Siemens LDG2B125L Molded Case Circuit Breaker
- 125A
- 2 Pole
- Unit Mount
Quantity
Siemens LDG2B125L - 125A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for heavy-duty industrial distribution, the Siemens LDG2B125L is a 2-pole, 125A molded case circuit breaker from the advanced VL Series. This DG frame unit features L-Class interrupting capacity, offering an exceptional 100 kAIC rating at 480VAC for robust current-limiting performance. Equipped with a thermal-magnetic trip unit for precise LI protection, it mounts into Siemens P4 and P5 panelboards. Note that this model is replaced by the 3VA5212-7ED61-0AA0.Specifications
| Brand | Siemens |
|---|---|
| Part Number | LDG2B125L |
| Series | LDG |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600Y/347VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 200kA @ 240VAC, 100kA @ 480VAC, 18kA @ 600Y/347VAC, 30kA @ 250VDC |
| Frame Type | LD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards, VL Series Enclosures |
| Wire Gauge | 8 AWG - 1/0 AWG (Cu/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, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Line and Load Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, Interchangeable Trip Unit, HACR Rated |
Product FAQs
6 answersWhich Siemens panelboards are compatible with the LDG2B125L breaker?
This VL series breaker is designed for use in Siemens P4 and P5 panelboards, as well as compatible Siemens switchboards and VL series enclosures.
What wire sizes are accepted by the lugs on this breaker?
The load side lugs accept wire gauges from 8 AWG up to 1/0 AWG. Both copper (Cu) and aluminum (Al) conductors are supported.
What does the LI trip function indicate on this VL frame breaker?
The LI designation means the thermal-magnetic trip unit provides Long-Time (L) overload protection and Instantaneous (I) short-circuit protection. The thermal element is fixed, while the magnetic trip threshold is adjustable.
Is the LDG2B125L rated for direct current (DC) systems?
Yes, this breaker is rated for DC applications up to 250V DC, providing an interrupting capacity of 30kA at that voltage.
How is the LDG2B125L installed into a panelboard?
This is a unit mount, bolt-on circuit breaker. It bolts directly to the chassis or bus of compatible P4 and P5 panelboards or switchboards rather than snapping into place.
How does the adjustable magnetic trip improve system protection?
The adjustable magnetic setting allows electricians to fine-tune the instantaneous short-circuit response based on the specific fault current calculations of the downstream circuit, improving selective coordination.
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