Allen-Bradley 1797-TB3
Allen-Bradley 1797-TB3
Allen-Bradley 1797-TB3
Allen-Bradley 1797-TB3
Allen-Bradley 1797-TB3
Allen-Bradley 1797-TB3
Ask our team:
  • Phone: +86 181 0690 9650
  • E-Mail sales1@apterpower.com

1797-TB3

/ 4.9
1001 reviews | Need a Specific Revision?
This 1797-TB3 terminal base is specifically designed for handling intrinsically safe signal distribution in hazardous area applications, solving the critical challenge of maintaining safety integrity while enabling flexible I/O configuration in explosive atmospheres.
Get a quick price for 1797-TB3
Quantity
*E-mail
Company
*Mobile
*Content
Upload (gif, jpg, jpeg, png, bmp, doc, docx, xls, xlsx, ppt, pdf, csv)

Technical specifications for 1797-TB3

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1797-TB3
  • Product Family:
    Flex I/O
  • Number of Terminals:
    1 row of 16, 2 rows of 18
  • Terminal Screw Torque:
    0.8…1.0 Nm (7…9 lb-in)
  • Isolation Voltage:
    Channel-to-channel isolation determined by inserted module
  • Flexbus Connection Rating:
    Less than 10 Volts DC
  • Operational Shock:
    15 G at 11 milliseconds
  • Operational Vibration:
    2 G at 10 to 500 Hertz
  • Weight:
    0.25 kg
  • Estimated shipping dimensions:
    9.6x9.6x5.8cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • 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 Specifications Use Cases Compatibility & Interoperability Performance & Efficiency

Features:

  • Integral Terminal Base for FLEX Ex Intrinsically Safe Distributed I/O System
  • Provides Secure Screw-cage Connections with Channel-to-Channel Isolation Capability
  • Supports Safe Operation in Hazardous Environments Through Dedicated Intrinsically Safe Circuit Terminals
The Allen-Bradley 1797-TB3 FLEX Ex Screw-cage Terminal Base serves as the fundamental wiring interface for FLEX Ex modules, establishing reliable field connections within intrinsically safe distributed I/O architectures. It accommodates a total of 52 terminals arranged in one row of 16 terminals and two rows of 18 terminals each, with specific terminal assignments designated for the female I/O connector pins 30…32, 62…64, and 94…96 at terminals +34, -35, +50, -51, and 96, and terminals 36 and 49 reserved for connections with ratings of Ui less than 30V dc and Ii less than 100 mA. All remaining terminals are exclusively allocated for intrinsically safe circuits with ratings of Ui less than 10V dc and Ii less than 2.5 A, ensuring strict segregation between safety-rated and standard wiring paths. The unit requires a screw torque between 0.8 and 1 N-m for secure terminal connections and delivers channel-to-channel isolation determined by the inserted module, directly affecting the integrity and safe operation of the overall FLEX Ex system.

The 1797-TB3 occupies a compact footprint with installed dimensions of 3.7 inches in width, 3.7 inches in length, and 2.7 inches in height, weighing approximately 200 grams, and mounts conveniently via DIN rail configurations. It is always utilized in conjunction with FLEX Ex I/O modules to provide the essential terminal base functions common to each module installation, and one 1797-TB3 terminal base is required per FLEX Ex module depending on the specific I/O configuration.

For intrinsically safe Flexbus communication, the 1797-TB3 terminal base incorporates a dedicated Flexbus connection rated intrinsically safe with Ui less than 10V dc, Ii less than 400 mA, Ci less than 1 nF, and negligible Li, enabling safe daisy-chaining between adjacent FLEX Ex modules. In addition to standard single-module wiring, the terminal base also supports proper grounding and shielding practices. The 1797-TB3 FLEX Ex terminal base executes reliable signal distribution using the screw-cage terminal design specified in the hardware specifications. Using this method, the terminal base continually maintains secure wire retention and electrical continuity. If the system requires maintenance or module replacement, the wiring remains undisturbed on the 1797-TB3 while the electronic module is removed or inserted.

The 1797-TB3 Allen-Bradley FLEX Ex Screw-cage Terminal Base may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1797-TB3 FLEX Ex Screw-cage Terminal Base Manuals,Datasheets,Link 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.
Allen-Bradley 1797-TB3 FLEX Ex Screw-cage Terminal Base Specs

