Siemens LFG3B250L Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Quantity
Siemens LFG3B250L - 250A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Designed for high-fault environments, the Siemens LFG3B250L is a 3-pole, 250A molded case circuit breaker belonging to the VL Series. As an L-Class FG frame breaker, it provides superior current-limiting capabilities with a 100 kAIC rating at 480VAC. The unit utilizes a reliable thermal-magnetic trip mechanism for long-time and instantaneous (LI) protection. It installs into Siemens power panelboards, though it has been superseded by the 3VA5225-7EC31-0AA0 for newer builds.Specifications
| Brand | Siemens |
|---|---|
| Part Number | LFG3B250L |
| Series | LFG |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 100kA @ 480VAC, 25kA @ 600VAC, 35kA @ 500VDC |
| Frame Type | FG |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens VL Series Enclosures, Switchboards, Power Panelboards |
| Wire Gauge | 6 AWG - 350 kcmil (Al/Cu) |
| 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 | Line and Load Lugs Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, HACR, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Interchangeable Trip Unit |
Product FAQs
7 answersWhat does the LFG3B250L catalog number breakdown indicate?
The first "L" designates the very high L-Interrupting Class. "FG" represents the frame size. "G" indicates a global, interchangeable trip design. "3" is for three poles, "B" specifies a thermal-magnetic trip unit, "250" is the amperage, and the final "L" means it is a factory-assembled breaker with standard line and load lugs.
Is the Siemens LFG3B250L suitable for DC applications?
Yes, this breaker is rated for up to 500VDC with a 35kA interrupting capacity. Siemens specifies that thermal-magnetic trip units, like the one in the LFG3B250L, must be used for DC applications rather than electronic trip units.
How does the adjustable magnetic trip function on the LFG3B250L?
The breaker uses a fixed thermal element for standard overload protection and an adjustable magnetic element for short-circuit protection. The instantaneous magnetic trip features multiple adjustment settings, allowing electricians to fine-tune the trip point based on inrush currents or specific load requirements.
What equipment is the LFG3B250L designed to be installed in?
This FG frame breaker is designed for unit mounting in Siemens VL Series enclosures, switchboards, and power panelboards.
What wire sizes are accepted by the standard lugs on the LFG3B250L?
The factory-installed standard lugs accept aluminum or copper wire ranging from 6 AWG to 350 kcmil. Ensure proper torque is applied during installation as specified on the breaker label.
Can the trip unit on the LFG3B250L be swapped out?
Yes, the "G" in the catalog number indicates that this breaker features an interchangeable trip unit design. This allows the trip unit to be replaced or upgraded without removing the entire breaker frame from the panel.
Can the LFG3B250L be reverse fed?
No. Siemens specifies that for reverse feed applications, a non-interchangeable trip breaker must be used. Because the LFG3B250L features an interchangeable trip unit (indicated by the "G" in the catalog number), it is not suitable for reverse feeding.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.