Square D 120/277VOLT - 20A, 1-Pole, Circuit Breaker

Square D 120/277V, 20A, 1-Pole Circuit Breaker is engineered to deliver dependable overcurrent protection for single-phase circuits in demanding environments. With a 20 amp current rating and a compact 1-pole design, this breaker is a versatile choice for panelboards, switchboards, and control panels where space and reliability matter.

Designed for industrial, commercial, and OEM applications, it provides precise interruption to protect your distribution panels and motor control centers from overloads and short circuits. The 120/277V rating expands its utility across mixed-voltage installations, making it suitable for both traditional 120V branch circuits and 277V lighting circuits commonly found in commercial settings.

Key specifications

• Current rating: 20 A
• Poles: 1-Pole
• Voltage: 120/277 V
• Breaker type: Circuit Breaker

Applications and benefits

In everyday operation, this breaker protects individual branch circuits within panelboards, switchboards, and control panels, helping prevent damage from overloads and faults. Its single-pole configuration offers flexible integration in compact or segmented panel layouts, supporting reliable protection without unnecessary footprint expansion. Ideal for commercial lighting, general-purpose outlets, and small motor loads within industrial facilities and OEM equipment enclosures.

Why choose Square D for overcurrent protection

• Proven performance in distribution panels and motor control centers, backed by Square D’s engineering lineage.
• Compact, 1-pole design that simplifies panel planning and replacement in crowded electrical spaces.
• Clear, targeted protection for single-phase circuits, reducing risk of nuisance trips and safeguarding critical equipment in busy environments.

Whether you’re outfitting new equipment or upgrading an aging panel, the Square D 120/277V, 20A, 1-Pole Circuit Breaker delivers precise, reliable protection where it’s needed most—across industrial, commercial, and OEM applications.