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Siemens CFD63B250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Bolt-On
Siemens
CFD63B250
Molded Case Circuit Breaker
Brand
Siemens
SKU
CFD63B250
Quantity
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Siemens CFD63B250 - 250A 3 Pole Molded Case Circuit Breaker
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Description
Delivering exceptional fault current reduction, this 250A circuit breaker belongs to the Siemens Sentron series. The 3-pole FD-frame device is engineered for industrial facilities. It features a bolt-on mounting style for secure installation into Siemens P2 and P3 panelboards. The required TA1FD350A lug kits must be purchased separately. With a 200 kAIC capacity at 480V, the current-limiting architecture protects downstream equipment. It includes a thermal-magnetic trip unit.Specifications
| Brand | Siemens |
|---|---|
| Part Number | CFD63B250 |
| 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 |
| Frame Type | CFD |
|---|---|
| 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, Lug Kits |
|---|---|
| Accessories | Lugs not included (Requires TA1FD350A) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, HACR Rated, Non-Interchangeable Trip, Trip-Free Mechanism |
| Special Features | Current Limiting |
Product FAQs
7 answersWhich panelboards and enclosures are compatible with the Siemens CFD63B250?
The CFD63B250 is a bolt-on FD frame breaker designed for use in Siemens P2 and P3 panelboards, as well as compatible switchboards and motor control centers.
Are lugs included with the CFD63B250 circuit breaker?
No, the CFD63B250 is typically supplied without lugs. You will need to purchase compatible FD frame lug kits separately, such as the TA1FD350A for aluminum or copper wire, or the TC1FD350 for copper wire only.
What does the current limiting designation mean for the CFD63B250?
As a current limiting breaker, the CFD63B250 is designed to clear severe short circuits extremely fast, typically within a half cycle. This reduces the peak let-through current and energy, providing enhanced protection for downstream equipment and allowing for its high 200kAIC rating at 480VAC.
How is the trip unit configured on the CFD63B250?
This breaker features a thermal magnetic trip unit with a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short circuit protection. The magnetic trip can be adjusted via a dial on the front of the breaker to coordinate with downstream loads.
What wire sizes are supported by the standard TA1FD350A lugs for this breaker?
When equipped with TA1FD350A lugs, the breaker accepts 6 AWG to 350 kcmil copper conductors or 4 AWG to 350 kcmil aluminum conductors.
Can the CFD63B250 be used in DC applications?
Yes, in addition to its AC ratings, the CFD63B250 is rated for use in DC systems up to 500VDC, where it provides an interrupting capacity of 30kAIC.
What safety precautions should be taken when installing this bolt-on breaker?
Always ensure the panelboard or switchboard is completely de-energized before installation. Verify that the bolt-on connections to the busbars and the lug terminals are torqued to the manufacturer specifications to prevent arcing or overheating.
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