1 EMT6 Thermistor Overload Relays for Machine Protection
1.4 Technical safety data
EMT6
10/16 MN03407006Z-DE/EN
www.eaton.com
43
1.4 Technical safety data
Eaton has determined the following functional safety characteristics for
EMT6-K, EMT6-KDB, and ENMT6-DBK thermistor overload relays for
machine protection:
As per Table 1 of DIN EN 50495/2010, the requirements for safety integrity
level SIL 1 apply to the safety device. This corresponds to a Performance
Level of PL c as per Table 4 of DIN EN ISO 13849-1.
ATEX-specific safety data as defined in DIN EN ISO 13849-1
The motor protection function of EMT6... thermistor overload relays for
machine protection, as defined in ATEX, is characterized by the following
safety data:
ATEX-specific safety data as defined in DIN EN 61508-2
The motor protection function of EMT6... thermistor overload relays for
machine protection, as defined in ATEX, is characterized by the following
safety data:
Performance level acc. to DIN EN ISO 13849-1
c
Device category acc. to DIN EN ISO 13849-1
1
MTTF
d
for 40 °C
56.6 years
MTTF
d
for 60 °C
35.6 years
Safety integrity level
SIL 1
Architecture
1oo1
Hardware fault tolerance HFT
0
Failure rate for undetected safe failures (
λ
su
)
278.09 x 10
-9
/h
Failure rate for detected safe failures (
λ
sd
)
1001.67 x 10
-9
/h
Failure rate for undetected dangerous failures (
λ
du
)
1026.25 x 10
-9
/h
Failure rate for detected dangerous failures (
λ
dd
)
78.80 x 10
-9
/h
Average probability of a dangerous failure when the
safety function (PFD) is on demand, using an interval of
36 months for repeat test T1:
1.35 x 10
-2
/h
(Requirement for SIL 1 as per
standard
≧
10
-2
/h to 10
-1
/h)
￫
Information regarding failure rates at higher ambient
temperatures (> 40 °C) is available on request.
