Datasheet

QT40.241, QT40.242
Q-Series
24V, 40A, THREE PHASE INPUT
12. LIFETIME EXPECTANCY AND MTBF
QT40.241 3AC 400V 3AC 480V
Calculated lifetime expectancy
*)
69 000h 66 000h at 24V, 40A and 40°C
86 000h 81 000h at 24V, 32A and 40°C
114 000h 112 000h at 24V, 20A and 40°C
196 000h
*)
186 000h
*)
at 24V, 40A and 25°C
244 000h
*)
230 000h
*)
at 24V, 32A and 25°C
322 000h
*)
316 000h
*)
at 24V, 20A and 25°C
QT40.242 3AC 400V 3AC 480V
Calculated lifetime expectancy
*)
93 000h 91 000h at 24V, 40A and 40°C
132 000h 128 000h at 24V, 32A and 40°C
168 000h
*)
167 000h
*)
at 24V, 20A and 40°C
262 000h
*)
258 000h
*)
at 24V, 40A and 25°C
373 000h
*)
363 000h
*)
at 24V, 32A and 25°C
475 000h
*)
472 000h
*)
at 24V, 20A and 25°C
QT40.241, QT40.242 3AC 400V 3AC 480V
MTBF
**)
SN 29500, IEC 61709 375 000h 369 000h at 24V, 40A and 40°C
685 000h 678 000h at 24V, 40A and 25°C
MTBF
**)
MIL HDBK 217F 158 000h 157 000h at 24V, 40A and 40°C; Ground Benign GB40
211 000h 210 000h at 24V, 40A and 25°C; Ground Benign GB25
*) The calculated 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 specification. 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.
**) MTBF stands for Mean Time Between Failure, 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.
Dec. 2016 / Rev. 2.4 DS-QT40.241-EN
All parameters are specified at 24V, 40A, 3x400Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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12/29