALWAYS FOL-

LOW GENERALLY ACCEPTED SAFETY PROCE-

DURES.

ALLEN-BRADLEY 

IS NOT LIABLE FOR THE MIS

APPLI-

 

CATION 

OR MISINSTALLATION OF ITS PRODUCTS.

The user is cautioned to observe all recommendations, 

warnings and cautions relating to the safety of personnel 

and equipment as well as general and local health and 

safety laws, codes and procedures.

The recommendations and information contained herein 

are based on Rockwell experience and judgement, but 

should not be considered to be all-inclusive or covering 

every application or circumstance which may arise.  If any 

questions arise, contact Rockwell for further information 

or instructions.

1.  INTRODUCTION

The N-Frame Circuit Breaker (Figure 1-1) are 690VAC 

maximum rated devices, 600V for UL applications, and 

have integral trip units.  Available current ratings are up 

to 1600 Amp, 1200 for UL applications.  I N-Frame Circuit 

Breakers and molded case switches are listed in ac-

cordance with Underwriters Laboratories, Inc. Standard 

UL-489 and satisfy the requirements of the International 

Electrotechnical Commission Recommendations No. IEC 

60947-2.

Th

Trip Units are AC only devices that 

employ

microprocessor based technology that provides 

true

RMS current sensing means for proper correlation

with thermal characteristics of conductors and equipment.  

The primary function of the Trip Unit is circuit protection.  

This is achieved by analyzing the  secondary current

signal received from the circuit breaker current sensors and 

initiating trip signals to the circuit breaker shunt trip when 

pre-set current levels and time delay setting are exceeded.  

Low level ground fault protection with an adjustable time 

delay is supplied when appropriate trip types are selected.

In open air at 40º C, a N-Frame Circuit Breaker with a  

Trip Unit will carry continuously up to 1200 amperes without 

exceeding a 50º C rise at the terminals.  The calibration 

of the trip unit is insensitive to ambient temperatures over 

a range of -20º to +55º C.  However, the trip unit contains 

thermal temperature protective circuitry that initiates a trip 

operation for self-protection if the internal ambient tem-

perature at the printed circuit board (PCB) reaches approxi-

mately 90º C.  For ambient conditions above 40º C, derat-

ing of the circuit breaker should be considered to avoid 

exceeding a safe terminal temperature operation range.  

Consult 

Allen-Bradley

 for recommendations.

Figure 1-1 N-Frame Circuit Breaker

Bul. 140

U

Содержание Allen-Bradley 140U

Страница 1: ...ac cordance with Underwriters Laboratories Inc Standard UL 489 and satisfy the requirements of the International Electrotechnical Commission Recommendations No IEC 60947 2 The Trip Units are AC only d...

Страница 2: ...r the cabling to cool off Short delay Instantaneous Trip For short circuit con ditions that exceed the short delay pick up settings the trip units initiate a trip after a delay prescribed by the I t r...

Страница 3: ...Shunt Trip Undervoltage Release Mechanism Handle Reset 40752 096 Note Shunt trip and undervoltage accessories if re quired must be mounted in the left pole Note Trip unit versions with ground fault pr...

Страница 4: ...h existing equipment ratings and system requirements Inspect the circuit breaker for completeness and check for damage before mounting 2 2 Accessory Installation Note If required internal accessory in...

Страница 5: ...it Breaker Escutcheon Dimensions CIRCUIT BREAKER COVER CONSTRAINTS MOVING PARTS DO NOT OPERATE THE BREAKER WITHOUT THE COVER INSTALLED CAUTION C Handle L 3 438 87 31 C L Breaker 2 50 R 6 35 R 1 718 43...

Страница 6: ...ground fault protection connect the neutral current sensor and ground fault alarm unit as HAZARDOUS VOLTAGE CONDITIONS CAN CAUSE DEATH OR SEVERE PERSONAL INJURY MAINTAIN ORIGINAL ELECTRICAL CLEARANCE...

Страница 7: ...s the circuit breaker tripping function and may be used to periodically exercise the operating mechanism Figure 3 1 Circuit Breaker Manual Controls 16 000 OVER ALL LENGTH 8 625 14 750 OF MTG HOLES 3 8...

Страница 8: ...me will be shorter 4 5 Isd Setting in multiples of IR For short circuit conditions that exceed the short delay pick up setting the trip unit initiates a trip after a predetermined delay 4 6 The Ig xIn...

Страница 9: ...he two lowest settings of the INST switch 2 5x and 4 0x For example a 1200A In NG breaker with the switch set to 2 5x would trip instantaneously when the current exceeded 3000A 4 13 The adjustable INS...

Страница 10: ...a period of 38 seconds If the current drops below the 95 value the contact will open The yellow and green wires that exit the right side of the breaker are the common C and nor mally NO of this relay...

Страница 11: ...es normal feed installation Neutral sensor is wired identi cally for reverse feed applications Figure 5 1 Neutral Sensor Outline Polarity Markings 2 188 55 58 2 75 69 85 M12 1 75 Tapped Holes 4 Places...

Страница 12: ...ARE SUITABLE FOR THE JOB 6 1 Remove dust dirt soil grease or moisture from the surface of the circuit breaker using a lint free dry cloth brush or vacuum cleaner Do not blow debris into the cir cuit...

Страница 13: ...neutral current passing current through the neutral sensor only will not properly test the ground fault feature 7 3 4 Using a low voltage 0 24V high current AC source apply a test current of 125 of th...

Страница 14: ...Test with a Four Wire System Figure 7 1c Connections for Ground Fault No Trip Test with a Three Wire System Source Low Voltage Source L C R N Load Current Limiting Resistor if required Source Low Volt...

Страница 15: ...15 40752 195 1 Effective 2 2011 NOTES...

Страница 16: ...over all contingencies should be consulted THERE ARE NO UNDERSTANDINGS AGREEMENTS WARRANTIES EXPRESSED OR IMPLIED INCLUDING WARRANTIES OF FITNESS FOR A PARTICULAR PUR POSE OR MECHANTABILITY OTHER THAN...

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