Siemens | NPX3B140 | Circuit Breaker | 3-Pole | Bolt-On

Siemens NPX3B140 is a rugged 3-pole bolt-on circuit breaker designed for reliable protection in maintenance, retrofit, and replacement projects. When your goal is to match existing equipment exactly, this Siemens part delivers the precise specifications you need to keep your electrical system safe and compliant.

Key features

• Poles: 3-Pole bolt-on design for secure, end-to-end three-phase protection
• Part number NPX3B140 provides a definitive reference for compatibility and replacement accuracy
• Engineered for scenarios where matching specs are essential—maintenance, retrofit, and replacement applications

Compatibility and ordering guidance

Before purchasing, verify fit and ratings to ensure seamless integration with your current panel or switchgear. The NPX3B140 part number is the most reliable reference for confirming compatibility, reducing the risk of mismatched components and downtime.

Use cases and practical applications

• Maintenance: Replace a worn or failing breaker with the exact Siemens NPX3B140 to restore normal operation without altering panel wiring or mounting constraints.
• Retrofit: Upgrade or reconfigure a three-phase panel by adding a bolt-on 3-pole circuit breaker that matches existing specifications.
• Replacement: Stock the NPX3B140 as a genuine spare to minimize outage time when a circuit breaker needs immediate replacement.

Why choose the Siemens NPX3B140

Opting for a genuine Siemens NPX3B140 means you’re sourcing a part designed to align with Siemens’ engineering standards and your panel’s mount and clearance geometry. The bolt-on design simplifies installation, providing a solid mechanical connection that supports dependable electrical protection across three-phase systems. This isn’t a generic substitute—it's a precise, compatible part intended to protect your equipment and keep your operation running smoothly.

Tips for best results

• Cross-check the panel catalog or service manual to confirm that NPX3B140 is the exact match for your equipment
• Keep spare NPX3B140 on hand for planned maintenance and emergency replacements to minimize downtime
• Handle and install with proper de-energization procedures to ensure safety and proper operation of the bolt-on mount