Overvoltage category
III
Contamination level
2
Rated insulation voltage U
I
690 V
Safe separation up to U
I
500 V
7.4 Other Specifications
Form
PA 6
Dimensions (H x W x T) [mm]
82.5 x 69.5 x 29.5
Wire connection, solid wire
1 x 0.5–1.5 mm
2
(AWG 20–16 solid wire)
Insulation strip length
8.5–9.5 mm (0.33–0.37 in)
Protection rating IEC 60529
IP20
Weight
≈50 g (1.7 oz)
7.5 Safety Characteristics of the Built-in MCB 112
The safety characteristics include the connection between output safe stop T37 (output X44/12 on VLT
®
PTC Thermistor Card MCB
112) and terminal 37 input on the control card.
Table 8: Safety Integrity Level SIL (EN 61508)
Operating mode
Hardware architecture
Fault tolerance HFT
Safety integrity level
Subsystem
Low demand mode
1oo1
0
SIL 2
Type A device
Table 9: Safety-related Parameters, Part 1
MCB 112
MTBF
SFF
λ
SD
λ
SU
λ
DD
λ
DU
T
a
=40 °C
44 years
96,5%
2103 x 10
-9
/h
41.8 x 10
-9
/h
1.23 x 10
-9
/h
81.4 x 10
-9
/h
Table 10: Safety-related Parameters, Part 2
MCB 112
Proof test interval
1 year
3 years
5 years
10 years
T
a
=40 °C
PFD
avg
3.37E-04
1.01E-03
1.68E-03
3.37E-03
Observe the proof test interval according to EN 60079-17 for electrical equipment ≤3 years.
The data of the functional safety stated in
are valid for an ambient temperature of 40 °C (104 °F). Data for more
ambient temperatures can be obtained on request.
AQ267038105120en-000101 / 130R0104
30 | Danfoss A/S © 2022.08
Specifications
VLT® PTC Thermistor Card MCB 112
Operating Guide