Square D EGB16050 - 50 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D EGB16050 — a 50A, 277V, 1-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and load centers. Built for power reliability in busy commercial spaces and demanding residential setups, this breaker helps keep circuits safe from overcurrent and short-circuit events.

Why this breaker stands out

• provides a secure, vibration-resistant bus connection, reducing the risk of loose connections in environments with equipment movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining a thermal element for gradual overloads with a magnetic mechanism for immediate response to short circuits.
• 31-compatibility with OEM panels designed to pair with matching Square D load centers and panelboards, ensuring a clean fit and reliable performance.
• 50A at 277V—well-suited for feeder or branch circuits in commercial lighting, small motors, pumps, and HVAC control circuits, as well as residential distribution panels.

Designed for real-world use

This 1-pole molded case breaker is ideal for installations where space, reliability, and mounting security matter most. In panelboards and load centers, it provides decisive protection for a single live conductor, isolating faults quickly to minimize damage and downtime. The bolt-on design is especially advantageous in panels exposed to vibration or where a solid, durable connection is critical for long-term performance.

Who benefits most

Electricians upgrading panelboards, facilities managers overseeing commercial spaces, and tradespeople installing or replacing feeders in light industrial environments will appreciate the combination of secure mounting, predictable trip behavior, and OEM compatibility. It’s a practical choice for retrofit projects and new installations that require a proven, plug-compatible solution.

Use cases and scenarios

• Replacing a failed 1-pole breaker in existing Square D panelboards or load centers that require a 50A, 277V device.
• Feeding commercial lighting circuits or small-motor equipment where reliable 277V protection is essential.
• Retrofits in residential or light commercial spaces where vibration or movement could affect connections and long-term reliability.

Performance and practicality

With its thermal-magnetic trip, the EGB16050 provides a balanced response: it minimizes nuisance trips from gradual surges while acting decisively on dangerous faults. This translates to fewer service calls, quicker fault isolation, and better continuity for critical loads. The molded-case construction supports consistent interrupting performance across environments, making it a durable choice for panels that service everyday life and business operations.

Specifications at a glance

• Manufacturer: Square D
• Part Number: EGB16050
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 50A
• Voltage Rating: 277V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection