Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1734-OW4 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | 4-Channel Digital Contact Output Module |
| System | POINT I/O |
| Number of Channels | 4 |
| Output Type | Normally Open (Form A) Relay Contact |
| Rated Load Voltage | 240V AC / 125V DC |
| Rated Load Current | 2A per channel (resistive) |
| Maximum Switching Power | 500 VA (AC) / 60W (DC) |
| Contact Isolation | 1500V AC (channel-to-backplane) |
| Initial Contact Resistance | <100 mΩ |
| Expected Mechanical Life | 20 million operations (no load) |
| Expected Electrical Life | 100,000 operations (rated load) |
| Operating Temperature | -20°C to +55°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Dimensions (W×H×D) | 12.2 mm × 76.2 mm × 65.5 mm |
| Weight | Approx. 65 g |
| Mounting | DIN 35 rail (EN 60715) |
| Connection Type | Screwless spring clamp terminals |
| Wire Size | 0.2–2.5 mm² (24–12 AWG) |
| Power Consumption | 55 mA from 5V backplane supply |
| Ingress Protection | IP20 (enclosed cabinet use) |
Main Features and Advantages
The Allen-Bradley 1734-OW4 delivers genuine relay contact switching in an ultra-compact POINT I/O form factor, providing a level of electrical isolation that solid-state outputs simply cannot match. Each of the four channels uses a physically separating relay contact, creating a galvanic barrier between the control system backplane and the load circuit. With 1500V AC isolation from channel to backplane, the Allen-Bradley 1734-OW4 safely contains voltage transients, inductive kickback, and ground potential differences that would otherwise propagate into the controller and adjacent I/O modules. This isolation is the module’s defining advantage and the reason it is consistently specified for interfacing with legacy equipment, mixed-voltage systems, and loads with unpredictable electrical behavior.
The relay contact design also eliminates the voltage drop and heat generation associated with transistor outputs, allowing the Allen-Bradley 1734-OW4 to switch both AC and DC loads across a broad voltage range without derating. At 240V AC and 125V DC with 2A per channel, the module handles contactor coils, solenoid valves, pilot lights, and small motor starters directly—loads that would require external interposing relays with a standard 24V DC transistor output module. The 500 VA AC switching power rating provides a comfortable margin for inductive loads, while the <100 mΩ initial contact resistance ensures minimal power loss and heat generation at the contact interface.
Diagnostic capability is built into every channel of the Allen-Bradley 1734-OW4. The module reports individual channel status to the controller, including open circuit detection that identifies blown fuses or disconnected loads without requiring a technician to physically inspect the wiring. This level of visibility dramatically reduces mean time to repair in distributed installations where I/O points may be hundreds of meters from the control room. Combined with the 20 million operation mechanical life rating, the Allen-Bradley 1734-OW4 is engineered for long service intervals and reliable performance in continuous operation environments.
