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Summary of Contents for WEG UBW400
- Page 1 Motors | Automation | Energy | Transmission & Distribution | Coatings WEG Molded Case Circuit Breakers UBW400 User’s Manual...
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Page 2: General Information
1. INTRODUCTION 1.1. GENERAL INFORMATION The UBW400 circuit breaker (Figure 1) are 600 V ac maximum rated. UBW400 circuit breakers are listed in accordance with Underwriters Laboratories, Inc. Standard UL 489 and satisfy the (P1) requirements of the International Electrotechnical Commission Recommendations No. -
Page 3: Installation
The circuit breaker handle must be in the tripped or OFF position to remove the cover. Instructions for installing the trip unit and accessories are supplied with the devices. 3. If not already installed, mount trip unit and accessories (if required) in circuit breaker frame. WEG Molded Case Circuit Breakers - User’s Manual... - Page 4 Figure 3: cover screw installation positions Screw, No. 8 x 1.88 inch, flat head, cross-recessed, thread forming. Screw, No. 190-32 x 3.125 inch, pan head, cross-recessed. WEG Molded Case Circuit Breakers - User’s Manual...
- Page 5 For individual surface mounting, drill mounting panel using the drilling plan shown in Figure 5. For panelboard mounting, only load end support mounting holes are required. For deadfront cover applications, cut out cover to correct escutcheon dimensions, see Figure 6. WEG Molded Case Circuit Breakers - User’s Manual...
- Page 6 A note should be made of the diagrams if the labels cannot be seen when the circuit breaker is mounted. d. Install circuit breaker mounting screws, washers, and nuts. Tighten screws firmly, but do not exceed 28 pounds-inches (3 N.m). WEG Molded Case Circuit Breakers - User’s Manual...
- Page 7 Torque Terminal Screw Wire material wire wire value cat. No. head type type body range range lb-in (N.m) LT1UBW400 Aluminum Socket 250-500 (1) 120-240 Cu/Al 375 (42) Table 3: cover mounting hardware WEG Molded Case Circuit Breakers - User’s Manual...
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Page 8: Manual Operation
A circuit breaker with an electronic type trip unit can be reset immediately. No circuit breaker should be reclosed until the cause of trip is known and the situation rectified. WEG Molded Case Circuit Breakers - User’s Manual... - Page 9 Figure 9: trip unit magnetic adjustment buttons 4. INSPECTION AND FIELD TESTING UBW400 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 10: Field Testing
The information, recommendations,descriptions,and safety notations in this document are based on WEG’s experience and judgment with respect to Retrofitting of Power Breakers. This instructional literature is published solely for information purposes and should not be considered all-inclusive.If further information is required, you should consult an authorized WEG sales representative. - Page 11 WARRANTIES ARISING FROM COURSE OF DEALING OR USAGE OF TRADE, ARE MADE REGARDING THE INFORMATION, RECOMMENDATIONS, AND DESCRIPTIONS CONTAINED HEREIN, In no event will WEG be responsible to the purchaser or user in contract, in tort (including negligence), strict liability or...
- 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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