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Masterpact ® circuit breaker
appendix
Important notice:
all endurances given are based on
normal operating conditions and
conventional tests:
•
closing and opening operations at
rated current,
•
power factor: 0. 75 - 0.80.
As actual conditions differ, use these
values only as inspection guidelines and
periodically check contact wear.
Under normal operating conditions of use,
given by UL 489 or ANSI standards
(see table 3) and controlled by tests,
Masterpact circuit breakers do not require
maintenance. However, these circuit
breakers exceed, without maintenance and
additional costs, the endurances required by
standards.
See tables
1
and 3.
Service maintenance by a Merlin Gerin
representative will extend the endurance
according to table 2. This service can be
performed on site and consists in changing
contacts, arc chutes and some other parts.
Example:
MP1 6 at 480V: requires no maintenance
before 1 0,000 cycles (mechanical or
electrical).
Endurance may be increased after servicing
at 1 0,000 operations.
38
mechanical
: 3,500
electrical
. 500
ANSI
mechanical
1 1 2,500
electrical
2 ,800
2,000 1 2, 000
500
' 500
NS
4,000
NS
800
endurances
2 ,000 : 2,000 1 ,500
. 1
,500
1 ,500
•
1 ,500
500
> 5oo
400
1 400
400
, 400
. 4,000 ; NS
1 ,500
· 1
,500
NS
NS
800
' NS
400
' 400
NS
NS
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