Overview
The Allen-Bradley 1746-OW4 is a compact 4-channel digital contact output module engineered for the SLC 500 modular controller platform. This relay contact output module provides normally open (N.O.) relay contacts rated for both AC and DC loads, making it suitable for a wide range of industrial automation and motor control applications requiring relay switching capability.
Key Features
- Four (4) normally open relay contact outputs for flexible switching control
- Dual voltage support: 5–265V AC or 5–125V DC operating range
- Compact form factor integrates seamlessly into existing SLC 500 chassis
- Removable terminal block for quick field installation and maintenance
- Optical isolation and surge suppression for noise immunity in industrial environments
Technical Specifications
- Output Type: Digital contact relay (4 × N.O.)
- Operating Voltage Range: 5–265V AC or 5–125V DC
- Current Rating: 1.5A per output @ 120V AC; 1.2A per output @ 24V DC
- Maximum Module Current: 8A continuous
- Signal Delay: 10 ms ON/OFF
- Backplane Current: 0.045A @ 5V DC or 24V DC
- Thermal Dissipation: 1.9W maximum; 0.133W per point
- Minimum Load Current: 1 mA @ 5V DC
- Terminal Type: Removable terminal block (RTB)
- Certifications: UL 508, CSA 22.2 No. 142, Class 1 Division 2
- Series: SLC 500 Modular I/O
Typical Applications
The 1746-OW4 is widely used in:
- Motor starter control and pump relay switching
- Solenoid and actuator control circuits
- Alarm and warning signal actuation
- HVAC and process equipment switching
- Industrial machinery interlocks and safety circuits
Compatibility & Replacements
The 1746-OW4 is compatible with all SLC 500 modular chassis (1746-A2, A4, A10, A13) and integrates with RSLogix 500 programming software. It may be replaced by or paired with the 1746-OW16 (16-point version) or the 1746-IO4 (combination 4-input/4-output module) depending on your application requirements. Consult your system documentation or contact your distributor to confirm compatibility with legacy SLC 500 systems. Always refer to the SLC 500 Modular Hardware Style User Manual (Publication 1747-UM011) for detailed wiring, installation, and surge suppression guidance.
