Serviceline Industrial Sensors
Serviceline Explosion Protection

Surge Protection Barrier FN-LB-I

  • 1-channel
  • Field mount module
  • ½ NPT thread
  • Stainless steel housing
  • Max. surge current (8/20 µs) 20 kA
  • 500 V isolation from earth
  • Suitable for hazardous area

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, also apply to Pepperl+Fuchs AG.

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of  FN-LB-I

Product Description
NPT1/2 thread
General specifications
Number of protected signal lines1
Rated voltage≤ 48 V
Rated current≤ 250 mA
Leakage current≤ 5 µA
On-state voltage≤ 85 V
Ground insulation≥ 500 V breakdown voltage
Electrical specifications
Total discharge current (8/20 µs)20 kA
Degree of protectionIEC 60529:2001
Ambient conditions
Ambient temperature-30 ... 60 °C (-22 ... 140 °F) For usage in hazardous area observe EC-type examination certificate.
Mechanical specifications
Housing materialStainless steel 1.4401 (AISI 316)
surface all over polished
Degree of protectionIP67
Length0.3 m
Massapprox. 200 g
DimensionsAF22 x 77 mm (0.9 x 3 inch)
MountingNPT1/2 thread
Data for application in connection with hazardous areas
EU-Type Examination CertificatePTB 00 ATEX 2175
MarkingEx-Hexagon II 2G EEx ia IIC T6
Voltage50 V
Maximum leakage current10 kA line to ground (common), 5 kA line to line (differential) in accordance to IEC 60-2
Nominal response time
Symmetrical1 ns
Asymmetric100 ns
Bandwidth≥ 40 kHz
Directive conformity
Directive 2014/34/EUEN 60079-0:2012+A11:2013 , EN 60079-11:2012
International approvals
CSA approval
Control drawing116-0187 (cCSAus)
General information
Supplementary informationEC-Type Examination Certificate, Statement of Conformity, Declaration of Conformity, Attestation of Conformity and instructions have to be observed where applicable. For information see

Documents: FN-LB-I

ManualsLanguageFile TypeFile Size
Brief instructions Surge Protection BarriersENGPDF876 KB
Functional Safety ManualENGPDF481 KB
Manual Surge Protection BarriersENGPDF1151 KB
Handbuch ÜberspannungsschutzbarrierenGERPDF2002 KB
Kurzanleitung ÜberspannungsschutzbarrierenGERPDF891 KB
Instruction manuals
ИнструкцииBULPDF0 KB
Návod k poużitíCZEPDF121 KB
Instruktions manualDANPDF119 KB
Instruction manualENGPDF43 KB
KasutusjuhendESTPDF117 KB
KäyttöohjeFINPDF117 KB
Manuel d'instructionsFRAPDF126 KB
BetriebsanleitungGERPDF45 KB
Οδηγίες χρήσηςGREPDF127 KB
HandleidingHOLPDF119 KB
Instruction manual / BetriebsanleitungHRVPDF119 KB
Használati útmutatóHUNPDF0 KB
Manuale di istruzioniITAPDF123 KB
Lietošanas pamācībaLAVPDF120 KB
Instrukciju vadovasLITPDF0 KB
Instrukcja obsługiPOLPDF0 KB
Manual de instruçõesPORPDF120 KB
Manual de utilizareRONPDF0 KB
Návod na poużitieSLKPDF121 KB
Navodila za uporaboSLVPDF118 KB
Manual de instruccionesSPAPDF124 KB
ManualSWEPDF119 KB

Approvals+Certificates: FN-LB-I

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-0969PDF68 KB
Canada, USA CSACoC 1128189PDF62 KB
China NEPSIGYJ 15.1342XPDF1274 KB
EAC EAC TP TC 012/2011TC RU C-DE.AA71.B.00140PDF2600 KB
Europe PTB ATEX Category 2 GPTB 00 ATEX 2175PDF353 KB
exida Functional Safety AssessmentP+F 11-10-085 R036 V1R0PDF477 KB
Control drawings
Control Drawing CSA / Control Drawing CSA   PDF179 KB

Function: FN-LB-I

This Surge Protection Barrier limits induced transients of different origin (e. g. lightning stroke, switching impulse, etc.). This is achieved by diverting the transient current to ground and limiting the signal line voltage to a safe level for the duration of the surge.

This barrier provides 85 V line-to-line and 500 V line-to-ground clamping voltage for the protected instruments. It also protects instruments that have less than 500 V isolation-to-ground.

It is installed in an available conduit or cable gland opening like those found on most process transmitters.

For additional information, refer to the manual and

Note: Surge Protection Barriers must always be connected to a solid and effective ground and be at the same equipotential level as the instrument it is protecting. The ground system must comply with all applicable regulations.