UB40.241
UB-Series
24V,
40A,
DC-UPS
Jun. 2020 / Rev.0.1 DS-UB40.241-EN All values are typical figures specified at 24Vdc input voltage, 40A output current in
power supply mode at 25°C ambient, no charging and after a 5 minutes run-in time unless otherwise noted.
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14.
L
IFETIME
E
XPECTANCY
The Lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the lifetime
expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according to the
capacitor’s manufacturer specifi
cation. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years
(131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.
Lifetime expectancy
457 000h
Power supply mode, 20A and 40°C, fully charged
1 370 000h
Power supply mode, 20A and 25°C, fully charged
322 000h
Power supply mode, 40A and 40°C, fully charged
842 000h
Power supply mode, 40A and 25°C, fully charged
15.
MTBF
MTBF stands for
M
ean
T
ime
B
etween
F
ailure, which is calculated according to statistical device failures, and indicates reliability of a
device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that
statistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit
has been running for 50 000h or only for 100h.
For these types of units, the MTTF (
M
ean
T
ime
T
o
F
ailure) value is the same value as the MTBF value.
MTBF SN 29500, IEC 61709
T.B.D.
Power supply mode, 40A and 40°C
T.B.D.
Power supply mode, 40A and 25°C
MTBF MIL HDBK 217F
T.B.D.
Power supply mode, 40A and 40°C; Ground Benign GB40
T.B.D.
Power supply mode, 40A and 25°C; Ground Benign GB25
T.B.D.
Power supply mode, 40A and 40°C; Ground Fixed GF40
T.B.D.
Power supply mode, 40A and 25°C; Ground Fixed GF25
