Siemens LGB3K025B Molded Case Circuit Breaker
- 25A
- 3 Pole
- Bolt-On
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Siemens LGB3K025B - 25A 3 Pole Molded Case Circuit Breaker
New
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Description
The Siemens LGB3K025B is a 3-pole, 25A molded case circuit breaker designed for commercial power distribution. Utilizing a fixed thermal-magnetic trip unit, it delivers reliable long-time and instantaneous protection. Engineered with a bolt-on mounting style, it fits seamlessly into Siemens P1, P2, and P3 panelboards. It replaces existing LGB frames, while the newer 3VA5125 serves as its substitute. Rated 65kAIC at 480Y/277V, it is HACR rated and features a trip-free mechanism for safety.Specifications
| Brand | Siemens |
|---|---|
| Series | LGB |
| Amperage | 25A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 25kA @ 600Y/347VAC, 14kA @ 125/250VDC |
| Frame Type | LGB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3 Panelboards |
| Wire Gauge | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Low Tab, Non-Interchangeable Trip, Trip-Free Mechanism |
Product FAQs
6 answersWhich Siemens panelboards are compatible with the LGB3K025B breaker?
This bolt-on breaker is designed specifically for installation in Siemens P1, P2, and P3 commercial panelboards. It is not compatible with standard plug-on load centers.
What wire sizes are accepted by the standard lugs on this breaker?
The factory-installed lugs accept 14 to 6 AWG copper wire or 12 to 6 AWG aluminum wire. Ensure proper torque specifications are followed during installation.
Can the LGB3K025B be used in DC voltage applications?
Yes, this thermal-magnetic breaker is rated for use in DC systems up to 125/250VDC, providing a 14kA interrupting capacity.
What is the short-circuit interrupting rating for this breaker on a 480V system?
It provides a 65kAIC rating at 480V and 480Y/277V, making it suitable for commercial and industrial distribution systems requiring high fault current protection.
How does the LGB3K025B mount into the panel?
It features a bolt-on connection type. It secures directly to the busbars of compatible Siemens commercial panelboards using bolted connections rather than a plug-in or DIN rail mount.
Is the trip unit on the LGB3K025B adjustable?
No, this breaker features a fixed thermal and fixed magnetic trip unit. It provides standard long-time and instantaneous protection without adjustable dials.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
- RSRon S.Verified BuyerReviewingSiemens LGB3B045B - 45A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/27/26Siemens Breaker
The breaker was exactly what I needed, and it came within a couple days. The price was in line of what it should’ve been. This was my third purchase from Super Breakers. I will definitely use them again in the future.