Overview
The Eaton E51CLP4 is a photoelectric sensor switch body designed for the E51 modular limit switch platform. This 40-inch diffuse reflective sensor delivers dependable detection in a compact rectangular housing with screw terminal connection. The E51CLP4 operates on 4-wire AC power and is certified to UL and CSA standards, making it ideal for NEMA-rated industrial automation and motion control systems that require reliable dark and light sensing.
Key Features
- 40-inch diffuse reflective sensing range for object detection
- 4-wire AC operation with dual N.O./N.C. contact outputs (L1 switched)
- Rectangular die-cast zinc body with screw terminal connections
- Modular design for easy maintenance and reduced downtime
- UL listed and CSA certified for machinery control environments
- Plug-in compatibility with E51 modular sensor ecosystem
Technical Specifications
- Manufacturer: Eaton Cutler-Hammer
- Model: E51CLP4
- Sensor Type: Photoelectric, diffuse reflective
- Sensing Range: 40 inches
- Power Supply: 4-wire AC
- Contact Configuration: N.O. and N.C. (L1 switched)
- Connection: Screw terminals
- Housing Material: Die-cast zinc
- Body Style: Rectangular
- Certifications: UL listed, CSA certified
- Series: E51
Typical Applications
The E51CLP4 is suited for a wide range of industrial detection applications:
- Conveyor belt object detection and tracking
- Part presence verification and counting
- Container or package detection on production lines
- Automated machinery limit switching and position sensing
- Material handling and assembly equipment control
- NEMA enclosure-mounted sensing solutions
Compatibility & Replacements
Compatible With
- E51 modular limit switch sensor platform and assemblies
- Eaton industrial automation control systems
- NEMA 3, 3S, 4, 4X, 6, 6P, 12, 13 enclosures
- Standard 24 VAC/VDC control circuits with external power supply
- Standard industrial machinery control circuits and PLC inputs
Replaces / Drop-In Replacement For
Verify with your system integrator or controls engineer for exact replacement compatibility before ordering.
Works With
- Allen-Bradley, Siemens, Mitsubishi, Omron, and other major PLC platforms
- Industrial control relays and contactor circuits
- Standard voltage-free relay contact wiring
- NEMA-rated machinery control environments




















