Square D B125S 3 P 125 A 347V Circuit Breaker Enclosure

Meet the Square D B125S 3P 125A 347V Circuit Breaker Enclosure — a rugged, purpose-built box for reliable electrical distribution where it matters most.

Crafted by Square D, this enclosure provides a sturdy home for three-pole, 125 amp breakers operating at 347 volts. It's designed for busy environments—industrial facilities, commercial sites, and demanding residential setups—where dependable service intervals and straightforward maintenance are essential.

Key strengths:

• Three-pole configuration supports multi-phase protection with a compact footprint, enabling efficient space use in panels and switchgear assemblies.
• 125 A amperage rating pairs with 347 V to handle common distribution circuits in mid-sized facilities, making it suitable for panel upgrades and retrofit projects.
• Solid enclosure design protects components from exposure and provides organized wiring paths, simplifying diagnostics during service calls.
• Backed by Square D's component compatibility and service network, ensuring readily available parts and predictable performance over time.
• Ideal for electricians, panel builders, and MRO teams who need trusted components for routine service work, short-notice maintenance, or stocking spares.

Applications and use cases

Upgrade aging panels in industrial settings where reliability is critical, retrofit existing distribution systems to current protection standards, or replace failed enclosures during planned maintenance. This unit is a practical fit for service crews performing small projects or stocking a reserve for quick outages.

Specifications at a glance

• Amperage rating: 125 A
• Voltage rating: 347 V
• Configuration: Three-pole (3P)

When planning your installation, ensure the enclosure aligns with your breaker catalog and mounting footprint, and confirm conductor sizing and termination compatibility for a smooth, code-compliant integration. If you rely on consistent, uptime-focused protection, this Square D B125S enclosure delivers the solid foundation you need for safe, organized power distribution.