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Siemens FJ63B250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Bolt-On
Siemens
FJ63B250
Molded Case Circuit Breaker
Brand
Siemens
SKU
FJ63B250
Quantity
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Siemens FJ63B250 - 250A 3 Pole Molded Case Circuit Breaker
Re-Certified
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Description
Integrating seamlessly into industrial power systems, this 250-amp F-frame breaker offers robust thermal-magnetic defense. The three-pole unit mounts into legacy I-T-E enclosures, Siemens SB switchboards, and P-series panelboards. With an interrupting rating of 25kA at 240V and adjustable magnetic trip capabilities, it serves as an exact replacement for older FD63B250 models in commercial facilities.Specifications
| Brand | Siemens |
|---|---|
| Part Number | FJ63B250-R |
| Series | FJ6 |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 22kA @ 480VAC, 18kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P1, P2, P3 Panelboards, SB Switchboards, I-T-E F-Frame Panelboards |
| 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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards and switchboards are compatible with the FJ63B250 circuit breaker?
This F-frame breaker is designed for use in Siemens P1, P2, and P3 panelboards, Siemens SB switchboards, and legacy I-T-E F-frame panelboards.
What wire sizes and materials are accepted by the load lugs on this breaker?
The included load-side lugs accept wire gauges from 6 AWG up to 350 kcmil and are rated for both copper (Cu) and aluminum (Al) conductors.
Can the Siemens FJ63B250 be used in direct current (DC) applications?
Yes, this thermal-magnetic breaker is rated for use in DC systems up to 250VDC, providing an interrupting capacity of 10kA for DC loads.
How does the FJ63B250 mount into the panelboard?
It features a bolt-on mounting style, allowing for a secure, direct connection to the busbars in compatible Siemens and I-T-E distribution equipment.
What type of trip unit is equipped on the FJ63B250?
It features a thermal-magnetic trip unit with fixed thermal (long-time) and fixed magnetic (instantaneous) trip functions for standard overcurrent and short-circuit protection.
Is the FJ63B250 suitable for replacing older I-T-E breakers?
Yes, as part of the legacy I-T-E and Siemens F-frame family, it serves as a direct replacement for older I-T-E FJ6 series 250A, 3-pole breakers in existing enclosures.
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