Siemens
Siemens NGB3B125 Miniature Circuit Breaker — 125A 240V AC
Siemens NGB3B125 3-Pole Miniature Circuit Breaker (MCB)
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12-Mo Warranty
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12-month warranty
All units tested
Same-day dispatch
Order by 2pm CST
Worldwide delivery
US, EU, Asia, Middle East
Veteran-owned
CAGE: 9NK75
125A high current rating
Three-pole design
Thermal-magnetic trip
Robust industrial construction
DIN rail mounting
Product description
The Siemens NGB3B125 is a high-amperage, three-pole miniature circuit breaker designed for heavy-duty overcurrent protection in 240V AC industrial applications. It features a 125A rating and a dependable thermal-magnetic trip mechanism.
This 3-pole breaker is engineered for main disconnects, large motor circuits, and demanding industrial power distribution systems. It offers crucial safety by protecting equipment from damaging overloads and short circuits.
Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens NGB3B125. We specialize in providing reliable industrial automation components to support your critical infrastructure.
Technical specifications
| Voltage | 240V AC |
| Current | 125A |
| Poles | 3 |
| Trip Type | Thermal-Magnetic |
| Series | NGB |
| Mounting | DIN Rail |
Common applications
Industrial main disconnects
Large motor protection
Heavy industrial power distribution
High-capacity panels
Sub-distribution
Compatible systems
Heavy-duty industrial power distribution
3-phase AC systems
Main panel feeders
Standard DIN rail systems
Also known as
Siemens NGB3B125 breaker
NGB3B125 MCB
Siemens 125A 3-pole breaker
NGB 125A breaker
Replaces / compatible with
This high-amperage 3-pole circuit breaker from the Siemens NGB series is suitable for main feeders and heavy-duty circuits in industrial settings.
Technical note
Expert tip
Ensure the power source and wiring are appropriately sized for a 125A breaker to avoid conductor damage before the breaker trips.What happens next?
1
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Immediate receipt acknowledgment sent to you
2
Account manager assigned
Confirms your part's spec and condition
3
Your quote delivered
Tailored to your specific requirements
Frequently asked questions
What is the interrupting capacity of the Siemens NGB3B125?
While specific interrupting capacity (AIC) ratings can vary slightly by exact model revision and region, Siemens NGB series breakers are designed to meet industry standards for fault interruption. For precise AIC, consult the product datasheet or label.