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WEG Molded Case Circuit Breakers - User’s Manual

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WEG Molded Case Circuit Breakers - User’s Manual

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Summary of Contents for UBW120

Page 1: ...Motors Automation Energy Transmission Distribution Coatings User s Manual WEG Molded Case Circuit Breakers UBW1200 ...

Page 2: ...s codes and procedures The recommendations and information contained herein are based on WEG 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 WEG for further information or instructions 1 INTRODUCTION The UBW1200 Circuit Breaker Figure 1 are 690 V ac maximum rated devices 600 V for...

Page 3: ...s 1 Occurs with short delay time adjustment set at 1 2 The molded case switch has a fixed instantaneous setting The UBW1200 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...

Page 4: ...kit 1 5 INTERNAL ACCESSORIES Internal accessories mount in the breaker Notes Shunt trip and undervoltage accessories if required must be mounted in the left pole Digitrip 310 trip unit versions with ground fault protection are supplied with an auxiliary switch mounted in the right pole of the trip unit This instruction leaflet gives procedures for instalattion and field testing on UBW1200 circuit ...

Page 5: ... for front mounted bus connections socket cap screws are recommended Terminal Cat No Wire size MCM Cond Mat l Torq lb in Torq N m LT1B2 UBW700 1 500 2 Cu Al 375 42 4 LT1B3 UBW1000 3 0 400 3 Cu Al 375 42 4 LT1B4 UBW1200 4 0 500 4 Cu Al 375 42 4 LT1B3 UBW1200 500 750 3 Cu Al 450 50 9 Table 3 torque table domestic Install accessories per the accessory instruction leaflet Caution Circuit breaker cover...

Page 6: ...pplications cut out cover to correct escutcheon dimensions see Figure 4 Circuit breaker Load end Handle 2 750 69 85 3 pole 1 375 34 92 0 312 18 M8 1 25 tap 4 places Figure 3 breaker mounting bolt drilling plan 800 A 1200 A circuit breaker Note dimensions in inches milimeters Handle Breaker 6 375 161 92 3 187 80 95 1 500 38 10 5 587 141 91 1 906 48 41 1 718 43 64 3 438 87 31 188 R 4 76 R 2 50 R 6 3...

Page 7: ...um conductors are used the application of a suitable joint compound is recommended to reduce the possibility of terminal overheating Connect line and load conductors and accessory leads After the circuit breaker is installed and all connections are made check all mounting hardware and terminal connection hardware for torque loading Torque values for line load terminal lugs are given on table in Fi...

Page 8: ...ery additional 6 with 5 wraps or every additional 1 25 4 mm with 1 wrap 2 5 ADJUSTING TRIP SETTINGS The UBW1200 circuit breakers have the trip unit built in as an integral part of the breaker The trip unit is not field replaceable The various trip unit settings are described in Section 4 They should be adjusted as required at this point 3 OPERATION 3 1 MANUAL OPERATION Manual operation of the circ...

Page 9: ...d to periodically exercise the operating mechanism Removable terminal cover Removable terminal cover 3 terms units 1 719 43 7 6 terms units 3 219 81 8 9 terms units 4 719 119 9 8 250 209 6 4 125 104 8 2 799 71 1 3 819 97 0 16 000 406 4 14 750 374 7 11 500 292 1 9 250 235 0 8 625 219 0 7 000 177 8 Over all length Of MTG holes Of termials Handle 1 375 2 490 63 2 2 750 69 9 4x 0 344 8 7 MTG holes 0 7...

Page 10: ...tiated trip or a manual push to trip operation the circuit breaker is reset by moving the circuit breaker handle to the extreme OFF position Caution Lack of illumination of the status light does not indicate the terminals of the breaker are deenergized 4 310 TRIP UNIT ADJUSTMENTS 1 2 3 10 11 3 4 5 Figure 7 14 12 13 Figure 8 ...

Page 11: ...on light As previously stated the LED is used as a no trip indicator when using the test port In normal modes this LED indicates a high load alarm It will light if the continuous current is 95 of the setting and must be present for a 38 second duration 3 IR continuous current setting in accordance with standards requirements the trip unit initiates a trip of the circuit breaker within 2 hours for ...

Page 12: ...to 2 5x would trip instantaneously when the current exceeded 3000 A 10 The adjustable INSTantaneous Ii Mode has four settings from 6x to 9x For example a 800 A In breaker with the Ii switch set to 7x would trip instantaneously with the current at or above 5600 A The last setting on the Ii switch can be one of three values depending on the frame current 800 A 28 1200 A 12 11 On an UBW1200 without m...

Page 13: ...and OFF several times to be sure that the mechanical linkages are free and do not bind If mechanical linkages are not free replace circuit breaker 3 With the circuit breaker in the ON position press the PUSH TO TRIP button to mechanically trip the circuit breaker Trip reset and switch circuit breaker ON several times If mechanism does not reset each time the circuit breaker is tripped replace the ...

Page 14: ...www weg net WEG Molded Case Circuit Breakers User s Manual 14 NOTES ...

Page 15: ...www weg net WEG Molded Case Circuit Breakers User s Manual 15 NOTES ...

Page 16: ... Phone 233 30 2766490 info zestghana com gh INDIA Bangalore Karnataka Phone 91 80 41282007 info in weg net Hosur Tamil Nadu Phone 91 4344 301577 info in weg net ITALY Cinisello Balsamo Milano Phone 39 2 61293535 info it weg net JAPAN Yokohama Kanagawa Phone 81 45 5503030 info jp weg net MALAYSIA Shah Alam Selangor Phone 60 3 78591626 info wattdrive com my MEXICO Huehuetoca Mexico Phone 52 55 53214...

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