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Siemens LGB3B100B Molded Case Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Siemens
LGB3B100B
Molded Case Circuit Breaker
Brand
Siemens
SKU
LGB3B100B
Quantity
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Siemens LGB3B100B - 100A 3 Pole Molded Case Circuit Breaker
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Description
Delivering dependable thermal-magnetic protection, the Siemens LGB3B100B is a 3-pole, 100A molded case circuit breaker. It is designed for demanding commercial and industrial environments. The unit installs into Siemens P1, P2, and P3 panelboards using a secure bolt-on connection. For facilities updating their infrastructure, this breaker is replaced by the 3VA5110-6ED31-0AA0. It features an impressive 100kAIC rating at 240VAC, load side lugs, a trip-free mechanism, and HACR certification.Specifications
| Brand | Siemens |
|---|---|
| Part Number | LGB3B100B |
| Series | LGB |
| Amperage | 100A |
| 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 |
| 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 |
| 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 Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Low Tab, Reverse Feed, Trip-Free Mechanism, Non-Interchangeable Trip |
Product FAQs
8 answersWhich panelboards accept the Siemens LGB3B100B circuit breaker?
This breaker is designed for bolt-on installation in Siemens P1, P2, and P3 series distribution panelboards and switchboards. It requires the appropriate mounting kit or direct busbar connection intended for GB-frame breakers.
Can the LGB3B100B replace an NGB3B100B or HGB3B100B?
Yes. The LGB3B100B shares identical physical dimensions and bolt-on configurations with the rest of the GB-frame family. It provides a higher interrupting rating of 65kA at 480VAC, making it a direct drop-in upgrade over the standard NGB (25kA) and high-interrupt HGB (35kA) models.
Is the LGB3B100B rated for direct current (DC) systems?
Yes. Alongside its standard AC ratings, this thermal-magnetic breaker provides a 14kA interrupting capacity at 125/250VDC. This makes it suitable for specific DC control circuits, battery backups, and heavy-duty industrial DC distribution.
Is this circuit breaker rated for reverse feed applications?
Yes. The Siemens LGB3B100B is UL Listed for reverse feed operations. This permits its use as a back-fed main breaker in compatible electrical panels where allowed by local electrical codes.
What wire sizes and materials can be landed on the lugs?
The factory-installed load lugs accept 8 to 1/0 AWG copper wire or 8 to 2/0 AWG aluminum wire. Always tighten the terminal lugs to the exact torque specifications printed on the breaker label to ensure a secure connection and prevent thermal failure.
Does the LGB3B100B carry an HACR rating?
Yes. This GB-frame series breaker is HACR rated, meaning it is certified and approved for use with heating, air conditioning, and refrigeration equipment that requires specialized overcurrent protection.
What are the known alternate part numbers for this breaker?
You may see this breaker referenced by its UPC 887621220334, or as ITE LGB3B100B, which reflects the legacy brand name prior to full integration under Siemens.
Can this breaker be installed in a residential load center?
No. The LGB3B100B is a commercial and industrial bolt-on breaker. It will not physically fit or safely connect to the busbars found in standard residential load centers.
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