Select your location

Serial Number Verified :
The product is verified as being authentic; however, this does not guarantee the condition or fit for purpose of the product.

E51 NEMA limit switch photoelectric sensors

Built sensor tough

Eaton's E51 limit switch style modular sensors are available in thru-beam, reflex, polarized reflex, diffuse reflective and fiber optic sensing modes to solve a wide variety of sensing applications. Modular, plug-in components are easy to maintain, meaning less downtime and reduced inventory. Choose between 2-wire sensors with AC/DC operation and 4-wire sensors in either AC or DC styles. Connection options include terminal, mini-connector and various lengths of cable. Sensors can be ordered in component form or as fully assembled units.  

Core features for the E51 NEMA limit switch photoelectric sensors

  • Choose from five different sensing modes including fiber optic   
  • All heads feature a selector switch for light or dark operation   
  • Logic modules are available to provide additional control functions   
  • Rugged construction, ideal for industrial environments   
  • Viton gaskets ensure a positive seal and high chemical resistance   
  • Sensor heads can be rotated to any of four positions  
  • Components are interchangeable with E51 proximity sensors   
  • Sensors accommodate both U.S. and DIN mounting dimensions   
  • Sensor bodies feature bifurcated engagement prongs for a reliable electrical connection when plugging into receptacle stabs  

Test the Best!

Not sure if Eaton sensor and limit switch solutions are right for you? You can request samples of Eaton sensors FREE OF CHARGE to test them with your machine applications. We will make our Eaton experts available to assist with product selection and provide technical guidance so that you choose the right sensor for your needs.

Ready to order?

Use our LOCATE A DISTRIBUTOR tool to find one near you.
How to buy from Eaton
Locate a distributor

Contact your Local Distributor for pricing, availability, ordering, expediting, and repairs.

Technical support

Available for FREE. Contact an EatonCare representative between the hours of 8AM to 5PM EST at 877-ETN-CARE or 877-386-2273 and select OPTION 2. Send an email to