Siemens HGB1B070B 70A 1-Pole 347 V Circuit Breaker Potential Transformer

The Siemens HGB1B070B is a purpose-built circuit breaker designed for 347-volt networks. This 70 A, 1-pole device delivers dependable overcurrent protection for critical feeders and is crafted to work seamlessly with protection schemes that leverage potential transformers for accurate sensing and metering in modern electrical panels.

• Part number: HGB1B070B
• Current rating: 70 A
• Poles: 1
• Voltage rating: 347 V

Why choose this Siemens breaker? It combines a compact single-pole form factor with a targeted protection profile for 347 V systems—common in commercial buildings and light industrial settings. With potential transformer compatibility, it supports integrated protection and metering workflows, helping your protection relays and meters coordinate fast, selective trips that minimize downtime and protect essential equipment.

Ideal applications

• Feeder protection in 347 V commercial electrical rooms and switchgear
• Single-pole protection within three-phase distributions that use 347 V as the system specification
• Retrofit or replacement in Siemens panels that require PT-compatible protection

Installation and maintenance tips

• Verify system voltage and panel compatibility before installation
• Ensure connections are clean and torqued according to Siemens guidelines
• Schedule regular functional checks within your preventive maintenance plan to confirm reliable tripping behavior

For engineers and technicians designing resilient electrical infrastructure, the Siemens HGB1B070B delivers precise, PT-ready protection that aligns with modern metering and relay-based protection schemes. It’s a thoughtful choice for ensuring dependable, safe operation in 347 V circuits.