General

  • Manufacturer Allen-Bradley
  • Model 1797-TB3
  • Condition New Original ready stock
  • Product Family 1797-TB3S,1797-OE8,1797-IRT8
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.
  • Hazardous Environment Deployment: Primarily used in Zone 1, Zone 2, and Zone 22 (Europe) or Class I, Division 1 & 2 (North America) locations where explosive atmospheres from gases, vapors, or dust are likely to occur.
  • Decentralised I/O Control: Ideal for applications requiring I/O connections near field devices in hazardous zones to reduce long wiring runs to safe areas.
  • Industrial Automation: Commonly applied in oil and gas, chemical processing, and pharmaceutical industries where intrinsically safe apparatus is required by CENELEC, UL, and FM standards.
  • Module Compatibility: Specifically designed for use with FLEX Ex I/O modules, such as analog, thermocouple, and frequency input modules (e.g., 1797-IE8, 1797-IJ2).
  • System Integration: Compatible with the 1794 FLEX I/O system via bus isolator modules (1797-BIC/1797-CEC), allowing a mix of intrinsically safe and non-IS modules on the same backplane.
  • Backplane Formation: Units plug together to form the Flexbus backplane, providing connection points for power and communication between modules.
  • Wiring Density: Features 36 to 52 screw-clamp terminals (depending on configuration), supporting wire sizes from 22–12 AWG (0.34–2.5 ㎜² ) for compact, high-density connections.
  • Rugged Environmental Tolerance: Operates efficiently from -20 °C to 70 °C and resists up to 15 G operational shock and 2 G vibration, ensuring reliability in harsh conditions.
  • Intrinsic Safety Efficiency: Reduces costs by eliminating the need for bulky explosion-proof enclosures for every module, as the system itself is certified for Zone 1 installation.
  • Quick Installation: Designed for DIN rail mounting with a locking latch mechanism for secure module placement and easy removal.
Description
The Allen-Bradley 1797-TB3 is a FLEX Ex Screw-cage Terminal Base designed for intrinsically safe applications in hazardous environments. This terminal base unit serves as an integral component within the FLEX Ex series, specifically engineered to provide secure and reliable field wiring connections for distributed I/O systems in process industries. The 1797-TB3 features a comprehensive terminal configuration with specific assignments: terminals +34, -35, +50, -51, and 96 are designated for the female I/O connector pins 30…32, 62…64, and 94…96, while terminals 36 and 49 serve distinct connection purposes. All remaining terminals are exclusively reserved for intrinsically safe circuits, ensuring proper segregation of safety-rated wiring from standard connections.

The 1797-TB3 operates efficiently within a temperature range of -20 to 70 degrees Celsius while providing storage capabilities at temperatures between -40 to 85 degrees Celsius. Its non-condensing humidity resistance spans from 5% to 95%, making it suitable for diverse environments. The Flexbus connection is intrinsically safe with ratings of Ui less than 10V dc, Ii less than 400 mA, Ci less than 1 nF, and negligible Li. For the designated terminals 36 and 49, the ratings are Ui less than 30V dc, Ii less than 100 mA, Ci less than 1 nF, and negligible Li. All other terminals must not be used for any connection. The product demonstrated resilience against operational shocks up to 15 G for a duration of 11 milliseconds, and it can withstand vibrations up to 2 G within a frequency range of 10 to 500 Hertz. Mounting is facilitated via DIN rail configurations, further supporting its deployment in various applications.

 It addresses the need for reliable terminal segregation in process control environments where proper isolation between intrinsically safe and non-intrinsically safe circuits is paramount. The unit is ideal for deployment in chemical processing plants, oil and gas production facilities, pharmaceutical manufacturing operations, and other industrial settings where FLEX Ex distributed I/O systems require secure, compliant terminal connections that adhere to strict intrinsic safety standards.
Alternative Names
1797-TB3S 1794-TB3 1794-TB32 1794-TB3S
Technical notes
The 1797-TB3 terminal base is configured with a total of 52 terminals, ensuring ample connection options with a layout consisting of one row of 16 terminals and two rows of 18 terminals each. This terminal base supports a required screw torque between 0.8 and 1 N-m for secure terminal connections.
Exceptional Service

Our Mission

  • 100% Satisfaction

    We believe expertise is priceless. With over 20 years of experience, and top engineers on staff, we can help you solve or avoid problems that threaten your business.
  • Trust Guaranteed

    Not only do we have a vast inventory, our team makes sure every piece of equipment is in working condition. Your purchases are also backed by our Warranty.
  • Expertise

    Time is money, especially when your equipment is down. We work quickly to get your equipment on its way so you can get it back up and running.

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.
What intrinsic safety ratings does the 1797-TB3 provide?
The Flexbus connection is intrinsically safe with limits such as Ui < 10V DC and Ii < 400 mA. Terminals 36 and 49 have higher limits (Ui < 30V DC, Ii < 100 mA). All other terminals are strictly designated for intrinsically safe circuits and must not be used خارج these specifications.
How does the 1797-TB3 ensure reliability in harsh conditions?
The unit is designed to withstand shocks up to 15G for 11 milliseconds and vibrations up to 2G across a frequency range of 10 to 500 Hz. These features ensure stable performance in demanding industrial environments.
In which applications is the 1797-TB3 typically used?
It is widely used in hazardous area applications such as chemical processing, oil and gas production, pharmaceutical manufacturing, and other industries where intrinsically safe distributed I/O systems are required.

Product Browsing History