Allen-Bradley 1794-TBNF Fused Terminal Base Unit

FAQ

Q1. What is the main function of 1794-TBNF?
It is a terminal base used to connect field wiring to FLEX I/O modules with built-in fuse protection for output channels.

Q2. What does the “F” mean in TBNF?
“F” stands for Fused, meaning the base includes individual fuses for protecting field circuits.

Q3. How many channels are fused?
It provides 8 fused channels, typically on even-numbered terminals.

Q4. What type of fuses are used?
It uses 5×20 mm replaceable fuses, commonly slow-blow type for industrial loads.

Q5. What modules is it used with?
Commonly used with output modules such as:

• 1794-OA8 / OA8I
• 1794-OW8 / OW8XT

Q6. Does it process signals or logic?
No, it only provides wiring and protection. All logic is handled by the I/O module.

Q7. What is the advantage over 1794-TBN?

• TBN: standard wiring base
• TBNF: adds per-channel fuse protection, improving safety and fault isolation

Q8. When should I use TBNF instead of other bases?
Use it when output protection is required, especially for AC loads, relays, or devices where short-circuit protection is critical.

1794-TBNF Allen Bradley

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