Description
2.4 Standards and guidelines
3VA molded case circuit breakers with UL and IEC certification
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Manual, 01/2019, L1V30435333-01
The following standards-related criteria are complied with:
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IEC / EN 60068-2-2 "Bd" and IEC / EN 60068-2-1 "Ab":
Temperature range: -25 °C … +70 °C
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IEC / EN 60068-2-30 "Db"
Humid heat up to +55 °C and air humidity up to 95 %
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IEC / EN 60068-2-6 "Fc"
Vibration test
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IEC / EN 60068-2-27 "Ea"
Shock resistance test
Between the tests of compliance with the standards and at the end of the tests, the usability
of the devices is assured with the "Verification of operation characteristics".
Vibration resistance and shock resistance
3VA UL molded case circuit breakers are insensitive to vibrations and meet the requirements
relating to mechanical and electromechanical vibration strength according to IEC / EN 60068
and the specifications of the shipbuilding societies.
The circuit breakers resist impacts of up to 10 g without tripping and are tested to withstand
without damage their operating conditions with shock impact according to IEC /
EN 60068-2 27 "Ea" with 150 m/s² / 11 ms.
Installation altitudes
When 3VA5 and 3VA6 molded case circuit breakers are used at up to 6562 ft or 2000 m
above sea level, the rating data will not change.
An installation altitude above 6562 ft or 2000 m can result in higher temperatures on the
switching devices. The lower density of air can significantly reduce heat dissipation, making
it necessary to decrease rated operational voltage, the rated uninterrupted current and the
short-circuit values.
Refer to the table below for the calculation factor for determining the key values:
