Serviceline Industrial Sensors
Serviceline Explosion Protection

Surge Protection Barrier M-LB-2.255.T3.D

  • Surge protection for 2 supply lines
  • Type 3 acc. to EN 61643-11
  • Nominal voltage 230 V AC
  • Pre-wired unit
  • Operating state and fault indication of every protected line
  • Fault indication output
  • DIN rail mountable

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-2.255.T3.D

General specifications
Device typetype 3 acc. to EN 61643-11:2013
class III acc. to IEC 61643-1:2011
Number of protected supply lines2
Suitable componentsprotection module M-LB-2.255.T3.M
Electrical specifications
Nominal voltage230 V AC, 50 ... 60 Hz
Maximum continuous operating voltage255 V AC, 50 ... 60 Hz
255 V DC
Temporary over-voltage335 V/5 s (TOV withstand) (L-N)
400 V/5 s (TOV withstand) (L/N-PE)
1200 V+Ucs/200 ms (TOV safe failure) (L+N-PE) 5 s (TOV withstand)
Nominal discharge current (8/20 µs)3 kA
Max. surge current (8/20 µs)5 kA
Voltage protection levelmax. 1.25 kV (L-N)
max. 1.5 kV (L/N-PE)
Reaction timemax. 25 ns (L-N)
max. 100 ns (L/N-PE)
Short-circuit-proof6 kA eff at max. mains-side overcurrent protection
Overcurrent protectionmax. 25 A gL/gG (B 25 A) , mains-side
Fault indication output
Connectionterminals 11, 12, 14
Outputvolt-free change-over contact
Switch powerAC: 250 V / 0.5 A
DC: 250 V/0.1 A; 125 V/0.2 A; 75 V/0.5 A; 24 V/0.5 A
Display elementsstatus display
operating state (green)
fault indication (red)
Directive conformity
Low voltage
Directive 2014/35/EUEN 61643-11:2012
Degree of protectionIEC 60529:2013
Shock resistanceEN 60068-2:2010
Vibration resistanceEN 60068-2:2010
Operating conditions
Installation conditions
Mounting locationindoor
Ambient conditions
Ambient temperature-40 ... 80 °C (-40 ... 176 °F)
Relative humidity5 ... 95 %
Mechanical specifications
Degree of protectionIP20
Core cross-section- min. 0.5 mm2 solid/flexible
- max. 4 mm2 stranded/2.5 mm2 flexible
Housingthermoplastic, color grey , UL 94 V-0
Massapprox. 120 g
Dimensions18 x 90 x 73 mm (0.7 x 3.6 x 2.9 inch) (1 TE acc. to DIN 43880)
Mountingon 35 mm DIN mounting rail acc. to EN 60715:2001
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
UNSPSC 12.139121610

Documents: M-LB-2.255.T3.D

BrochuresLanguageFile TypeFile Size
Product Information Surge ProtectionENGPDF447 KB
Produktübersicht Surge Protection GERPDF449 KB
Instruction leaflets
Mounting instructions / MontageanleitungALLPDF528 KB

Approvals+Certificates: M-LB-2.255.T3.D

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-2133APDF50 KB
Canada UL Surge Protective Device cULE346845 cUL (VZCA8)LINK---
Europe DEKRA Surge Protective DeviceKEMA 2172593.02PDF234 KB
USA UL Surge Protective Device ULE346845 UL (VZCA2)LINK---

Function: M-LB-2.255.T3.D

This device is a modular surge protection barrier (type 3 acc. to EN 61643-11) with error message output (floating changeover contact).

The complete device consists of a base module and plug-in protection modules and is ready for installation.

The base part offers multifunctional terminals for connection of conductors and busbars.

Every protection module is locked in the base module and can be changed without tools via release buttons.