Rockwell Automation 1502 400 Amp Medium Voltage Contactor (Series D) - Manual (Page 48)

4-20 Maintenance
1502-UM050D-EN-P – June 2013
Altitude Adjustment
Altitude will affect the performance of a vacuum contactor. Atmospheric
pressure assists in closing the main contacts by exerting force on the bellows at
the movable end of the vacuum bottles. The force is proportional to the difference
between the internal bottle pressure and external atmospheric pressure and
adjustments to the operating mechanism must be made to balance the change
in closing force. The 400 A contactors are equipped with return springs
appropriate for the specific altitude they will be operating at.
If a contactor is to be moved to a different altitude, refer to Table 4.A to
determine the correct return springs for the new altitude range. Simply replace
the springs and correct the rating label information (catalog number, altitude
range and current rating) per Table 4.A. Note the change in Basic Impulse
Rating (B.I.L.) as it relates to altitude.
Table 4.A – Altitude Range Spring Requirements • 400A Mechanical Latch Contactor
Altitude Range Spring Part No. Color Code
Continuous Current
Rating
B.I.L. Rating
0-1000 m 80153-567-01 Bronze 400 A 60 kV
1000-2000 m 80026-007-02 Green 390 A 54 kV
2000-3000 m 80026-008-02 Blue 380 A 48 kV
3000-4000 m 80026-009-02 Black 370 A 42 kV
4000-5000 m 80026-010-02 Olive 360 A 36 kV
Important: A contactor will only function properly in the altitude range for
which it is set up. If functional tests are required, they must be performed at
the proper altitude or in a pressure chamber which simulates the proper
altitude.