Page 991 - ABB_Motor _Protection_and_Control_catalogue_20221216

ABB MOTOR PROTECTION AND CONTROL 10/17

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Terms and technical definitions

Rated operational voltage Ue
Voltage to which the contactor's utilization characteristics refer. In
three-phase it is the phase-to-phase voltage.

Rated insulation voltage Ui
Reference voltage for dielectric tests and creepage distances.

Rated impulse withstand voltage Uimp
Peak value of an impulse voltage, having a specified form and polar-
ity, which does not cause breakdown in specific test conditions.
Shock withstand
Requirement for vehicles, crane drives, installations on board ships
and plug-in equipment. For the acceptable "g" values, the contacts
must not change position and the thermal overload relays must not
trip.
Resistance to vibrations
Requirements for vehicles, boats and other means of transport. For
the specified vibration amplitude and frequency values the device
must remain able to operate.

Mirror contacts
Definitions of mirror contact acc. to IEC 60947-4-1, Annex F 2.1.
Normally closed auxiliary contact (N.C.) which cannot be in the
closed position simultaneously with the normally open (N.O.) main
contact.

Mechanically linked contact
Definitions of mechanically linked elements acc. to IEC 60947-5-1,
Annex L. Combination of "n" Make auxiliary contact element(s) and
"m" Break auxiliary contact element(s) are designed in such a way
that they cannot be in the closed position simultaneously.
One control circuit device may have more than one group of me-
chanically linked contact elements.

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