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Siemens CFD63M250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Bolt-On
Siemens
CFD63M250
Molded Case Circuit Breaker
Brand
Siemens
SKU
CFD63M250
Quantity
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Siemens CFD63M250 - 250A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for heavy-duty power distribution, the Siemens CFD63M250 is a 3-pole, 250A MCCB from the Sentron family. This FD frame unit is calibrated for 50°C ambient environments and features a non-interchangeable thermal-magnetic trip. It mounts into Siemens P2 and P3 panelboards, switchboards, and motor control centers via a secure bolt-on connection.Specifications
| Brand | Siemens |
|---|---|
| Part Number | CFD63M250 |
| Series | CFD6 |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480VAC, 100kA @ 600VAC, 30kA @ 500VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P2, P3 Panelboards, Switchboards, Motor Control Centers |
| 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, Motor Operator, Rotary Handle, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 50C |
| Construction Features | Current Limiting, HACR Rated, Non-Interchangeable Trip, Trip-Free Mechanism, 50C Ambient Calibration |
| Special Features | Current Limiting |
Product FAQs
8 answersWhat does the M in the CFD63M250 catalog number indicate?
The M indicates that the breaker is calibrated for a 50 degrees Celsius ambient temperature. Standard Siemens Sentron breakers, which typically use a B in the catalog number, are calibrated for 40 degrees Celsius.
What does the C in the CFD6 prefix signify?
The C designates this as a current-limiting breaker within the Siemens Sentron FD frame family. It restricts let-through current during a fault to protect downstream electrical equipment.
What is the difference between the CFD63M250 and the CFD63B250?
Both are 250A, 3-pole, current-limiting FD frame breakers. The CFD63B250 is calibrated for standard 40 degrees Celsius environments, while the CFD63M250 is specially calibrated for 50 degrees Celsius high-ambient applications.
Which Siemens enclosures are compatible with the CFD63M250?
This bolt-on FD frame breaker is compatible with Siemens P2 and P3 panelboards, switchboards, and motor control centers.
What are the wire size requirements for the CFD63M250?
The load side lugs accept 6 AWG to 350 kcmil copper wire, or 4 AWG to 350 kcmil aluminum wire.
How is the trip unit configured on the CFD63M250?
This breaker uses a thermal-magnetic trip unit with LI functions. It features a fixed thermal setting for long-time overload protection and an adjustable magnetic setting for instantaneous short-circuit protection.
Does the CFD63M250 include lug terminals?
Yes, the breaker is supplied with load side lug terminals. Line side connections will depend on your specific panelboard or switchboard mounting hardware.
Why use a current-limiting breaker like the CFD63M250?
Current-limiting breakers clear faults extremely fast, typically within a half-cycle. This reduces the peak let-through current and thermal energy during a short circuit, minimizing potential damage to downstream components and improving overall system safety.
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