Maintaining legacy electrical distribution networks demands precise hardware compatibility. This 30A, two-pole breaker fastens securely into Federal Pacific NB and NBLP panelboards to restore branch circuit functionality. Rated for 10kAIC at 120/240VAC, the thermal-magnetic design delivers consistent overcurrent response. Facilities can also utilize the UBIF230NB as a modern substitute for this frame.
Which Federal Pacific panelboards will accept this circuit breaker?
The NB221030 is designed specifically for legacy Federal Pacific NB and NBLP series panelboards.
Does this breaker use the Federal Pacific Stab-Lok mounting design?
No. Unlike residential Stab-Lok plug-in breakers, the NB series features a secure bolt-on mounting mechanism designed for commercial distribution panels.
Can the thermal-magnetic trip settings be adjusted on this breaker?
No. The trip unit has fixed long-time and instantaneous protection settings that cannot be modified in the field.
What wire gauge range do the load terminals support?
The factory lug terminals are sized to accept conductors ranging from 14 AWG up to 2 AWG.
Is the NB221030 circuit breaker suitable for DC voltage applications?
This specific molded case circuit breaker is rated strictly for AC systems up to 240V and is not evaluated for direct current applications.
Can this breaker be installed in systems with high fault current availability?
The breaker has a maximum interrupting capacity of 10kA at 120/240VAC. It must not be installed in electrical systems where the available fault current exceeds this rating.
Is this a current production breaker from Federal Pacific?
Federal Pacific no longer manufactures these breakers. The NB221030 is considered a legacy component sourced specifically to support and maintain existing NB and NBLP electrical systems.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 18 reviews.
Federal Pacific NB100 - 100A 2 Pole Miniature Circuit Breaker
I recommend this product
Rated 5 out of 5 stars
7/2/26
100amp federal pacific breaker
So far the breaker works as expected
Just good to know some of these old federal are still available.
Thank you
SG
scott g.
Verified Buyer
Reviewing
Federal Pacific NB111020 - 20A 1 Pole Molded Case Circuit Breaker
I recommend this product
Rated 5 out of 5 stars
6/26/26
Hard to find breakers
Had a project at a school built in the 1960’s and thought we were up a creek when confronted with ancient FPE commercial panels. Luckily we found what we needed with Suoerbreakers.
BF
Barry F.
Verified Buyer
Reviewing
Federal Pacific NB100 - 100A 2 Pole Miniature Circuit Breaker
I recommend this product
Rated 5 out of 5 stars
6/13/26
Hard to find circuit breaker
Item was as described.
WW
William W.
Verified Buyer
Reviewing
Federal Pacific NB100 - 100A 2 Pole Miniature Circuit Breaker
I recommend this product
Rated 5 out of 5 stars
3/9/26
Exactly what I needed.
Awesome! Packaging and delivery were good. Bolted in and worked perfectly!!)
GH
Gary H.
Verified Buyer
Reviewing
Federal Pacific NB125 - 125A 2 Pole Miniature Circuit Breaker