NGB3B070B - 70 Amp Circuit Breaker

NGB3B070B - 70 Amp Circuit Breaker

The Siemens NGB3B070B is a reliable, high-performance 70 A circuit breaker designed for both residential and commercial electrical systems. Built for panelboard-mounted applications, this three‑pole breaker delivers dependable protection against overloads and short circuits, combining precise thermal and magnetic trip mechanisms to safeguard critical circuits. Its compact form factor and broad compatibility make it a solid choice for a variety of installation settings—from homes and office buildings to light industrial spaces—ensuring consistent performance day in and day out.

Key Features and Benefits

• Strong Overcurrent Protection: With its thermal‑magnetic trip unit, the NGB3B070B responds accurately to sustained overloads and sudden short circuits, delivering peace of mind for safety‑critical circuits.
• High Fault‑Current Capacity: Rated for up to 14 kAIC at 600Y/347V and 25 kAIC at 480Y/277V, this breaker offers dependable fault‑current handling, ideal for systems where reliability matters most.
• Multi‑Pole Versatility: The 3‑pole configuration enables it to control three-phase circuits, making it suitable for a wide range of electrical setups.
• Broad Wiring Flexibility: Accommodates both copper and aluminum conductors from 8 AWG to 1/0 AWG, giving electricians flexibility during installation and upgrades.
• Compact Panelboard Fit: Its space-efficient design ensures it can slide into most standard panelboards and load centers, making upgrades and replacements straightforward.

Technical Specifications

• Ampere Rating: 70 A
• Number of Poles: 3
• Voltage Rating: 600Y/347V (14 kAIC) / 480Y/277V (25 kAIC)
• Frame Type: NGB
• Trip Unit: Thermal‑Magnetic
• Dimensions:
  • Width: 3.0 inches
  • Height: 5.4 inches
  • Depth: 2.8 inches
• Load Side Lugs: Yes (TC1GG20)
• Supported Wire Range: 8 AWG – 1/0 AWG (Copper or Aluminum)

Material Compliance and Certifications

• UL Listed: Meets the rigorous safety and performance standards established by Underwriters Laboratories.
• RoHS Compliant: Manufactured in accordance with the Restriction of Hazardous Substances directive to limit use of harmful materials.
• REACH Compliant: Conforms to chemical safety guidelines required under EU regulations, ensuring safe use of materials.
• WEEE Directive Ready: Meets criteria for responsible electronic waste recycling and take-back obligations.

Where It Works Best

• This circuit breaker shines in a variety of environments. It’s a great fit for residential electrical panels where homeowners need a dependable 70 A breaker for sub‑panels or heavy-load circuits. In commercial settings like offices, retail spaces, or small workshops, the three-pole configuration and high fault-current capacity offer reliable protection for three-phase systems. It’s also well suited for light industrial facilities or mixed-use buildings requiring flexible wiring options for both copper and aluminum. If you’re upgrading an existing panelboard or building a new electrical installation that needs steady, long-term circuit protection—this breaker delivers.