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Siemens LGB2B040B Molded Case Circuit Breaker
- 40A
- 2 Pole
- Bolt-On
Siemens
LGB2B040B
Molded Case Circuit Breaker
Brand
Siemens
SKU
LGB2B040B
Quantity
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Siemens LGB2B040B - 40A 2 Pole Molded Case Circuit Breaker
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Description
Delivering reliable power distribution, the Siemens LGB2B040B is a 40A, 2-pole molded case circuit breaker. It features a trip-free mechanism and thermal-magnetic protection to safeguard commercial circuits. Designed for secure installation, this bolt-on MCCB fits into Siemens P1, P2, and P3 panelboards. The breaker boasts an impressive 100 kAIC rating at 240V and 65 kAIC at 480Y/277V. It is HACR and HID rated, making it highly versatile for specialized lighting and HVAC loads.Specifications
| Brand | Siemens |
|---|---|
| Series | LGB |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 1 |
| 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, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Trip-Free Mechanism |
Product FAQs
6 answersWhich Siemens panelboards are compatible with the LGB2B040B circuit breaker?
This bolt-on breaker is designed for use in Siemens P1, P2, and P3 panelboards. It mounts directly to the panelboard bus using bolted connections.
What are the acceptable wire sizes for the load side lugs on the LGB2B040B?
The factory-installed load lugs accept 8 to 1/0 AWG copper wire or 8 to 2/0 AWG aluminum wire. Ensure proper torque specifications are followed during installation.
Can the LGB2B040B be used in DC voltage systems?
Yes, this thermal-magnetic breaker is rated for DC applications. It provides an interrupting capacity of 14kA at 125/250VDC, in addition to its standard AC ratings.
Are the trip settings on the LGB2B040B adjustable?
No, this breaker features a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous protection functions are factory set and cannot be modified in the field.
What frame size is the Siemens LGB2B040B?
It belongs to the Siemens GB/GG frame family, specifically the LGB frame. This is a compact molded case circuit breaker designed for panelboard integration.
How does the interrupting rating change between 240V and 480V systems?
When installed in a 480V or 277V AC system, the breaker delivers a 65kA interrupting rating. For 240V AC systems, the maximum interrupting rating increases to 100kA.
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