Serviceline Information

A Level Higher: Inductive Sensors of the 2nd Generation
Use our VariKont® Finder Tool to easily find your successor ...

  • 20 mm flush
  • 4-wire DC
  • 4 LEDs indicator for 360° visibility

Datasheet as PDF in following languages:


Technical Data: NBB20-U1-A2

General specifications
Switching element functionPNP NO/NC
Rated operating distance20 mm
Installationflush
Output polarityDC
Assured operating distance0 ... 16.2 mm
Reduction factor rAl 0.33
Reduction factor rCu 0.31
Reduction factor r304 0.74
Reduction factor rBrass 0.38
Nominal ratings
Operating voltage10 ... 30 V DC
Switching frequency0 ... 150 Hz
Hysteresistyp. 5 %
Reverse polarity protectionreverse polarity protected
Short-circuit protectionpulsing
Voltage drop≤ 2 V
Operating current0 ... 200 mA
Off-state current0 ... 0.5 mA
No-load supply current≤ 20 mA
Operating voltage displayLED, green
Switching state indicationLED, yellow
Functional safety related parameters
MTTFd1230 a
Mission Time (TM)20 a
Diagnostic Coverage (DC)0 %
Approvals and certificates
UL approvalcULus Listed, General Purpose
CSA approvalcCSAus Listed, General Purpose
CCC approvalCCC approval / marking not required for products rated ≤36 V
Ambient conditions
Ambient temperature-25 ... 85 °C (-13 ... 185 °F)
Storage temperature-40 ... 85 °C (-40 ... 185 °F)
Mechanical specifications
Connection typescrew terminals
Core cross-sectionmax. 2.5 mm2
Housing materialPA/metal with epoxy powder coating
Sensing facePA
Housing diameter
Protection degreeIP68 / IP69K
Mass225 g
NoteTightening torque: 1.8 Nm (housing)
Tightening torque: 1.0 Nm (Screw terminal)

Documents: NBB20-U1-A2

Product informationLanguageFile TypeFile Size
Product information A level higher - The new VariKontENGPDF1214 KB
Produktinformation A level higher - Der neue VariKontGERPDF1565 KB
Technical information
Installation conditionsENGPDF209 KB
EinbaubedingungenGERPDF203 KB

CAD+CAE: NBB20-U1-A2

CADFile TypeFile Size
3D Modell/3D modelIGS2629 KB
3D Modell/3D modelSTP2003 KB

Approvals+Certificates: NBB20-U1-A2

CertificatesCertificate No.File TypeFile Size
US CA UL General PurposeE87056LINK---
Europe Pepperl+Fuchs 2004/108/EC (EMC) Declaration of ConformityPF 08 CERT 1262PDF357 KB
US CA CSA1007121 (LR96321-2)PDF101 KB

Associated Products: NBB20-U1-A2

AccessoriesName
V1-M20-80Receptacles
MHW 01Mounting aid
MH 04-2681FMounting aid