Eaton HNB31200T Circuit Breaker
- 1200
- 3 Pole
Quantity
Eaton HNB31200T 3 Pole Circuit Breaker
Re-Certified
Quantity
Description
Eaton HNB31200T 3 Pole Circuit Breaker
The Eaton HNB31200T is a 3 Pole thermal magnetic molded case circuit breaker with a current rating of 1200 Amps and a voltage rating of 240V. The HNB31200T has a temperature rating of 40°C and includes LI - long time and instantaneous trip functions.
Specifications
Product FAQs
8 answersWhat is the interrupting capacity (AIC) for the Eaton HNB31200T?
This N-Frame circuit breaker trip unit features a high interrupting capacity of 100 kAIC at 240V AC.
What is the magnetic trip adjustment range for this 1200A unit?
The instantaneous magnetic trip on the HNB31200T is adjustable between 4000A and 8000A.
Which circuit breaker frames are compatible with the HNB31200T?
This trip unit is designed specifically for Eaton and Cutler-Hammer Series C N-Frame circuit breakers, including the NB, HNB, and NBY frames.
Is the Eaton HNB31200T interchangeable with Cutler-Hammer and Westinghouse models?
Yes. Eaton acquired both the Cutler-Hammer and Westinghouse distribution equipment lines. The HNB31200T catalog number is identical and fully interchangeable across these legacy brands.
What wire sizes do the standard lugs accept for this 1200A breaker?
Standard TA1200NB1 pressure terminals for this 1200A frame typically accept four 4/0 to 500 kcmil aluminum or copper conductors per phase. Lugs are often sold separately from the trip unit.
What does the 40°C temperature rating mean for installation?
The 40°C (104°F) rating is the standard ambient calibration temperature. If installed in an environment exceeding this temperature, the 1200A continuous current capacity must be derated to prevent nuisance tripping.
How do the LI trip functions operate on this breaker?
The LI designation stands for Long-Time and Instantaneous protection. The thermal long-time element is fixed at 1200A for overload protection, while the instantaneous magnetic element is adjustable from 4000A to 8000A for short-circuit protection.
Does this trip unit require a rating plug?
No. The HNB31200T is a thermal-magnetic trip unit, which does not use interchangeable rating plugs. Rating plugs are only required for electronic trip units in the Series C line.
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