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WEG Molded Case Circuit Breakers - User’s Manual
10
1. Remove dust, dirt, soot, 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 circuit breaker. If contamination is found, look for the source and
eliminate the problem.
2. Switch circuit breaker to ON 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 circuit breaker.
4. Check base, cover, and operating handle for cracks, chipping, and discoloration.
Circuit breakers should be replaced if cracks or severe discoloration is found.
5. Check terminals and connectors for looseness or signs of overheating.
Overheating will show as discoloration, melting, or blistering of conductor
insulation, or as pitting or melting of conductor surfaces due to arcing. If
there is no evidence of overheating or looseness, do not disturb or tighten
the connections. If there is evidence of overheating, terminations should be
cleaned or replaced. Before re-energizing the circuit breaker, all terminations
and cable should be refurbished to the condition when originally installed.
6. Check circuit breaker mounting hardware, and tighten if necessary.
7. Check area where circuit breaker is installed for any safety hazards, inlcuding
personal safety and fire hazards. Exposure to certain types of chemicals can
cause deterioration of electrical connections.
4.2. FIELD TESTING
Any field testing should be done in accordance with applicable NEMA Standard.
The instructions for installation, testing,maintenance, or repair herein are provided
for the use of the product in general commercial applications and may not be
appropriate for use in nuclear applications. Additional instructions may be available
upon specific request to replace, amend, or supplement these instructions to
qualify them for use with the product in safety-related applications in a nuclear
facility.
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.
The sale of the product shown in this literature is subject to the terms and conditions
outlined in appropriate WEG selling policies or other contractual agreement
between the parties. This literature is not intended to and does not enlarge or add
to any such contract. The sole source governing the rights and remedies of any
purchaser of this equipment is the contract between the purchaser and WEG.
NO WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WARRANTIES
