60/70/80/90 SERIES
FAN CONTACTORS
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- Measurements on 70 series locomotives indicates that the original OEM fan contactors are marginally rated for the operation encountered:
- FCF-B steady state current exceeds contactor rating by approximately 15 percent
- FCF-B starting surge current exceeds contactor rating by approximately 67 percent
- FCS steady state current exceeds rating by approximately 10 percent
Cooling Fan/Blower Contactor Ratings
Original Installation Versus RSA Upgrade
Existing OEM Contactor
NEMA Size 3
AC-3 Rating - 90 amps
Surge Rating - 800 amps
RSA Contactor
NEMA Size 4
AC-3 Rating - 180 amps
Surge Rating - 1800 amps
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| 70 SERIES FAN CONTACTORS |
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