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Summary of Contents for WEG UBW250
- Page 1 Motors | Automation | Energy | Transmission & Distribution | Coatings WEG Molded Case Circuit Breakers UBW250 User’s Manual...
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Page 2: General Information
If any questions arise, contact WEG for further information or instructions. 1. INTRODUCTION 1.1. GENERAL INFORMATION The UBW250 circuit breaker (Figure 1) types UBW250 are 600 V ac maximum rated devices with... - Page 3 2) For adjustable thermal trip units, the magnetic setting is a multiple of the maximum thermal setting. This instruction leaflet (IL) gives procedures for installation and field testing of UBW250 circuit breakers. WEG Molded Case Circuit Breakers - User’s Manual...
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Page 4: Installation
To install the circuit breaker, perform the following steps. NOTICE UBW250 circuit breakers are factory sealed for reverse feed applications under UL 489. UL requires that internal accessories be installed at the factory in this type of circuit breaker. - Page 5 Screw, No. 8 x 1.88 Inch, Pan Head, Cross-Recessed, thread forming. Screw, No. 6 x 1.50 Inch, Pan Head, Cross-Recessed, Thread Forming (used with 4 pole only). Note: hatched linea show additional pole and screws for 4-pole circuit breaker. WEG Molded Case Circuit Breakers - User’s Manual...
- Page 6 When using terminal (Catalog No. LTI UBW250), secure the terminal to the circuit breaker using screw and nut. Torque to 7-9 lb.-in (0.8-1.0 N.m).
- Page 7 A note should be made of the diagrams if the labels cannot be seen when the circuit breaker is mounted. c. Position circuit breaker on mounting surface. d. Install circuit breaker mounting screws and washers. Tighten screws firmly, but do not exceed 28 pound inches (3 N.m). WEG Molded Case Circuit Breakers - User’s Manual...
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Page 8: Manual Operation
ON and OFF. On the sliding handle barrier, ON, OFF, and trip are also shown by a color-coded strip for each circuit breaker handle position: red for ON, white for tripped, and green for OFF. ON/OFF is also shown with the international symbols 1/0 (see Figure 7). WEG Molded Case Circuit Breakers - User’s Manual... -
Page 9: Circuit Breaker Reset
(In) (see Figure 8) To adjust the setting, rotate each but ton clockwise until arrow on button points to desired setting. WEG Molded Case Circuit Breakers - User’s Manual... - Page 10 Figure 8: trip unit magnetic trip adjustment buttons 3.5. INSPECTION AND FIELD TESTING UBW250 molded case circuit breakers are designed to provide years of almost maintenance-free operation. The following procedure describes how to inspect and test a circuit breaker in service.
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Page 11: Field Testing
8. The operation of circuit breakers with electronic trip units can be field-tested periodically using the Seltronic test kit. 3.7. FIELD TESTING Any field testing should be done in accordance with applicable NEMA Standard. WEG Molded Case Circuit Breakers - User’s Manual... - Page 12 Changzhou – Jiangsu Phone: +86 519 88067692 info-cn@weg.net For those countries where there is not a WEG own operation, find our local distributor at www.weg.net. WEG Group - Automation Business Unit Jaraguá do Sul - SC - Brazil 55 (47) 3276-4000 Phone: + automacao@weg.net...
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