Square D QOB3125SL 125A 3P Circuit Breaker, Bolt-On | AmpState

Meet the Square D QOB3125SL—a 125A, 3-pole bolt-on circuit breaker designed for robust circuit protection in panelboards, load centers, and electrical distribution systems. This unit is the smart choice when a precise part-number match is essential for maintenance, panel fabrication, or spare inventory.

Key specifications

• Manufacturer: Square D
• Part Number: QOB3125SL
• Type: Circuit Breaker
• Amperage: 125 A
• Poles: 3
• Mounting: Bolt-On
• Availability: From AmpState

Why this bolt-on breaker stands out

• Direct part-number match matters for quick replacements and consistent panel assembly. If your project calls for QOB-series bolt-on protection, this is the exact device to spec.
• Secure bolt-on mounting provides dependable, vibration-resistant installation in compatible panelboards and distribution equipment.
• 3-pole, 125 A capacity supports three-phase circuits and higher load protections common in commercial and industrial setups.
• Rapid inventory usability—keep this exact model on hand to minimize downtime when replacements are needed, without guessing compatibility.

Ideal use cases

• Panelboard and load center retrofits where a bolt-on Square D breaker is required.
• Spare parts inventory for projects that rely on precise, direct-part-number compatibility.
• New builds or refurbishments in commercial and light industrial environments that employ Square D bolt-on protection schemes.

Installation and compatibility tips

• Verify your panels are designed for bolt-on breakers in the QOB family, ensuring a proper fit and secure mounting.
• Use in 3-phase distributions where a 125 A protection device is appropriate for the circuit load and wire sizing.
• Consult your panel labeling or project spec to confirm that QOB3125SL is the correct direct replacement or match for the intended circuit.

Need help confirming fit?

AmpState provides support to ensure you’re choosing the right part. Need help matching a part number or confirming compatibility? Send us a note and we’ll help you verify the fit.