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Siemens FJ3B225 Molded Case Circuit Breaker
- 225A
- 3 Pole
- Bolt-On
Siemens
FJ3B225
Molded Case Circuit Breaker
Brand
Siemens
SKU
FJ3B225
Quantity
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Siemens FJ3B225 - 225A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial and industrial applications, the Siemens FJ3B225 delivers 225A of thermal-magnetic protection. This 3-pole bolt-on molded case circuit breaker is part of the legacy F-Frame family. It installs into Siemens and I-T-E FC, CDP, and SB panelboards, providing a reliable solution for existing infrastructure. Featuring a 22kAIC rating at 240VAC and non-interchangeable trip units, it is commonly replaced by the newer FD63B225 model for facility upgrades.Specifications
| Brand | Siemens |
|---|---|
| Part Number | FJ3B225-R |
| Series | FJ |
| Amperage | 225A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 22kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens / I-T-E Panelboards (e.g., FC, CDP, SB) |
| Wire Gauge | 6 AWG - 350 kcmil (Cu/Al) |
| Max Wire | 350 kcmil |
| Min Wire | 6 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Undervoltage Release, Padlock Attachment |
|---|---|
| Accessories | Lugs |
| Standards | UL 489, CSA C22.2 No. 5, NEMA AB-1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip, Reverse Feed |
Product FAQs
9 answersWhich panelboards are compatible with the Siemens FJ3B225 circuit breaker?
This bolt-on F-frame breaker is designed for installation in legacy Siemens and I-T-E panelboards, specifically the FC, CDP, and SB series.
Is there a modern replacement for the legacy FJ3B225 breaker?
Yes, the Siemens FD63B225 is commonly used as a modern replacement for facility upgrades. Consult a licensed electrician to verify fitment and mounting requirements in your specific panel.
What type of conductors are permitted for the FJ3B225 load lugs?
The factory-installed load lugs are dual-rated for both copper (Cu) and aluminum (Al) conductors, accepting wire sizes from 6 AWG up to 350 kcmil.
Is the 14kAIC rating at 480V sufficient for my application?
A 14kA interrupting capacity at 480VAC is standard for legacy F-frame breakers and suitable for many light industrial applications. However, a licensed electrician or engineer must perform a short-circuit study to ensure the available fault current at your panel does not exceed 14,000 amps.
Is the FJ3B225 the same as the I-T-E FJ3-B225?
Yes, FJ3-B225 is an alternate catalog format for the exact same 225A F-frame circuit breaker, originally manufactured by I-T-E and later by Siemens.
Are the trip settings adjustable on the FJ3B225?
No, this breaker features a fixed thermal and fixed magnetic trip unit. It provides standard Long-Time and Instantaneous (LI) protection without field adjustability.
Can the FJ3B225 be utilized in 250VDC control circuits?
Yes, this thermal-magnetic breaker is rated for DC applications up to 250VDC with a 10kA interrupting capacity, allowing it to protect industrial DC power and control systems.
What is the proper installation method for the FJ3B225?
This is a bolt-on breaker that must be mechanically fastened to the busbars of a compatible Siemens or I-T-E panelboard. It cannot be used in plug-on or load center applications.
Is the FJ3B225 approved for use in the United States and Canada?
Yes, this breaker meets UL 489 and CSA C22.2 No. 5 standards, making it fully approved for commercial and industrial installations in both the US and Canada.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 3 reviews.
Total 5 star reviews: 3 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
3 reviews
- JMJoseph M.Verified BuyerReviewingSiemens / ITE FJ3S225 - 225A 3 Pole Molded Case SwitchI recommend this productRated 5 out of 5 stars3/20/26Siemens / ITE FJ3S225 - 225A 3 Pole Molded Case Switch
Correct item.
- BGBrad G.ReviewingSiemens / ITE FJ3B200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/19/21Great Service
We have had great luck with this company!! Great shipping and excellent customer service!
- CGClyde G.ReviewingSiemens FJ3B225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/8/18Had good results with your
Had good results with your people they was very helpful. Shipping was good and on time and products was right.