KEYENCE PR-M51N3 Photoelectric Sensor
The KEYENCE PR-M51N3 is a high-performance, compact reflective photoelectric sensor engineered for reliable object detection in space-constrained industrial environments. Featuring a heavy-duty metal housing, this miniature sensor provides superior durability and impact resistance compared to standard plastic alternatives. It is designed with a pre-wired cable connection featuring exposed leads, allowing for seamless and flexible integration into various control systems. The sensor also includes conveniently placed mounting holes for quick and secure installation. Fully compliant with CE standards, the PR-M51N3 is an excellent choice for demanding automation, packaging, and manufacturing applications where precision and ruggedness are essential.
Technical Specifications:
- Brand: KEYENCE
- Model: PR-M51N3
- Sensor Type: Compact Reflective Photoelectric Sensor
- Housing Material: Metal
- Output Type: NPN
- Connection Method: Pre-wired cable with exposed leads
- Certifications: CE Compliant

| Brand | KEYENCE |
|---|---|
| Model | PR-M51N3 |
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Shipping policy
If you are buying multiple items, please contact us before checking out so we can get you the best combined rate for shipping.
Our default shipping rate is $100, which is enough to cover the cost of most shipments, but it is not our expected shipping rate. Due to the varying weights and sizes of products and customer locations, please contact us with your location and the products you are interested in to get the best current shipping rates.
ENERAL DELIVERY INFORMATION
Orders will be processed and shipping during standard working hours (0830 – 1700 GMT+8) Monday to Friday (excluding Bank Holidays)
On rare occasions, your order may be handled and/or processed on a Saturday. However, we are unable to ship items on weekends, therefore any orders dealt with on the weekend will be send out the next following working day.
The cut-off point for orders to be shipped the same day is 14:00 – please contact us to confirm stock levels before placing your order
Any orders placed after the cut-off will ship the next working day assuming all parts are in stock and ready for dispatch.
All orders:
- must be paid for in full before any goods are dispatched
- require a signature upon delivery. Please ensure delivery can be made to an address where someone will be available to sign for the delivery
- are packaged with great care, ensuring your order and the contents it contains, makes it safely through the delivery network
KEYENCE PR-M51N3 Photoelectric Sensor
Optimize your automation system with the KEYENCE PR-M51N3 miniature reflective photoelectric sensor. Featuring a rugged metal housing, NPN output, and pre-wired cable, it delivers highly reliable, space-saving detection for industrial applications.

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