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Siemens LGB1B025B Molded Case Circuit Breaker
- 25A
- 1 Pole
- Bolt-On
Siemens
LGB1B025B
Molded Case Circuit Breaker
Brand
Siemens
SKU
LGB1B025B
Quantity
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Siemens LGB1B025B - 25A 1 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial power distribution, the Siemens LGB1B025B is a 1-pole, 25A molded case circuit breaker providing reliable thermal-magnetic protection. This bolt-on MCCB installs seamlessly into Siemens P1, P2, and P3 panelboards. Serving as a drop-in replacement for older GB/GG frame installations, it is the predecessor to the newer 3VA41 series. Rated for 65kAIC at 277VAC, the breaker features a low tab profile, HACR certification, and accepts 14-6 AWG copper wire.Specifications
| Brand | Siemens |
|---|---|
| Series | LGB |
| Amperage | 25A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 277VAC, 125VDC, 347VAC |
| Phase | 1 |
| AIC Rating | 100kA @ 120VAC, 65kA @ 277VAC, 14kA @ 125VDC, 14kA @ 347VAC |
| 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, Padlock Attachment, Handle Tie |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Trip-Free Mechanism, Non-Interchangeable Trip |
Product FAQs
8 answersWhich panelboards are compatible with the LGB1B025B circuit breaker?
This bolt-on molded case circuit breaker is designed for direct installation into Siemens P1, P2, and P3 panelboards.
Can the LGB1B025B replace older GB or GG frame circuit breakers?
Yes, the LGB frame serves as a drop-in replacement for legacy Siemens GB and GG frame installations in commercial distribution panels.
What wire sizes and materials are supported by the lugs on this breaker?
The factory lugs accept 14 to 6 AWG copper (Cu) wire and 12 to 6 AWG aluminum (Al) wire.
Is this breaker suitable for direct current (DC) applications?
Yes, it is rated for 125VDC with an interrupting capacity of 14kAIC, making it suitable for specific DC control and distribution circuits.
What does the LI trip function indicate on this breaker?
The LI designation means the breaker features fixed Long-Time (overload) and Instantaneous (short circuit) thermal-magnetic trip functions.
What is the modern equivalent or successor to the Siemens LGB frame?
The Siemens LGB frame is the predecessor to the newer Siemens 3VA41 series of molded case circuit breakers.
Does this breaker use a plug-in or bolt-on connection?
The LGB1B025B utilizes a bolt-on connection for secure mounting to the panelboard bus, which is standard for commercial P1, P2, and P3 panels.
Is the LGB1B025B HACR rated?
Yes, this breaker carries an HACR certification, meaning it is approved for use with heating, air conditioning, and refrigeration equipment.
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