Siemens NEB2B090B - 90 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens NEB2B090B is a 90A, 600V, 2-pole bolt-on molded case circuit breaker designed for dependable branch circuit protection in panelboards and load centers. Built to endure the demands of real-world electrical systems, this unit combines robust hardware with precise protection to keep circuits safe and uninterrupted.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, helping maintain consistent electrical contact even in demanding environments.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance against overcurrent and short circuits, reducing nuisance trips and improving system reliability.
• OEM-ready compatibility is designed to work with matching Siemens OEM load centers and panelboards, ensuring seamless integration and electrical harmony with existing infrastructure.
• Versatile applications suitable for residential, commercial, and light industrial installations, delivering reliable protection where it’s needed most.

Technical Specifications

• Manufacturer: Siemens
• Part Number: NEB2B090B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 90A
• Voltage Rating: 600V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

This 2-pole, 90A bolt-on breaker is ideal for upgrading or replacing legacy protection in panelboards and loadcenters where a secure, vibration-resistant connection and predictable trip behavior are essential. By leveraging Siemens’ thermal-magnetic technology and a bolt-on design, it helps maintain electrical safety while simplifying installation in both new builds and equipment refurbishments.

Use cases and benefits

• Upgrading residential service panels to improve continuity and protection for critical circuits
• Integrating with Siemens OEM load centers for streamlined commissioning and reliable performance
• Protecting feeders and branch circuits in light commercial and light industrial environments
• Replacing aging breakers where a durable bolt-on solution is required to handle vibration or panel movement

Installation tips and considerations

• Verify panel compatibility with Siemens OEM panels and ensure correct form factor for bolt-on mounting
• Follow the installer’s guide for torque specification on bolt-on connections to maintain a secure, rated bus contact
• Use in accordance with electrical codes and safety practices for branch circuit protection and short-circuit defense
• Keep the system’s voltage and environmental conditions within the 600V rating and suitable application guidelines