Serviceline Industrial Sensors
Serviceline Explosion Protection

FO Splice Boxes in Stainless Steel with Return Flange SR.TFO.*

  • Safe protection of fiber optic cable splices in hazardous areas
  • Installation in Zone 1, Zone 2, Zone 21 and Zone 22
  • Ex op pr and Ex tb certified
  • Stainless Steel enclosure
  • Up to 8 splice trays, 12 fusion-type splices per tray
  • Wide range of cable glands and stopping plugs
  • Return Flange Sealing provides Drain Channel

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  SR.TFO.*

Product Description
FO Splice Boxes in Stainless Steel with Return Flange
Mechanical specifications
Enclosure coverfully detachable
Cover fixingstainless steel A4 (V4A) hexagonal head screws
Tightening torque3 Nm - 3.5 Nm
Cover sealsilicone
Degree of protectionIP66
Cable entrythru-holes direct through body
Gland plate on face(s)optional
Enclosure1.5 mm AISI 316L, (1.4404) stainless steel
Gland plateoptional 3 mm or 6 mm AISI 316L (1.4404) stainless steel
Masssee data table
Dimensionssee data table
Mounting4 Mounting bracket for wall mounting included in the scope of delivery
GroundingM6 internal/external brass nickel-plated grounding bolt
M6 internal stainless steel grounding bolt welded to lid
M6 internal stainless steel grounding bolt welded to enclosure body
Fiber optic splice tray
Numbersee data table
Dimensions142 mm x 92 mm x 8 mm
Quantity of splice connections per tray12
Type of splicesfusion with 60 mm heatshrink protectors
Fiber optic splicing protection holders per tray2 for heatshrink splice protectors 60 mm, 6 splices each
Fiber optic strain relief per trayoptional 2 each for 12 fibers with 0.9 mm or 1.1 mm insulation
Fiber optic cables min. bending radius35 mm
Fiber optic cables frequency range10 ... 10000 MHz
StandardsDIN 47662 and Telecom standards
Ambient conditions
Ambient temperature-40 ... 55 °C (-40 ... 131 °F)
-50 °C (-58 °F) on request
Data for application in connection with hazardous areas
EU-type examination certificateCML 20 ATEX 3156X
MarkingEx-Hexagon II 2 GD
Ex op pr IIC T* Gb
Ex tb IIIC T** °C Db
T5/T95 °C @ Ta +55 °C
T6/T80 °C @ Ta +40 °C
International approvals
IECEx approvalIECEx CML 20.0094X
IECEx BAS 14.0169U
UKCA approvalCML 21 UKEX 3892X
Further approvalsfurther on request
Degree of protectionEN60529
CE marking0102
UKCA marking2503
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


ECLASS 11.027180502
ECLASS 10.0.127180502
ECLASS 9.027180502
ECLASS 8.027180502
ECLASS 5.127180502
ETIM 8.0EC002503
ETIM 7.0EC002503
ETIM 6.0EC002503
ETIM 5.0EC002713
UNSPSC 12.139121314

Details: SR.TFO.*


The SR.TFO.* series is a range of fiber optic splice boxes designed for protection of optical fiber cable splices in hazardous areas. Up to 8 splice trays are installed inside the sturdy stainless steel enclosure.

The splice trays are according to DIN 47662 and Telecom standards, each tray can hold up to 12 fusion-type splices and can be optionally equipped with strain reliefs as required.

The enclosures are manufactured from brushed AISI 316L stainless steel which provides excellent tarnish and corrosion resistance. All enclosures feature a 45° return flange sealing method which channels water away from the seal area and also prevents accumulated dirt and dust from entering the enclosure when the cover is opened.

Durable materials allow the splice box to be used in ambient temperatures between -50 °C and +55 °C.

Fiber optic splice boxes are available in further enclosure materials such as GRP.

Product Documentation: SR.TFO.*

Language Selection:
Brief InstructionsLanguageFile TypeFile Size
Brief Instructions Fiber Optic Splice BoxENGPDF310 KB
Brief Instructions Terminal Boxes Series SR.TJ* and SR.TB*ENGPDF335 KB

Approvals: SR.TFO.*

Language Selection:
CertificatesCertificate No.LanguageFile TypeFile Size
ATEX CertificateCML 20ATEX3156XALLPDF127 KB
IECEx Certificate of ConformityIECEx CML 20.0094XALLLINK---
Sira ATEXBaseefa 14 ATEX 0368UALLPDF2467 KB
Sira IECEx Certificate of ConformityIECEx BAS 14.0169UALLLINK---
UK-Type Examination CertificateCML 21UKEX3892XALLPDF219 KB
Declaration of Conformity
UK Declaration of Conformity (P+F) / UK-Konformitäterklärung (P+F)DOC-6982ALLPDF255 KB
SR Series—Stainless Steel Enclosures for Hazardous Areas

The new SR enclosure series made of stainless steel impresses with its modular concept: Discover the range of enclosures that perfectly solves every application—at every level …

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