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Siemens FXD63B250L Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Siemens
FXD63B250L
Molded Case Circuit Breaker
Brand
Siemens
SKU
FXD63B250L
Quantity
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Siemens FXD63B250L - 250A 3 Pole Molded Case Circuit Breaker
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Description
Built for commercial power distribution, the Siemens FXD63B250L is a 250A, 3-pole thermal-magnetic circuit breaker. This "L" suffix model comes complete with line and load side lugs, accepting 6 AWG to 350 kcmil wire. The FD frame breaker installs into Siemens P1, P2, and P3 Sentron panelboards or switchboards. It features a non-interchangeable trip unit with fixed thermal and adjustable magnetic settings. Delivering a 35kAIC rating at 480VAC, it is HACR rated and UL listed for reverse feed.Specifications
| Brand | Siemens |
|---|---|
| Part Number | FXD63B250L |
| Series | FXD6 |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 22kA @ 600VAC, 30kA @ 250VDC, 14kA @ 500VDC |
| Frame Type | FD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards (P1, P2, P3), Switchboards, Enclosures |
| Wire Gauge | 6 AWG-350 kcmil (Cu), 4 AWG-350 kcmil (Al) |
| Max Wire | 350 kcmil |
| Min Wire | 6 AWG (Cu), 4 AWG (Al) |
| 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 | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
9 answersDoes the FXD63B250L come with lugs installed, or do I need to purchase a separate kit?
The L suffix in the FXD63B250L catalog number indicates that line and load lugs are included from the factory. The standard lug kit is the TA1FD350A, which accepts 6 AWG to 350 kcmil copper or 4 AWG to 350 kcmil aluminum wire.
Can the FXD63B250L be reverse fed in a panelboard?
Yes, this breaker is UL listed for reverse feed applications. The thermal magnetic trip unit operates effectively regardless of whether power is supplied to the line or load side terminals.
Which NEMA enclosures are compatible with the 250A FD frame breaker?
For a standalone installation, you can mount this breaker in Siemens Sentron FD frame enclosures. Common options include the F6N1F for NEMA 1 flush mounting, the F6N1S for NEMA 1 surface mounting, and the F6N3R for NEMA 3R outdoor applications.
What is the adjustable magnetic trip range for this 250A breaker?
While the thermal overload protection is fixed at 250 amps, the instantaneous magnetic trip is adjustable. The magnetic trip range for the 250A FD frame can be set between 1100A and 2500A to coordinate with downstream devices and prevent nuisance tripping.
Will the FXD63B250L fit into my existing Siemens panelboard?
This unit mount breaker is designed to integrate into Siemens Sentron P1, P2, and P3 panelboards, as well as compatible switchboards. Note that unit mount breakers require the appropriate strap kits or mounting hardware to connect to the panelboard bus, which must be sourced separately.
Is there a newer replacement series for the FXD63B250L?
Yes, Siemens is transitioning from the legacy Sentron FD frame to the newer 3VA52 series for 250A applications. However, the 3VA breakers have different dimensions and require specific mounting kits to fit into older Sentron panelboards.
Can this breaker be used in DC power systems?
Yes, the FXD63B250L is rated for use in DC applications up to 500VDC. It provides an interrupting capacity of 30kA at 250VDC and 14kA at 500VDC, and it is UL rated for use on 500VDC ungrounded UPS systems.
Can I swap the trip unit on the FXD63B250L if my load requirements change?
No, the FXD63B250L features a non-interchangeable thermal magnetic trip unit. If you need a breaker with an interchangeable trip unit in the 250A FD frame, you would need to select a different model, such as the HFD63F250.
Is the FXD63B250L suitable for HVAC equipment?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires circuit protection.
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