Siemens | NGB1B090B | Circuit Breaker | 1-Pole | 347V

Meet the Siemens NGB1B090B—a precise, OEM 1-pole circuit breaker engineered for 347V systems. Built for maintenance, retrofit, and replacement projects, this part reflects Siemens’ exacting standards for fit, function, and long‑term reliability. When you need to preserve the original protection scheme in your panel, this is the part to trust.

Key specifications at a glance

• Poles: 1-Pole
• Voltage rating: 347V
• Part number: NGB1B090B
• Application: Maintenance, retrofit, and replacement where matching specs are required

Why choose the NGB1B090B for your panel

This Siemens circuit breaker is not just a drop‑in replacement—it’s a guaranteed fit that preserves the original electrical protection characteristics of your system. Using the exact part number ensures compatibility with Siemens panels and downstream components, helping you maintain safety, warranty compliance, and consistent trip behavior.

Ideal use cases

• Routine maintenance on commercial or industrial panels that require 1-pole protection at 347V
• Retrofit projects where the existing breaker matches the NGB1B090B specifications
• Replacement of a failed or worn 1-pole breaker in systems designed for 347V operation

How to verify compatibility

Before ordering, confirm the fit and ratings by cross‑checking your panel label and the part number. The NGB1B090B is designed to be the best reference for compatibility, so using the exact part number is your most reliable step. If your panel documentation lists NGB1B090B or requires a 1-pole breaker rated for 347V, you’re aligned.

Practical guidance for installers

• Review panel labeling to ensure voltage and pole requirements match 347V single‑pole protection
• Keep records of the replacement part number (NGB1B090B) for future maintenance and warranty validation
• Handle with standard electrical safety procedures and verify the circuit is de-energized during replacement

Whether you’re maintaining an established Siemens installation, upgrading to preserve original protection parameters, or completing a retrofit with trusted Siemens components, the NGB1B090B delivers dependable, field‑proven performance. Add this exact 1‑pole, 347V circuit breaker to your cart to ensure precise compatibility and streamlined maintenance workflows.