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Siemens FJ63B175 Molded Case Circuit Breaker
- 175A
- 3 Pole
- Bolt-On
Siemens
FJ63B175
Molded Case Circuit Breaker
Brand
Siemens
SKU
FJ63B175
Quantity
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Siemens FJ63B175 - 175A 3 Pole Molded Case Circuit Breaker
Re-Certified
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Description
Built to handle demanding electrical loads, this 175-amp, three-pole molded case breaker provides essential long-time and instantaneous protection. The thermal-magnetic trip mechanism ensures reliable operation across diverse commercial environments. It mounts securely into legacy I-T-E F-Frame panelboards, as well as modern Siemens P1, P2, and P3 load centers. Facility managers often utilize this model to maintain existing infrastructure.Specifications
| Brand | Siemens |
|---|---|
| Part Number | FJ63B175-R |
| Series | FJ6 |
| Amperage | 175A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 22kA @ 480VAC, 18kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | FJ63 |
|---|---|
| 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, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
5 answersWhich panelboards are compatible with the FJ63B175 circuit breaker?
This bolt-on breaker is designed for use in modern Siemens P1, P2, and P3 panelboards, SB switchboards, and legacy I-T-E F-Frame panelboards.
What wire sizes and materials are accepted by the lugs on the FJ63B175?
The load-side lugs accept 6 AWG to 350 kcmil wire and are dual-rated for both copper and aluminum conductors.
How does the trip unit function on the FJ63B175?
It utilizes a thermal-magnetic trip unit. The thermal element provides fixed long-time overload protection, while the magnetic element is adjustable for instantaneous short-circuit protection.
Can I use the Siemens FJ63B175 to replace an older I-T-E breaker?
Yes. Siemens acquired I-T-E, making the FJ63B175 the direct manufacturer replacement for legacy I-T-E F-Frame breakers that share the same 175A, 3-pole configuration.
Is the FJ63B175 rated for direct current (DC) applications?
Yes, in addition to its AC ratings, this breaker is rated for up to 250VDC with a 10kA interrupting capacity, allowing it to be used in compatible DC circuits.
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