Overview
The Cutler-Hammer E51RA is a surface-mount photoelectric limit switch receptacle designed for the E51 modular sensor series. This 2-wire receptacle operates at 20-264V AC/DC with 1 NO or 1 NC contact, front or rear mounting, and a gray die-cast housing body. The receptacle features a 1/2" NPT conduit entrance and is rated for harsh industrial environments.
Key Features
- NEMA Rating 3, 3S, 4, 4X, 6, 6P, 12, 13 for indoor/outdoor and corrosive applications
- 2-Wire configuration with selectable NO/NC logic
- Terminal wiring with 1/2″ NPT thread at conduit entrance
- Gray die-cast housing for durability
- Front or rear mounting flexibility
- Compact modular design integrates with E51 photoelectric sensor heads
Technical Specifications
- Voltage: 20-264V AC/DC
- Wiring: 2-Wire
- Output Contacts: 1 NO or 1 NC
- Housing: Die-cast, gray
- Mounting: Front or Rear
- Conduit Entrance: 1/2" NPT
- NEMA Ratings: 3, 3S, 4, 4X, 6, 6P, 12, 13
- Series: E51 Modular Limit Switch Style
Typical Applications
- Conveyor line position sensing and control
- Gate or door safety limit monitoring
- Industrial equipment presence detection
- Pressure switch receptacle replacement in manufacturing facilities
- Machinery overtravel protection circuits
- Automation and process control systems requiring modular sensor interfaces
Compatibility & Replacements
Compatible With
- E51 modular limit switch style sensors
- Sensor body E51SAL with operator heads E51DP1, E51DP2, or E51DC1
- Standard industrial control circuits rated 20-264V AC/DC
- PLC inputs and relay coil circuits with 2-wire NO/NC logic
Replaces / Drop-In Replacement For
- Original Cutler Hammer E51RA units
- Equivalent E51 series photoelectric receptacles
- Legacy Eaton limit switch receptacle modules compatible with Series A1 sensor designs
Works With
- AC sources (use E51RA for AC or E51RN for DC)
- PLC discrete input modules accepting 2-wire sensor signals
- Industrial automation controllers with standard 24V-264V input cards
- Hardwired relay logic and control circuits
