Product Introduction
The Allen-Bradley 1746-OA8 is a discrete AC output module from the SLC 500 series. With eight output channels arranged in two groups of four, this module handles general-purpose switching applications with a wide output voltage range of 85–264 VAC. It consumes only 185 mA from the 5 VDC backplane, making it an energy-efficient choice for your control system.
Technical Specifications
| Parameter |
Value |
| Output Voltage Range |
85–264 VAC |
| Nominal Output Voltage |
120 / 240 VAC |
| Frequency |
47–63 Hz |
| Number of Outputs |
8 |
| Groups / Channels per Group |
2 / 4 |
| Backplane Current (5 VDC) |
185 mA |
| Continuous Current per Point (at 30°C) |
1.0 A |
| Continuous Current per Point (at 60°C) |
0.5 A |
| Continuous Current per Module (at 30°C) |
8.0 A |
| Continuous Current per Module (at 60°C) |
4.0 A |
| On‑State Voltage Drop |
1.5 V max at 1.0 A |
| Surge Current per Point |
10 A for 25 ms |
| ON Delay (Resistive Load) |
1 ms max |
| OFF Delay (Resistive Load) |
11 ms max |
| Step Response |
60 ms in, 2.5 ms out |
Industry Applications
The 1746-OA8 is ideal for on/off control of AC loads such as motors, solenoids, and pilot lamps in manufacturing and process automation. Its derating curve ensures reliable operation even in elevated ambient temperatures up to 60°C, reducing the risk of thermal failure and extending module lifespan. This translates to lower total cost of ownership and minimized downtime.
Installation & Setup Guidance
When installing the Allen-Bradley 1746-OA8, ensure the SLC 500 chassis is powered off. Insert the module into an available slot and secure it with the locking screws. Wire your AC loads to the terminal block, respecting group isolation – each group of four channels shares a common. Use proper fuse protection per point (recommended 1 A fast‑acting) to safeguard against overcurrent. Observe polarity: the module outputs are AC, so polarity is not critical, but always follow local electrical codes.
Selection Guide & Purchasing Advice
Before purchasing, verify your SLC 500 chassis compatibility and available backplane current. The 1746-OA8 draws 185 mA at 5 VDC, which must be within your power supply capacity. For applications requiring higher current per point or modules with isolation per channel, consider the 1746-OA16 or 1746-OVP16. For a reliable source of genuine Allen-Bradley 1746-OA8 modules, visit UBEST Automation (ubest101) – your trusted partner for industrial automation spares.