Square D | MJL36300 | Circuit Breaker | 300A | 3-Pole

Square D MJL36300 300A 3-Pole Circuit Breaker is a precise, OEM replacement designed for maintenance, retrofit, and replacement projects where exact specs matter. This unit fits into compatible Square D panels that support the MJL series, ensuring you stay aligned with your system’s protection plan.

• Amperage: 300 A
• Poles: 3-Pole
• Part reference: MJL36300 — the best compatibility reference for your panel

The MJL36300 is built for reliable three‑phase protection in industrial and commercial environments. By matching the MJL series specifications, it delivers consistent electrical performance within compatible Square D panels, helping you maintain system safety and continuity without unnecessary modifications or retrofits.

Ideal use cases:

• Maintenance and proactive replacement in existing Square D panels that specify MJL family breakers
• Retrofit projects where exact spec alignment is required to preserve protection schemes
• Three-phase electrical installations in manufacturing plants, data centers, and large commercial facilities

Why choose this part:

• Provides an exact, on‑spec replacement to minimize downtime and compatibility risk
• Supports a three‑pole configuration for balanced protection across all phases
• Part-number guidance (MJL36300) helps ensure you’re selecting the correct unit for your panel and bus configuration

Important compatibility note: Confirm fit and ratings before ordering. The MJL36300 part number is the best reference for compatibility with your panel model and bus configuration.

Practical tips for ensuring a smooth replacement:

• Check your panel’s catalog and verify that the MJL family is listed as compatible
• Inspect mounting locations and bus stab connections for signs of wear before installation
• Adhere to all safety practices and torque specifications during installation to maintain proper clamping and electrical contact