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Siemens NGG3B125L Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Siemens
NGG3B125L
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGG3B125L
Quantity
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Siemens NGG3B125L - 125A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial power distribution, the Siemens NGG3B125L is a 3-pole, 125A molded case circuit breaker. It provides essential overcurrent defense for demanding electrical systems. This unit mount MCCB installs into Siemens enclosures, control panels, and switchboards. It is DIN rail mountable and serves as a legacy replacement, with the 3VA5112-4EC31-0AA0 acting as its modern substitute. Rated for 25kAIC at 480VAC, it features fixed thermal magnetic trip and reverse feed capability.Specifications
| Brand | Siemens |
|---|---|
| Series | NGG |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 120VAC, 240VAC, 480VAC, 600Y/347VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 120VAC, 65kA @ 240VAC, 25kA @ 480VAC, 14kA @ 600Y/347VAC, 14kA @ 125/250VDC |
| Frame Type | NGG |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Enclosures, Control Panels, Switchboards, DIN Rail |
| 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, Undervoltage Release |
|---|---|
| Accessories | Line and Load Lugs Included (TC1GG20) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, HACR, NOM, UL |
| Temp Rating | 40C |
Product FAQs
6 answersDoes the Siemens NGG3B125L include terminal lugs?
Yes, the L suffix in the catalog number indicates that this breaker comes standard with factory-installed lugs on both the line and load sides.
How is the NGG3B125L breaker mounted in a panel?
This is a unit-mount, feed-thru breaker. It does not plug into a busbar. Instead, it is designed to be screw-mounted to a backpan or snapped onto a standard DIN rail inside compatible enclosures and control panels.
Can the NGG3B125L be installed in a standard residential load center?
No, the NGG frame is a commercial and industrial molded case circuit breaker. It is designed specifically for unit mounting in control panels, switchboards, and DIN rail applications, and will not fit into standard residential plug-on load centers.
Is this breaker HACR rated for HVAC equipment?
Yes, the NGG3B125L carries an HACR rating, meaning it is approved to handle the specific inrush currents and operational demands of heating, air conditioning, and refrigeration multi-motor circuits.
What is the modern replacement for the NGG3B125L?
The NGG3B125L is a legacy Siemens breaker. If you are looking to upgrade to the current generation, the Siemens 3VA5112-4EC31-0AA0 serves as its direct modern substitute.
Can the NGG3B125L be reverse fed?
Yes, this thermal-magnetic breaker features reverse feed capability, providing flexibility for wiring the line and load connections in control panels or switchboards.
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