Product Overview
Industrial control panels have evolved from relay banks to compact solid-state systems, and the Allen-Bradley 1762-OA8 sits right at that shift. This solid-state output module from Rockwell Automation gives MicroLogix controllers eight AC triac outputs in a slim footprint. It replaces mechanical relay wear with silent, arc-free switching. For plants running legacy MicroLogix 1100, 1200, or 1400 systems, the 1762-OA8 keeps those panels productive without a full control overhaul.
Technical Specifications
The 1762-OA8 runs on 100 to 240 Volts AC input power and switches loads across an operating voltage range of 85 to 265 Volts AC. Its operating frequency spans 47 to 63 Hertz, covering standard industrial mains worldwide. Eight AC triac outputs handle the field devices, split across 2 commons. Maximum bus current draw is 115 mA at 5 Volts DC, and heat dissipation tops out at 2.9 Watts. The module measures 3.54 x 1.59 x 3.43 inches and weighs 0.5 pounds.
| Specification | Value |
|---|---|
| Function | Solid-State Output Module |
| Outputs | 8 AC Triac |
| Input Power | 100 to 240 Volts AC |
| Operating Voltage | 85 to 265 Volts AC |
| Operating Frequency | 47 to 63 Hertz |
| Commons | 2 |
| Max Bus Current | 115 mA at 5 Volts DC |
| Heat Dissipation | 2.9 Watts |
| Max Voltage Drop | 1.5 Volts at 0.5 Amps |
| Min On-State Current | 10 mA |
| Dimensions (HxWxD) | 3.54 x 1.59 x 3.43 inches |
| Shipping Weight | 0.5 pounds |
Two specs matter most in practice. The 10 mA minimum on-state current means very light loads may not switch cleanly, so verify your field devices draw enough current. The 1.5 Volt drop at 0.5 Amps is typical for triac outputs and should be factored into voltage budgets for sensitive loads.
Where the 1762-OA8 Fits
This module suits panels driving AC solenoids, contactors, indicator lamps, and small motor starters. In oil and gas skids, it switches valve actuators and pump controls where relay contacts would pit and fail. In water treatment, it handles pump and blower interlocks across wide voltage swings. Food processing lines benefit from the silent, arc-free triac switching near washdown areas. Because the 1762-OA8 accepts 85 to 265 Volts AC, one spare covers multiple plant voltages.
Installation and Setup
Mount the 1762-OA8 on a properly grounded metal panel. Allen-Bradley wiring and grounding guidelines apply. Before applying power, clear the module of all metal fragments — loose debris can damage the unit once energized. Keep the finger-safe cover in place while wiring the terminal block; once removed, the cover cannot be reinstalled because the wires block it. Confirm your MicroLogix 1100, 1200, or 1400 chassis has an open slot and that the 5 Volt DC bus can supply the 115 mA draw.
Reliability and Maintenance
Solid-state triacs have no moving contacts, so the 1762-OA8 avoids the mechanical wear that shortens relay module life. Operating temperature spans 32 to 131 degrees Fahrenheit; non-operating temperature spans -40 to 185 degrees Fahrenheit. Inspect terminal connections periodically and keep the panel free of conductive debris. The module complies with NEMA ICS 2-230, EN50081-2 Class A, IEC1000-4-2, and IEC1000-4-3 standards. Please verify current lifecycle status and availability with Oil AutoTech before ordering.
FAQ
Q: How many outputs does the 1762-OA8 provide?
A: Eight AC triac outputs, arranged across 2 commons.
Q: What voltage range does the 1762-OA8 accept?
A: It operates on 85 to 265 Volts AC at 47 to 63 Hertz, with input power of 100 to 240 Volts AC.
Q: Which controllers work with this module?
A: It is compatible with MicroLogix 1100, MicroLogix 1200, and MicroLogix 1400 systems.
Q: What is the minimum load current?
A: The minimum on-state current is 10 mA; lighter loads may not switch reliably.
Q: How much heat does it dissipate?
A: Maximum heat dissipation is 2.9 Watts, with maximum bus current of 115 mA at 5 Volts DC.
