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Solid quality component. Exactly as described on the product page.
Maintenance team · Ontario
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Circuit Breaker
Siemens | QJ3B125A02 | Circuit Breaker | 125A | 3-Pole | 240V | Bolt-On
| Amperes | 125 |
| Poles | 3 |
| Voltage | 240 |
| Product Type | Circuit Breaker |
Regular price
$510.00
Sale price
$510.00
Regular price
Unit price
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Seamless online shopping experience guaranteed with easy shipping and returns policy.
Shop with Confidence: Our Products come with a Reliable Year-Long Warranty.
Siemens | QJ3B125A02 | Circuit Breaker | 125A | 3-Pole | 240V | Bolt-On
Regular price
$510.00
Sale price
$510.00
Regular price
Unit price
Product description
Shipping
Introducing the Siemens QJ3B125A02 Circuit Breaker — a rugged 125A, 3-Pole device crafted for 240V systems. Designed for maintenance, retrofit, and replacement projects, this bolt-on breaker delivers dependable overcurrent protection in demanding electrical panels.
Key specifications
- Amperage: 125A
- Poles: 3-Pole
- Voltage: 240V
- Mounting: Bolt-On
- Part Number: QJ3B125A02
What makes this bolt-on breaker stand out
Specifically engineered for bolt-on panels that require a secure, vibration-resistant connection, the QJ3B125A02 delivers consistent trip performance in three-phase environments. Its robust construction and precise trip characteristics help protect feeders and downstream equipment from overloads and short circuits, reducing downtime and maintenance costs in industrial and commercial settings.
Ideal use cases
- Maintenance swaps in existing 3‑phase, 240V electrical systems
- Retrofit projects where matching 125A, 3-pole bolt-on breakers are required
- Replacement of aging or failed breakers in service panels designed for bolt-on installation
Compatibility and installation notes
Confirm fit and ratings before ordering. The QJ3B125A02 part number is the best reference for compatibility with Siemens panels that accept bolt-on, 3-pole breakers at 240V. This helps ensure a seamless replacement without panel modification.
Practical tips for installation and use
- Power down the main and verify absence of voltage before any work
- Ensure your panel is designed for bolt-on breakers in the QJ3B family and supports a 125A, 3-pole configuration
- Install according to your panel’s instruction manual and follow standard electrical safety practices
- After mounting, verify proper alignment and that all mounting screws engage fully for secure operation
For professionals upgrading or maintaining three‑phase 240V circuits, the Siemens QJ3B125A02 delivers reliable protection with exact-fit compatibility, helping systems stay safe and operational.
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What Our Customers Say
General feedback we often hear from customers purchasing industrial electrical parts.
Verified
Packaging was secure and the item arrived clean and ready for installation.
Electrical contractor · GTA
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We’ve used this type on multiple jobs and it’s been reliable so far.
Panel shop · Canada/US
