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1794-OW8

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Allen-Bradley 1794-OW8 is a FLEX I/O module with eight isolated Form A normally open electromechanical relay outputs for AC or DC loads.
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Technical specifications for 1794-OW8

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-OW8
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O 8-Point Relay Output Module
  • Stock:
    1
  • Relay outputs:
    8
  • Contact form:
    Form A, normally open
  • Output isolation:
    Individually isolated
  • Maximum resistive load:
    2 A at 250 V AC
  • Low-voltage DC load:
    2 A at 5...30 V DC
  • Maximum switching frequency:
    0.3 Hz
  • Turn-on time:
    10 ms maximum
  • Turn-off time:
    10 ms maximum
  • Minimum mechanical life:
    100,000 operations at rated loads
  • Module supply:
    24 V DC, 125 mA
  • Recommended fuse:
    3 A, 250 V AC slow-blow
  • Operating temperature:
    -20...55 °C
  • Estimated shipping dimensions:
    4.6x9.4x5.3cm
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    Singapore
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Relay Life Planning Contact Loading Terminal Base Review Product Applications

Features:

  • Eight isolated relays: Form A contacts switch separate AC or DC circuits
  • Electromechanical operation: 10 ms response and a 0.3 Hz switching limit govern use
  • Load-specific ratings: contact current depends on voltage and load type
1794-OW8 is chosen when a FLEX I/O station must switch circuits that benefit from dry, individually isolated relay contacts.

Mechanical contact life and switching rate make duty cycle a primary selection question, particularly for coils or repetitive outputs.

A durable installation documents circuit voltage, load category, suppression, fuse, terminal base, and isolation method for all eight channels.

Availability of 1794-OW8 is subject to Apter Power inventory and sourcing confirmation.
Allen-Bradley 1794-OW8 FLEX I/O 8-Point Relay Output Module Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Relate switching duty to mechanical contacts

  • Frequency: keep operation at or below 0.3 Hz.
  • Life: use the published minimum operation count with the actual load category.
  • Timing: allow for 10 ms turn-on and turn-off behavior.
  • Duty record: capture cycle rate and energized duration for each output.

Apply the correct rating to each external circuit

  • AC load: compare voltage, current, and power factor with the relay rating.
  • DC load: use the specific current limit for the circuit voltage.
  • Inductive load: provide approved suppression and assess release energy.
  • Fuse: protect each circuit with the documented external approach.

Keep isolated circuits correctly separated

  • Compatible bases: confirm the approved TB2, TB3, TB3S, TBN, or TBNF option.
  • Energy sources: identify every external AC and DC supply.
  • Conductor labels: map contacts, loads, and returns point by point.
  • Service isolation: prove all hazardous circuits are de-energized before removal.

Officially supported application roles

  • Isolated switching: operate separate supported AC or DC field circuits.
  • Interposing duties: control contactors or relays within the published load limits.
  • Low-frequency actuators: switch devices whose duty respects mechanical relay life.
  • Mixed-voltage panels: maintain documented circuit separation across isolated contacts.
Description
1794-OW8 supplies eight isolated Form A, normally open relay outputs for switching supported AC or DC field loads. Electromechanical contacts separate the load circuits from FLEX I/O logic.

Published ratings for 1794-OW8 include 2 A resistive operation at 250 V AC and 2 A from 5...30 V DC, with load-specific limits at higher DC voltage. Ten-millisecond operating time and a 0.3 Hz maximum switching rate reflect the mechanical relay design.

Selection of 1794-OW8 should consider load type, contact life, switching frequency, suppression, fuse protection, terminal base, and safe isolation. Relay isolation does not remove the need to review each external circuit and its hazardous energy.
Revisions

Revision Part #

Also known as

1794-OW8 Series A
1794-OW8/A, Series A
Alternative Names
Allen-Bradley 1794-OW8 relay module Rockwell Automation 1794-OW8 AB 1794 OW8 1794OW8 isolated relay output FLEX I/O eight-relay module 1794-OW8 1794-OW8 Form A output
Technical notes
The model-specific risk for 1794-OW8 is applying a resistive contact rating to an inductive or frequently switched load. Review voltage and current by load type, 0.3 Hz switching frequency, contact life, suppression, external fuse, terminal-base compatibility, and isolation procedure for every relay circuit.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why is switching frequency a selection issue for 1794-OW8?
Its electromechanical relays are limited to 0.3 Hz, so a rapidly cycled output can consume contact life or exceed the intended mechanical duty.
How should a DC inductive load be assessed before connecting it to 1794-OW8?
Use the load-specific DC current rating, measure coil behavior, provide approved suppression, confirm release timing, and evaluate the external supply and fuse.
What can cause a relay contact on 1794-OW8 to weld closed?
Excess steady current, inrush, inductive energy, high switching frequency, failed suppression, or inadequate circuit protection can damage a mechanical contact.
Why must all external power sources be identified before removing 1794-OW8?
The eight contacts are isolated and may switch separate AC or DC supplies; disabling FLEXBus alone does not prove every field circuit is safe.
Which terminal-base details matter for 1794-OW8 installation?
Confirm the approved base catalog, keying, terminal assignments, conductor rating, isolation spacing, and access needed to fuse and service each load.
How can a technician distinguish a field-load fault from a failed relay in 1794-OW8?
Compare the controller command, output indication, contact continuity under safe isolation, load current, supply voltage, wiring, fuse, and suppression circuit.