Rated 3.8 with 7 reviews


Revisions: Ser A


The Allen-Bradley 1794-OW8 Flex I/O Relay Output Module has 8 Relay Outputs, a 1.0mA through Snubber Circuit Off-state Leakage Current, and a 100A at 100 mV DC Minimum Contact Load. It also operates with a 30 m? Initial Contact Resistance and a 1.2ms Bounce Time.

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About 1794-OW8

The Allen-Bradley 1794-OW8 is a FLEX I/O digital contact (relay) module. Eight isolated Normally-Open or N.O. contacts in this module are electromechanical and they can switch up to 2 Amps at up to 230 Volts AC and 125 Volts DC. It has a switching frequency of 0.3 Hertz, with 1 operation every 3 seconds. This module also has a mean bounce time of 1.2 milliseconds. Use only +24 Volts DC power for the 1794-OW8’s power terminals because variations in relay switching time of the outputs may cause one of the relays to momentarily switch the total load current. The entire module measures 1.8 x 3.7 x 2.1 inches. It is compatible with several terminal base units, namely the 1794-TB3, 1794-TB2, 1794-TBN, 1794-TB3S, 1794-TB3K, 1794-TBNF, 1794-TBNKF, and the 1794-TB3SK. It also has a mechanical life of 100,000 operations at rated loads.

The resistive relay output current ratings of the 1794-OW8 are 2 Amps at 5 to 30 Volts DC, 0.22 Amps at 125 Volts DC, and 2 Amps for 125 Volts DC and 250 Volts DC. The module also has a continuous isolation voltage of 250 Volts for relay to another relay, to the backplane, and to the power, and 50 Volts for power to the backplane. The external DC supply voltage range of this module is 19.2 to 31.2 Volts DC and it includes the 5% AC ripple and a nominal external DC supply current of 125 mA. It has a maximum off-state leakage current of 1 mA at 240 Volts AC through a snubber. The 1794-OW8’s initial contact resistance is 30 mOhms and its minimum contact load is 100 µA at 100 mV DC. It also has a maximum power dissipation of 5.5 Watts and a maximum thermal dissipation of 18.8 BTU/hour, both at 31.2 Volts DC. The maximum output delay time for both the OFF to ON and the ON to OFF states are 10 milliseconds.

Technical specifications:

Part Number:1794-OW8
Product Type:Flex I/O Relay Output Module
Outputs:8 Relay
Off-state Leakage Current:1.0mA through Snubber Circuit
Minimum Contact Load:100 A at 100 mV DC
Relay Contact:250 Volts AC
Initial Contact Resistance:30 m
Bounce Time:1.2 milliseconds
Switching Frequency:1 operation/3 s (0.3Hz at rated load) max
Flexbus Current:5V DC
Power Dissipation:5.5 Watts
Thermal Dissipation:18.8 BTU/hour at maximum


Question: How is the 1794-OW8 grounded?

Answer: The 1794-OW8 is grounded through the DIN rail down to the ground. For proper grounding use a zinc plated yellow-chromate steel DIN rail. 


Question: What is the power dissipation for the 1794-OW8?

Answer: The power dissipation for the 1794-OW8 is 5.5 Watts. 


Question: What kind of fusing is recommended for the 1794-OW8?

Answer Specifically, 3.0 A, 240 Volt AC slow-blow fuses are recommended for the 1794-OW8. 


Question: Can this module be purchased with a warranty?

Answer: Yes, the 1794-OW8 comes with a free one-year warranty from DO Supply, Inc.


Question: What is this module’s power dissipation?

Answer: The 1794-OW8 has a power dissipation around 5.5 Watts.


Question: Where can I send the 1794-OW8 to be repaired?

Answer: DO Supply, Inc. offers a variety of repair services for the 1794-OW8.

Please refer to the manual for more information about the 1794-OW8 such as the wiring diagrams, data sheets, firmware information and migration or obsolescence details.

Revision Part # Also Known as Availability
1794-OW8 Ser A
1794-OW8/A, Series A, Rev A Request Quote

Common misspellings: 1794OW8
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