Allen-Bradley 1794-OW8 FLEX I/O 8 Relay Output Module

 

General Specifications

• Outputs per Module:
  • 1 group of 8 Form A (normally open) isolated electromechanical relays.
• Module Location:
  • Mounts on the following Terminal Base Units:
    • 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN, 1794-TBNF.
  • For 1794-TBNF, use 3.0 A, 250V AC slow-blow fuses (Littelfuse part number 239003).
• Off-State Leakage Current:
  • Maximum 1.0 mA at 240V AC through the snubber circuit.
• Minimum Contact Load:
  • 100 µA at 100 mV DC.
• Flexbus Current:
  • 5V DC, 35 mA.

---

Power and Voltage Specifications

• Supply Voltage:
  • 24V DC, 125 mA (1794-OW8).
  • 19.2…31.2V DC, 125 mA (1794-OW8XT).
• Relay Contact Ratings:
  • 250V AC, 2 A, Resistive, 50/60 Hz.
  • 120/240V AC, Pilot Duty, 50/60 Hz:
    • 1800V A Make, 180V A Break.
  • 5…30V DC, 2 A, Resistive.
  • Pilot Duty Rating: R150, 28V A (not to exceed 1 A below 28V DC).

---

Performance Specifications

• Output Signal Delay:
  • OFF to ON: Max 10 ms.
  • ON to OFF: Max 10 ms.
• Initial Contact Resistance:
  • Max 30 mΩ.
• Switching Frequency:
  • Max 1 operation every 3 seconds (0.3 Hz at rated load).
• Bounce Time:
  • Mean 1.2 ms.
• Expected Contact Life:
  • Minimum 100,000 operations at rated loads.

---

Thermal and Power Characteristics

• Thermal Dissipation:
  • Max 18.8 BTU/hr.
• Power Dissipation:
  • Max 5.5 W.

---

Isolation and Safety

• Isolation Voltage:
  • 250V (continuous), Basic Insulation between:
    • Relay to relay, relay to backplane, and relay to power.
  • 50V (continuous), Basic Insulation between power and backplane.
  • Type-tested isolation:
    • 1500V AC for 60 s (relay-to-relay).
    • 3250V DC for 60 s (relay-to-backplane and relay-to-power).
    • 720V DC for 60 s (power-to-backplane).
• Fusing:
  • Recommended 3.0 A, 250V AC slow-blow fuses (Littelfuse part number 239003).

---

Indicators and Physical Characteristics

• Status Indicators:
  • 8 yellow LED indicators for output status.
• Keyswitch Position:
  • 9.
• Terminal Screw Torque:
  • Determined by the installed terminal base.
• Dimensions (HxWxD):
  • Approx 94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.), with module installed.
• Enclosure:
  • None (open-style).
• Wiring Category:
  • Refer to Industrial Automation Wiring and Grounding Guidelines for routing conductor details.

 

---

Contact Us

• Phone: +86-15915488782
• Email: uma@meloauto.com
• WhatsApp: +8615915488782
• Business Hours: 24/7 service
• Address: Unit 601, Powerlong International Center, No. 1599 Luling Road, Siming District, Xiamen City, Fujian, China

Let us help you find the automation parts you need with reliable quality and dedicated support!