Siemens | NGB3B070 | Circuit Breaker | 70A | 3-Pole | 347V

Secure, dependable protection for your 3‑phase distribution with the Siemens NGB3B070 circuit breaker. Engineered for maintenance, retrofit, and replacement, it delivers reliable overcurrent protection in commercial environments where 347V three‑phase power is standard. The NGB3B070 is the right fit when you need a genuine Siemens component with exact ratings to match existing equipment.

Key specifications

• Amperage: 70 A
• Poles: 3-Pole (3‑phase)
• Voltage rating: 347 V
• Part number: NGB3B070 (best compatibility reference)
• Applications: Maintenance, retrofit, and replacement within Siemens panels and compatible 347V systems

Ideal use cases

Deploy the NGB3B070 in commercial buildings with 347V distribution, on manufacturing lines featuring three‑phase motors, or during retrofit projects that require upgrading protection to Siemens standards. It serves as a precise, 70A protection point for branch circuits in systems where a three‑pole configuration ensures safe, simultaneous disconnection of all phases.

Compatibility and installation tips

• Always confirm fit by comparing the panel label and the NGB3B070 part number as the primary compatibility reference.
• Verify the system voltage is 347V and ensure the panel’s bus connections and mounting style align with this breaker.
• Ensure the breaker type and protective characteristics align with your overall protection scheme; if upgrading, make sure the panel’s ratings accommodate the 70A branch circuit and related fault-current requirements.

Why choose Siemens NGB3B070

As a genuine Siemens component, this 3‑pole 70A breaker guarantees seamless integration with your existing Siemens protection stack and reduces the risk of mismatches common with aftermarket parts. The three‑pole design guarantees simultaneous disconnection of all phases, enhancing safety for motors and other 3‑phase loads. The 347V rating makes it an ideal fit for commercial distribution networks that demand robust, reliable protection.

Practical guidance

Keep the breaker in its original packaging until installation, store in a dry environment, and rely on a qualified electrician for installation and testing. For aging installations, consider a coordinated review of adjacent protection devices to ensure consistent performance across the panel.