Panasonic is part of a large worldwide groupselling relays and associated switching products under different brand names in different territories.The conditions of use in some territories may differ from those customary in Europe. In particular there are often major differences in regard to national and international specifications, such as UL, CSA, VDE, SEV, EVE, SEMKO, etc. Thus, when considering contact loads as stated in this catalogue (e.g. 10 A, 30 VDC for the SP relay) its hould be understood that these values are not necessarily an absolute maximum but tested ratings. Mostly the stated value has been tested for a certain life expectancy as stated by the manufacturer or the respective test house. Thus, under different conditions, the stated “maximum” may, in practice, be safely exceeded.
MTTF
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Reliability
(broad sense)
a it. Reliability (narrow sense), durability
Long life time: MTTF, Bio R(T),
Low failure rate: Lamda (^), MTBF
2.
Availability
3.
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RELIABILITY
[1] WHAT RELIABILITY?
1. Maintainability
MTTR
Preventive maintenance, predicted
maintenance
3.
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th life tim ilu . F
o lie ira .e. Design reliability
Human factor, redundancy,
fool-proof, fail-safe
[2] RELIABILITY MEASURES
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Reliabilitymeasure Sample
representation
DegreeofreliabilityR(T) 99.
2.9%
MTBF 100hours
MTTF 100hours
FailurerateX 20fit,1%/hour
SafelifeB10 50hours
(a) R(T)
(b) MTTF
1. Failure Rate
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Term
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ds_x61_en_relay_technical_information_091112D 631
T
TechnicalInfo. MTBF
M tim e
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3. Intrinsic Reliability and Reliability
of Use
R lia ility ilt” is
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.
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