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Allen Bradley 871L-D20EP40-D4 Inductive Proximity Sensor

Allen Bradley 871L-D20EP40-D4 20mm inductive proximity sensor.

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ManufacturerAllen Bradley

Part number871L-D20EP40-D4

Sensing Range 20 mm

Output NPN

Function Normally Closed (NC)

Circuit Type DC 3-wire

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12-month warranty

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Veteran-owned

CAGE: 9NK75

20mm sensing range NPN Normally Closed output Stainless steel housing Micro QD connector LED output indicator High reliability

Product description

The Allen Bradley 871L-D20EP40-D4 is a 20mm cylindrical inductive proximity sensor designed for detecting metallic objects. It features a 20mm sensing range and operates on a DC 3-wire normally closed (NC) circuit, providing a reliable NPN output. The sensor is housed in a durable stainless steel casing with a PBT plastic sensing face.

This sensor is commonly used in industrial automation for position sensing, counting, and presence detection in applications such as material handling, packaging machinery, and assembly lines. Its robust construction makes it suitable for harsh environments across various industries including automotive, food and beverage, and general manufacturing.

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Technical specifications

Sensing Range	20 mm
Output	NPN
Function	Normally Closed (NC)
Circuit Type	DC 3-wire
Housing Style	Cylindrical
Body Diameter	20 mm
Housing Material	Stainless Steel
Face Material	PBT Plastic
Output Indicator	LED
Connection Type	Micro QD (M12 connector)

Common applications

Machine guarding

Conveyor systems

Robotics

Packaging machinery

Assembly lines

Automotive manufacturing

Material handling

Compatible systems

Allen Bradley ControlLogix Allen Bradley CompactLogix SLC 500 series PLCs

Also known as

871L-D20EP40D4 Allen Bradley 871L proximity switch 20mm DC NC sensor

Replaces / compatible with

This sensor is part of the Allen Bradley 871L series and is designed for direct replacement or as an upgrade for similar sensors in automated systems.

Technical note

Expert tip

Ensure proper mating of the Micro QD connector to prevent moisture ingress, especially in washdown applications.

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Frequently asked questions

What is the output type of the Allen Bradley 871L-D20EP40-D4 proximity sensor?

The Allen Bradley 871L-D20EP40-D4 features an NPN output operating in a Normally Closed (NC) configuration. It is a DC 3-wire sensor, commonly used for detecting metallic targets in industrial automation.