The Pepperl+Fuchs NBB20-U1-A0-M is a high-precision inductive proximity sensor designed for reliable non-contact detection of metal objects in industrial automation. With a 20 mm rated operating distance (flush mounting), it ensures accurate positioning in compact setups, supported by a bidirectional, rotatable sensor head for flexible alignment. The 4-wire DC NPN output offers both normally open (NO) and normally closed (NC) switching functionality, operating seamlessly across a 10–30 V DC voltage range with reverse polarity and pulsing short-circuit protection. A 400 Hz switching frequency and 5% hysteresis minimize signal fluctuations, while two 360° visible LEDs—green for power and yellow for switching state—enable quick diagnostics. Ideal for high-speed applications like conveyor systems and robotic positioning, its screw terminal connections simplify integration into control systems, balancing precision with operational stability.
Engineered to withstand demanding conditions, the NBB20-U1-A0-M features a durable PA/metal housing with an epoxy powder coating, resisting corrosion, impact, and vibration. Its IP67 protection rating ensures reliable performance in dusty, wet, or high-pressure washdown environments, while a wide -25°C to +85°C ambient temperature range (storage: -40°C to +85°C) adapts to extreme industrial climates. The sensor’s compact design (118 mm × 40 mm × 40 mm, 225 g) and flush-mountable structure with screw terminals (supporting up to 2.5 mm² conductors) facilitate easy installation in space-constrained or vibration-prone machinery. Metal reduction factors (aluminum: 0.33, copper: 0.31, stainless steel 304: 0.74) enable versatile detection across different materials, enhancing its adaptability in diverse industrial settings.
Designed for global industrial use, the NBB20-U1-A0-M complies with EN IEC 60947-5-2 safety standards and carries certifications like cULus listing and RoHS compliance, with CCC exemption for ≤36 V DC applications. Its functional safety parameters include an MTTFd of 1,289 years and a 20-year mission time, ensuring long-term reliability in non-safety-integrated systems. The sensor’s robust electrical design, including overload protection and low voltage drop (≤2 V), supports stable operation in complex automation networks. Suitable for applications in automotive manufacturing, logistics, and food processing, its combination of precision sensing, rugged construction, and international approvals makes it a trusted choice for critical industrial tasks requiring consistent performance and durability.
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Attribute
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Details
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General Information
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Product Type
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Inductive Proximity Sensor
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Model
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NBB20-U1-A0-M
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Manufacturer
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Pepperl+Fuchs
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Sensing Characteristics
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Rated Operating Distance
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20 mm (flush mounting)
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Assured Operating Distance
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0–16.2 mm (guaranteed reliable detection range)
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Metal Reduction Factors
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Aluminum (0.33), Copper (0.31), Stainless Steel 304 (0.74)
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Switching Function
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Normally Open (NO)
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Electrical Parameters
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Supply Voltage
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10–30 V DC
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Output Type
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3-wire DC NPN (sinking)
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Nominal Operating Current
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0–200 mA
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Off-State Current
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≤ 0.5 mA (typical 0.1 μA at 25°C)
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No-Load Supply Current
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≤ 20 mA
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Voltage Drop
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≤ 2 V
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Switching Frequency
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0–440 Hz (high-speed operation)
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Hysteresis
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Approx. 5% (minimizes signal oscillations)
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Electrical Protection
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Reverse polarity protection; pulsing short-circuit protection; overload protection
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Indicators
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LEDs
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4 x 360° visible LEDs: Green (power status), Yellow (switching state)
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Mechanical Design
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Housing Material
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PA (polyamide) with metal base and epoxy powder coating (corrosion/impact resistance)
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Sensing Face Material
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Polyamide (PA)
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Dimensions
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118 mm (L) × 40 mm (W) × 40 mm (H)
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Weight
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225 g
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Mounting
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Flush-mountable with bidirectional/rotatable sensor head
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Connection
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Screw terminals (supports 0.5–2.5 mm² conductors, 1.2 Nm tightening torque)
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Environmental Ratings
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IP Rating
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IP67 (dust-tight and protected against temporary water immersion)
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Operating Temperature Range
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-25°C to +85°C (ambient); -40°C to +85°C (storage)
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Certifications & Approvals
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Standards
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EN IEC 60947-5-2 (industrial switchgear safety), RoHS compliant
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Approvals
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cULus listed (USA/Canada), CCC exempt (≤36 V DC)
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Functional Safety
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MTTFd (Mean Time To Failure)
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1,289 years (estimated reliability for non-safety-integrated systems)
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Mission Time (Tm)
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20 years
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Diagnostic Coverage (DC)
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0%
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Applications
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Industrial automation, conveyor systems, robotic positioning, automotive manufacturing, and harsh environments requiring dust/water resistance (e.g., metalworking, logistics, food processing)
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Product Tags:
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Pepperl+Fuchs NBB20-U1-A0-M Inductive Sensor | 20mm, 10-30V DC, IP67, M30, PNP NC | Machine Safety Images
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