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WEG Molded Case Circuit Breakers - User’s Manual

Figure 1:

UBW250 circuit breaker

Circuit breaker types

Trip unit types thermal-magnetic Amperes l

Fixed

thermal

Adjustable

thermal

Adjustable

magnetic of l

UBW250

250

200-250

5 to 10

Table 1:

available trip unit ratings

Notes: 1) Not UL listed.

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.

Содержание LT1 UBW250

Страница 1: ...Motors Automation Energy Transmission Distribution Coatings User s Manual WEG Molded Case Circuit Breakers UBW250...

Страница 2: ...recommendations and information contained herein are based on WEG experience and judgment but should not be considered to be all inclusive or covering every application or circumstance which may aris...

Страница 3: ...n Fixed thermal Adjustable thermal1 Adjustable magnetic of ln 2 UBW250 250 200 250 5 to 10 Table 1 available trip unit ratings Notes 1 Not UL listed 2 For adjustable thermal trip units the magnetic se...

Страница 4: ...ternal accessories be installed at the factory in this type of circuit breaker For hardware conversion kits and handle mechanisms required to replace existing WEG circuit breakers If required internal...

Страница 5: ...Care should be taken every time a thread forming screw is used to ensure the screw starts in the original threads Damaged threads can result in improper circuit breaker cover retention 4 Install cove...

Страница 6: ...d equipment can cause death or severe personal injury Before mounting the circuit breaker in an electrical system make sure there is no voltage present where work is to be per formed Special attention...

Страница 7: ...rcuit breaker handle Figure 6 circuit breaker escutcheon dimensions b If circuit breaker includes factory or field installed internal accessories make sure that accessory wiring can be reached when th...

Страница 8: ...t breaker nameplate Terminal catalog number Terminal material body Screw head type AWG wire range Metric wire range Wire type Torque value Lb in N m LT1 UBW250 Stainless steel Socket 4 350 MCM 25 185...

Страница 9: ...ermal element in the trip unit cools No circuit breaker should be reclosed until the cause of trip is known and the situation rectified 3 3 PUSH TO TRIP BUTTON The PUSH TO TRIP button checks the circu...

Страница 10: ...aid to reverse feed applications to ensure no voltage is present CAUTION Make sure that cleaning agents or solvents used to clean the circuit breaker are suitable for the job Some commercial cleaning...

Страница 11: ...the connections If there is evidence of overheating terminations should be cleaned or replaced Before reenergizing the circuit breaker all terminations and cable should be refurbished to the conditio...

Страница 12: ...hone 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...