Eaton Magnum PXR - Usual Service Conditions; Normal Environmental Conditions; Ambient Temp and Thermal Derating Tables

65
Maintenance, testing, and operating conditions
MAGNUM PXR PRODUCT GUIDE PA013006EN September 2022 www.eaton.com
6
Usual service conditions
Normal environmental conditions
Magnum PXR is designed to be used in a wide range of
environmental conditions, however, certain conditions
can affect the breaker’s longevity. The recommended
environmental conditions are outlined in Table 26. These
conditions will best prevent any breaker deterioration from
environmental factors.
Table 26. Normal operating conditions
Normal operating conditions
Temperature Ambient temperature between 15°C to 30°C
(59°F to 86°F)
Percent load <80% of I
n
(sensor rating)
Relative humidity 40–70% in a noncondensing environment
Corrosive atmosphere Clean, dry, noncorrosive atmosphere
Salt environment No salt mist
Dust Protected by switchboard or switchgear assembly
with proper ventilation
Vibration Continuous vibration <0.2 g
Table 27. Heat loss data a
Estimated heat loss per breaker (Watts)
Breaker frame Drawout mounting only
800
1600
2000
150
329
374
3200
4000
5000
6000
719
749
1000
1440
a
For lower than maximum load currents, watt loss may be estimated by
reducing the full load loss by the following:
W
L
=(I
L
/I
FL
)
2
WFL
Where:
W
L
= Load Watts
W
FL
= Full Load Watts
I
L
= Actual Load Current
I
FL
= Full Load Current
Ambient temp and thermal derating tables
Magnum breakers are tested and fully rated for use in
ambient temperatures from 0°C to 40°C. Thermal de-rating
tables are provided for different Magnum breakers operat-
ing in switchboards at various ambient temperatures above
40°C.The switchboard’s ambient should be estimated
using an industry accepted calculation method.
Table 28. Calculated de-rated capacity ANSI standard
Frame Actual ambient temperature (ºC)
40 45 50 55 60 70
800 800 800 800 794 738 612
1600 1600 1600 1600 1600 1592 1321
2000 2000 2000 1995 1869 1735 1439
2500 2500 2395 2259 2116 1965 1630
3000 3000 2845 2684 2514 2334 1936
3200 3200 3098 2922 2737 2541 2108
4000 4000 4000 3815 3574 3318 2752
5000 5000 5000 4716 4417 4101 3402
Table 29. Calculated de-rated capacity ANSI narrow
Frame Actual ambient temperature (ºC)
40 45 50 55 60 70
800 800 800 800 800 800 800
1200 1200 1200 1200 1200 1200 1101
1600 1600 1600 1526 1429 1327 1101
2000 2000 1916 1807 1693 1572 1304
 Shaded means no loss in derating
Low Temp breaker offering
For sub-0°C temperature conditions, Eaton offers anti-
freeze grease option. This anti-freeze grease can be used
in place of standard lubricant when temperatures are
below 0°C and can be used in environments no colder
than -57°C. When servicing in the field the special anti-
freeze grease must be utilized. If not, then low tempera-
ture operation may be compromised. This option must be
ordered from the factory.