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Siemens LGB3B045B Molded Case Circuit Breaker
- 45A
- 3 Pole
- Bolt-On
Siemens
LGB3B045B
Molded Case Circuit Breaker
Brand
Siemens
SKU
LGB3B045B
Quantity
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Siemens LGB3B045B - 45A 3 Pole Molded Case Circuit Breaker
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Description
Designed for Siemens P1, P2, and P3 panelboards, the LGB3B045B is a 3-pole, 45-amp molded case circuit breaker from the Sentron GB frame family. It delivers reliable thermal-magnetic protection with fixed long-time and instantaneous (LI) trip functions. Built for commercial and industrial use, it boasts a 100kAIC rating at 240VAC and 65kAIC at 480Y/277VAC. For modern upgrades, this unit is replaced by the 3VA5145-6ED31-0AA0, which requires a mounting kit for P1 panels.Specifications
| Brand | Siemens |
|---|---|
| Series | LGB |
| Amperage | 45A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 14kA @ 600Y/347VAC, 14kA @ 125/250VDC |
| Frame Type | LGB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3 Panelboards |
| Wire Gauge | 8-1/0 AWG (Cu), 8-2/0 AWG (Al) |
| Max Wire | 1/0 AWG (Cu), 2/0 AWG (Al) |
| Min Wire | 8 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, NEMA AB 1, UL 489 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Reverse Feed, Trip-Free Mechanism, Common Trip |
Product FAQs
6 answersCan I install the LGB3B045B in a standard residential load center?
No, the LGB3B045B is a bolt-on molded case circuit breaker designed specifically for Siemens P1, P2, and P3 commercial panelboards. It will not fit in standard plug-on residential load centers.
What wire sizes and materials are compatible with the lugs on this breaker?
The factory lugs accept 8 AWG to 1/0 AWG copper wire, or 8 AWG to 2/0 AWG aluminum wire. Ensure proper torque specifications are followed during installation.
What does the LI trip function mean on the LGB3B045B?
The LI designation indicates a thermal-magnetic trip unit with Long-Time (L) and Instantaneous (I) protection. The Long-Time function protects against sustained overloads, while the Instantaneous function trips immediately during a short circuit. Both settings are fixed on this frame.
Is this breaker suitable for DC applications?
Yes, the LGB3B045B is rated for use in DC systems up to 125/250VDC, providing a 14kA interrupting capacity for these applications.
What is the difference between the LGB, NGB, and HGB frames?
These frames share the same physical dimensions and panelboard compatibility but offer different interrupting ratings. The LGB is the standard interrupting capacity version, while NGB and HGB models provide higher short-circuit ratings for more demanding applications.
Does this breaker include ground fault or arc fault protection?
No, the LGB3B045B provides standard thermal-magnetic overcurrent and short-circuit protection. It does not include GFCI or AFCI functionality.
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