Square D FH16020B - 20 A, 277 V, 3-Pole Plug-In Circuit Breaker | AmpState

Square D FH16020B is a 20A, 277V, 3-pole plug-in molded case circuit breaker designed for reliable overcurrent and short-circuit protection in panelboards and load centers. Built to meet OEM specifications, this unit ensures safe, predictable performance for a range of electrical systems from homes to light commercial installations.

Designed for fast, straightforward installation and field replacement, the FH16020B features a plug-in connection that simplifies servicing and minimizes downtime on busy electrical panels. The thermal-magnetic trip unit delivers stable, repeatable protection: the thermal element guards against nuisance trips on gradual load increases, while the magnetic element rapidly interrupts severely faulted conditions, helping protect wiring and equipment from damage.

This 3-pole design is ideal for 277V circuits and multi-wire configurations commonly found in commercial and light industrial environments. Its compatibility with matching OEM load centers and panelboards ensures a safe, listed pairing that installers can trust for compliant panel assemblies.

• Fast plug-in installation for quick upgrades, replacements, or panel refurbishments
• Thermal-magnetic protection provides dependable performance across varying loads
• 277V, 3-pole design suitable for multi-phase or multi-wire circuits
• OEM-compatible with Square D load centers and panelboards for certified pairing
• Versatile applications—residential, commercial, and light industrial electrical systems

Who should consider the FH16020B? Electricians planning panel upgrades, contractors wiring multi‑circuit commercial spaces, or facilities managers maintaining light industrial equipment where reliable branch-circuit protection at 277V is required. It’s especially advantageous when you need a quick, code-compliant replacement that won’t disrupt ongoing operations.

Practical usage tips: - Verify the panelboard compatibility ahead of installation to ensure a seamless plug-in fit. - Use the 3-pole design where multi-phase protection is necessary to guard interconnected loads. - Pair with appropriate feeders and conductors sized for 20A circuits to maintain proper protection coordination. - Keep spare FH16020B breakers on hand for fast replacements during preventive maintenance or emergency servicing.

Technical specifications: - Manufacturer: Square D - Part number: FH16020B - Type: Thermal-magnetic molded case circuit breaker - Amperage rating: 20A - Voltage rating: 277V - Number of poles: 3 - Mounting style: Plug-in - Application: Branch circuit overcurrent and short-circuit protection