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Siemens CFD63B250L Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Siemens
CFD63B250L
Molded Case Circuit Breaker
Brand
Siemens
SKU
CFD63B250L
Quantity
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Siemens CFD63B250L - 250A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for industrial power distribution, the Siemens CFD63B250L is a 250A molded case circuit breaker from the Sentron family. This FD frame unit provides thermal-magnetic protection with long-time and instantaneous (LI) trip functions. Designed for unit mount setups, it installs into Siemens Sentron panelboards and switchboards. It includes factory-installed line and load lugs. Rated 200 kAIC at 480V, this current-limiting breaker utilizes blow-apart contacts to rapidly clear faults.Specifications
| Brand | Siemens |
|---|---|
| Part Number | CFD63B250L |
| Series | CFD6 |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480VAC, 100kA @ 600VAC, 30kA @ 500VDC |
| Frame Type | FD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards, 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 (Factory Installed) |
| Standards | HACR Rated, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, HACR Rated, Fuseless |
Product FAQs
7 answersWhat equipment is compatible with the CFD63B250L FD frame breaker?
It is designed for unit-mount installations in Siemens Sentron panelboards, switchboards, and standalone enclosures. The FD frame footprint ensures a standardized fit across compatible Siemens distribution equipment.
What does the L suffix in the CFD63B250L catalog number indicate?
The L signifies that the breaker includes factory-installed line and load lugs. These standard lugs accommodate 6 AWG to 350 kcmil copper or 4 AWG to 350 kcmil aluminum conductors.
What replacement lugs are used for the CFD63B250L?
The standard replacement line and load lugs for this 250A FD frame breaker are catalog number TA1FD350A.
How is the CFD63B250L mounted in a panelboard?
This is a unit-mount breaker with a feed-thru connection. It bolts directly to the mounting pan or chassis rather than plugging onto a busbar, making it suitable for subfeed applications or standalone enclosures.
How is the magnetic trip adjusted on the CFD63B250L?
While the thermal (long-time) protection is fixed at 250 amps, the magnetic (instantaneous) trip is adjustable. Electricians can tune the magnetic pickup dial on the front of the breaker to coordinate with downstream devices and specific inrush currents.
Is the CFD63B250L rated for DC voltage systems?
Yes, in addition to its AC ratings, this thermal-magnetic breaker is rated for 500VDC applications, providing up to 30 kAIC interrupting capacity for DC circuits.
Does the CFD63B250L provide current-limiting protection?
Yes, the CFD6 series utilizes a fuseless, current-limiting design. It features blow-apart contacts that rapidly extinguish arcs during high-level faults, achieving a 200 kAIC rating at 480VAC without requiring external fuses.
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