Square D FHB16070B 70A 1-Pole 277 V Circuit Breaker

Power your commercial electrical panel with precision and reliability using the Square D FHB16070B 70A 1-Pole 277 V Circuit Breaker. This single-pole breaker provides targeted overcurrent protection for a single hot leg in 277-volt circuits, helping to prevent damage to wiring and equipment and to maintain safe, consistent operation in demanding environments. Part Number FHB16070B is designed to fit where a 70 A, 1-pole, 277 V device is required.

• Current rating: 70 A
• Poles: 1
• Voltage rating: 277 V
• Brand/line: Square D FHB family

What makes the Square D FHB16070B special

Beyond the basic specs, this circuit breaker is built to integrate seamlessly with Square D panels and FHB-compatible configurations. The 1-pole design makes it ideal for protecting a single hot conductor in 277-volt circuits—common in commercial lighting and power distribution—while the 70-amp rating supports substantial load while staying within panel capacity. Using this model helps maintain electrical safety, prevents nuisance trips on normal startup surges, and offers predictable, repeatable protection across installations that use 277 V systems.

Ideal use cases

• 277 V lighting circuits in offices, retail spaces, and industrial facilities that require single-pole protection.
• Branch circuits feeding equipment or equipment rooms where a 70 A protection device is appropriate.
• Repairs or replacements in panels that already use the FHB16070B or compatible FHB-series breakers.

Tips for installation and operation

Ensure the breaker is the correct type for your Square D panel and that the electrical load does not exceed the 70 A rating. When performing installations or replacements, verify that line and load connections are secure and that the panel remains de-energized during work. This 277 V circuit breaker is designed to handle commercial and industrial environments where reliable overcurrent protection is needed for a single hot leg.