M-LB-4244 2-channel surge protection isolator
Surge protection for 2 signal lines, rated voltage 24 V, surge protection isolator for earthed signal lines, maximum surge current (8/20 µs) 20 kA.
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Pepperl+Fuchs M-LB-4244 2-channel surge protection isolator, surge protection for 2 signal lines, rated voltage 24 V, surge protection isolator for earthed signal lines, maximum surge current (8/20 µs) 20 kA, continuous operation (automatic reset).
For lightning and switching overvoltage protection of signal lines, power lines and fieldbus lines between hazardous areas and safe areas, DIN rail or field enclosure mounting, directly connected in series in instrument loops, DCS/PLC I/O and bus trunk/spur lines.
| Parameter Name | Technical Specifications |
|---|---|
| General specifications | |
| Device type | Type 1/P1 according to EN 61643-11 |
| Number of protected signal lines | 2 |
| Topology | Earthing |
| Functional safety parameters | |
| Safety Integrity Level (SIL) | SIL 3 |
| Electrical Data | |
| Connection | Protected area: terminals 1', 2', unprotected area: terminals 1, 2 |
| Leakage current | < 10 nA at Uc, line-to-line, < 70 nA at Uc, line-to-ground |
| Rated Voltage | 24 V |
| Maximum continuous operating voltage | 23.3 V AC and 33 V DC |
| Rated load current | 0.75 A at 70 °C (158 °F) |
| Series resistance | 1 Ω per line |
| Impulse discharge current (10/350 µs) | 1.5 kA per line |
| Nominal discharge current (8/20 µs) | 5 kA per line |
| Maximum surge current (8/20 µs) | 20 kA |
| Total discharge current (8/20 µs) | 10 kA |
| Voltage protection level | max. 90 V line-to-line (at rated discharge current In), max. 75 V line-to-ground (at rated discharge current In) |
| Impulse reset time | < 30 ms |
| Cut-off frequency | 3.4 MHz, line-to-line |
| Indication/setting | |
| Display elements | Status display / operating status (green) / fault indication (red) |
| Conformity | |
| Degree of protection | IEC 60529:2013 |
| Functional safety | IEC/EN 61508:2010 |
| Low-voltage surge protective device | EN 61643-21:2001+A1:2009+A2:2013, IEC 61643-21:2001+A1:2008+A2:2012 |
| Ambient Conditions | |
| Ambient Temperature | −40 … 80 °C (−40 … 176 °F) |
| Storage Temperature | −40 … 80 °C (−40 … 176 °F) |
| Relative Humidity | Max. 95 %, non-condensing |
| Corrosion resistance | According to ISA-71.04, severity level G3 |
| Mechanical parameters | |
| Degree of protection | IP20 |
| Connection | Spring terminals (push-in connection) |
| Core cross-section | 0.2 … 2.5 mm2 one wire, 0.2 … 2.5 mm2 fine-strand |
| Housing | Polyamide PA 6.6 |
| Weight | Approx. 35 g |
| Dimensions | 6 x 90 x 69 mm (0.24 x 3.5 x 2.7 inch) (W x H x D) |
| Installation Method | Mounts on 35 mm DIN mounting rail in accordance with EN 60715:2001 |
| Hazardous area application data | |
| Certificate | TÜV 22 ATEX 8881 X |
| Marking | II 3G Ex ec IIC T4 Gc |
| Temperature class | T4 at ambient temperature ≤80 °C |
| Directive 2014/34/EU | EN 60079-0:2018, EN IEC 60079-7:2015+A1:2018 |
| International approvals | |
| UL approval | E501704 |
| IECEx certificate | IECEx TUR 22.0051X |
| IECEx marking | Ex ec IIC T4 Gc |
| General information | |
| Supplementary information | Observe the certificates, declarations of conformity, instruction manuals and manuals within the applicable scope. For related information, see www.pepperl-fuchs.com. |
- Surge protection for 2 signal lines
- Rated voltage 24 V
- Surge protection isolator for earthed signal lines
- Maximum surge current (8/20 µs) 20 kA
- Uninterrupted operation (automatic reset)
- Status indicator
- Modular design, pluggable
- Complies with IEC/EN 61508, up to SIL 3
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