Allen-Bradley 1794-OW8XT FLEX I/O 8-Point Relay Output Module

2026-04-21T00:04:19-07:00

Type: Relay Output Module
Price: 66.00

Product Overview

The Allen-Bradley 1794-OW8XT functions as a ruggedized 8-channel relay output module within the FLEX I/O platform. This module provides isolated dry-contact outputs capable of switching both AC and DC loads up to 250V AC. The "XT" designation identifies this hardware as an extended-temperature version, specifically designed to withstand harsh industrial environments that exceed the thermal limits of standard control equipment. We supply this module in 100% Brand New condition, ensuring pristine contact surfaces and maximum mechanical life for your distributed I/O network.

Technical Specifications

Module Type: Discrete Relay Output

Number of Outputs: 8 Normally Open (N.O.) Relays

Relay Contact Rating: 250V AC

Minimum Contact Load: 100 µA @ 100 mV DC

Initial Contact Resistance: 30 mΩ

Bounce Time: 1.2 ms

Switching Frequency: 1 operation every 3 seconds (max at rated load)

Flexbus Current: 5V DC

Power Dissipation: 5.5 Watts

Thermal Dissipation: 18.8 BTU/hr maximum

Weight: 0.31 lbs (0.14 kg)

Engineering Advantages

The 1794-OW8XT resolves specific field-level integration challenges through its specialized relay architecture and hardened design:

Extreme Thermal Resilience: The XT hardware profile maintains reliable switching performance across a significantly wider temperature range than standard modules. This eliminates the need for expensive climate-control systems in remote cabinets or outdoor enclosures.

Low-Level Signal Switching: With a minimum contact load requirement of just 100 µA at 100 mV DC, this module accurately switches low-energy signals. This capability proves vital when interfacing with high-impedance electronic inputs or sensitive instrumentation that traditional power relays cannot handle.

Superior Load Isolation: The relay contacts provide physical separation between the backplane logic and high-voltage field wiring. This isolation protects the FLEX I/O rack from electrical noise, transients, and potential ground loops originating from heavy industrial machinery.

Integrated Snubber Protection: The module incorporates a snubber circuit to manage off-state leakage and suppress electrical arcs during contact transition. This protection extends the mechanical life of the relay and prevents electromagnetic interference (EMI) from disrupting nearby sensitive electronics.

FAQs

What is the difference between the 1794-OW8 and the 1794-OW8XT?

The "XT" version features enhanced components and protective coatings that allow it to operate in extended temperature ranges. While they share the same logic and wiring footprint, the 1794-OW8XT provides superior reliability in non-climate-controlled environments.

Does this module require a separate terminal base?

Yes. The 1794-OW8XT must seat into a 1794 terminal base (such as the 1794-TB2, 1794-TB3, or 1794-TBN). The base handles all field wiring, allowing you to replace the module without disconnecting any wires.

Is this a Brand New original product?

Yes. We guarantee this unit is 100% Brand New and original. Using new relay modules is essential because relay contacts suffer from mechanical wear and oxidation over time; only a new module guarantees a full 30 mΩ initial contact resistance.

How do I ensure the longest life for the relay contacts?

Avoid exceeding the switching frequency of one operation every three seconds at full rated load. If your application requires high-speed cycling, consider using a solid-state output module instead to prevent mechanical fatigue.