Serviceline Industrial Sensors
Serviceline Explosion Protection

Surge Protection Barrier M-LB-Ex-2144

  • Surge protection barrier for 2 signal lines
  • Nominal voltage 24 V DC
  • Surge protection barrier for grounded signal lines
  • Max. surge current (8/20 µs) 20 kA
  • Connection via screw terminals
  • DIN rail mountable
  • Up to SIL 3 acc. to IEC/EN 61508

Please note: All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH or Pepperl+Fuchs AG, also apply to Pepperl+Fuchs SE.

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of  M-LB-Ex-2144

General specifications
Number of protected signal lines2
Functional safety related parameters
Safety Integrity Level (SIL)SIL 3
Electrical specifications
Connectionprotected area: terminals 4, 5
unprotected area: terminals 2, 3
shielding/grounding: terminal 1 (optional)
Rated current500 mA , restrictions see derating tables
UL : 400 mA , restrictions see control drawing
Leakage current< 6 µA at 24 V and 25 °C (77 °F) , line-line
Nominal voltage24 V DC
Maximum continuous operating voltage30 V DC
Series resistance≤ 3 Ω per line
Impulse rating1 kV/0.5 kA (category C1)
10 kV/5 kA (category C2)
1 kA (category D1)
Impulse discharge current (10/350 µs)1 kA per line (2x)
Nominal discharge current (8/20 µs)5 kA per line (10x)
Total discharge current (8/20 µs)20 kA (1x) , overstressed fault mode 3 acc. to IEC 61643-21
Voltage protection levelmax. 45 V line-line for nominal discharge current In
max. 60 V line-earth for nominal discharge current In
Impulse reset time< 500 ms
Insertion loss≤ 3 dB at 0 ... 700 kHz in 100 Ω system
Electromagnetic compatibilityEN 61326-3-1:2017
Degree of protectionIEC 60529:2013
Functional safetyIEC/EN 61508:2010
Surge protective devices for low voltageIEC 61643-21:2000+A1:2008+A2:2012
Ambient conditions
Ambient temperature-40 ... 80 °C (-40 ... 176 °F)
Observe the temperature range limited by derating, see section derating.
Storage temperature-40 ... 85 °C (-40 ... 185 °F)
Relative humiditymax. 95 % , without condensation
Mechanical specifications
Degree of protectionIP20 , after mounting of the insulation spacer
Connectionscrew terminals , max. core cross section 1 x 2.5 mm2
MaterialPolyamide (PA)
Massapprox. 32 g
Dimensions6.2 x 93 x 72.4 mm (0.24 x 3.7 x 2.8 inch) (W x H x D)
Mountingon 35 mm DIN mounting rail acc. to EN 60715:2001
Data for application in connection with hazardous areas
EU-type examination certificateKIWA 19 ATEX 0003 X
MarkingEx-Hexagon II 2(1)G Ex ia [ia Ga] IIC T6...T4 Gb
Ex-Hexagon II (1)D [Ex ia Da] IIIC
Ex-Hexagon I (M1) [Ex ia Ma] I
Temperature classT6, T5 or T4 , restrictions see derating tables
Voltage30 V
Current500 mA , restrictions see derating tables
Internal capacitancenegligible
Internal inductance20 µH
Directive conformity
Directive 2014/34/EUEN IEC 60079-0:2018+AC:2020 , EN 60079-11:2012
International approvals
UL approvalE501704
Control drawing116-0479
Current400 mA , restrictions see control drawing
Breakdown voltage30 ... 45 V line-line at 100 V/s acc. to UL 497B
30 ... 45 V line-earth at 100 V/s acc. to UL 497B
< 1000 V at 100 V/µs acc. to UL 497B
IECEx approval
IECEx certificateIECEx KIWA 19.0003X
IECEx markingEx ia [ia Ga] IIC T6...T4 Gb
[Ex ia Da] IIIC
[Ex ia Ma] I
General information
Supplementary informationObserve the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see


ECLASS 11.027130805
ECLASS 10.0.127130805
ECLASS 9.027130805
ECLASS 8.027130805
ECLASS 5.127130801
ETIM 8.0EC000941
ETIM 7.0EC000941
ETIM 6.0EC000941
ETIM 5.0EC000941
UNSPSC 12.139121610

Documents: M-LB-Ex-2144

ManualsLanguageFile TypeFile Size
Functional Safety ManualENGPDF602 KB
ManualENGPDF2037 KB
HandbuchGERPDF2025 KB
Handbuch Funktionale SicherheitGERPDF612 KB
Instruction manuals
ИнструкцииBULPDF147 KB
Návod k poużitíCZEPDF140 KB
Instruktions manualDANPDF159 KB
Instruction manualENGPDF164 KB
KasutusjuhendESTPDF135 KB
KäyttöohjeFINPDF135 KB
Manuel d'instructionsFRAPDF162 KB
BetriebsanleitungGERPDF165 KB
Οδηγίες χρήσηςGREPDF169 KB
HandleidingHOLPDF160 KB
Instruction manual / BetriebsanleitungHRVPDF158 KB
Használati útmutatóHUNPDF161 KB
Manuale di istruzioniITAPDF140 KB
Lietošanas pamācībaLAVPDF139 KB
Instrukciju vadovasLITPDF140 KB
Instrukcja obsługiPOLPDF141 KB
Manual de instruçõesPORPDF160 KB
Manual de utilizareRONPDF159 KB
ИнструкцииRUSPDF166 KB
Návod na poużitieSLKPDF160 KB
Navodila za uporaboSLVPDF138 KB
Manual de instruccionesSPAPDF140 KB
ManualSWEPDF157 KB

Approvals+Certificates: M-LB-Ex-2144

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-4287APDF90 KB
Canada ULE501881 cUL (QVSI7)LINK---
Canada, USA UL Hazardous LocationCoC 20210517 - E501881 RepRef 20210517PDF423 KB
China SITIIAS CCC Ex Certificate2020322304002752 (Singapore)PDF1267 KB
EAC VELES EAC TP TC 012/2011EAEC RU C-DE.AD07.B.03840/21PDF1795 KB
Europe KIWA I (M1) II 2(1)G ATEX II (1) DKIWA 19 ATEX 0003 XPDF116 KB
Worldwide CSA IECEx Certificate of ConformityIECEx KIWA 19.0003XLINK---
Worldwide TUV Rheinland Functional Safety Certificate968/FSP 1856.00/19PDF620 KB
Worldwide ÖVE (Austria) Surge Protective DeviceAT 4406PDF352 KB
Control drawings
Control Drawing UL / Control Drawing UL   PDF334 KB

Associated Products: M-LB-Ex-2144

Matching System Components
Accessory Surge Protection, For equipotential bonding via DIN mounting railpa
For surge protection system M-LB-2000, Color black, DIN rail mountablepa

Function: M-LB-Ex-2144

The device limits induced transients of different causes, e. g. lightning or switching operations. The limitation is achieved by diverting the current to earth and limiting the signal loop voltage during the duration of the overvoltage pulse.

The device is used for intrinsic safety applications.

The device is HART transparent.

The device is mounted on a 35 mm DIN mounting rail according to EN 60715.

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