Square D FH17020B Circuit Breaker, 20A, 1-Pole, 277V

Meet the Square D FH17020B, a purpose-built circuit breaker for demanding industrial environments. With a 20-amp rating and 1-pole design, it protects single-phase circuits operating at 277V, delivering targeted interruption where it's needed most — from lighting runs to dedicated machine feeds.

• Amperage: 20 A
• Pole configuration: 1-pole
• Voltage rating: 277 V
• Part number: FH17020B
• Brand: Square D

The FH17020B stands out for industrial service, maintenance, and replacement workflows where space is tight and reliability is critical. Its single-pole format lets you protect individual circuits without unnecessary redundancy, making it ideal for 277V lighting circuits or specific equipment feeds within larger panels.

Why verify compatibility by part number: Use FH17020B to confirm fit with your panel and application requirements. Compatibility depends on the panel style, mounting method, and electrical envelope. If you’re unsure, send us the part number and application details and we’ll help verify fit and suggest the best replacement strategy.

Ideal use cases:

• Replacing an aging breaker in industrial control panels or MCCs
• Upgrading emergency lighting or dedicated equipment feeds operating at 277V
• Stocking a reliable 20A, 1-pole breaker for planned maintenance projects

Practical considerations:

• Always isolate power and follow lockout/tagout procedures before replacing a breaker.
• Ensure the panel’s bus, mounting scheme, and voltage class align with FH17020B requirements.
• Keep a few FH17020B units on hand to minimize downtime during preventive maintenance and outages.

Choosing the right breaker means matching both the electrical load and the panel compatibility. The FH17020B delivers precise protection for single-phase 277V circuits with a trusted Square D pedigree, helping facilities maintain safe, continuous operation. If you’re planning a panel refresh, upgrade, or routine replacement, this 20A, 1-pole model is a straightforward, dependable choice.