Square D GJL36015M03 - 15 A, 3-Pole Circuit Breaker | AmpState

Why this 15A, 3-Pole MCCB stands out

• Space-efficient molded-case design: A compact footprint helps maximize panel interior space, making it easier to package multiple protective devices without crowding the bus or neighboring breakers.
• Thermal-magnetic trip unit: Combines thermal overcurrent sensing with magnetic instantaneous protection, delivering stable, repeatable protection performance across different temperatures and load conditions.
• OEM-ready compatibility: Specifically designed to pair with Square D panelboards and loadcenters, ensuring a straightforward replacement or upgrade path without compatibility issues.
• Versatile for a range of applications: Appropriate for residential, commercial, and light industrial circuits that require reliable 3-pole protection on 3-phase systems.

How it protects and why it matters

The 3-pole configuration ensures simultaneous disconnection of all three phases in a 3-phase system, which is crucial for preventing phase-to-phase faults and maintaining equipment safety. The 15A rating is ideal for branch circuits feeding control panels, small motor loads, lighting, and outlets in commercial spaces or light industrial environments. The thermal-magnetic mechanism provides a predictable trip curve, helping prevent nuisance trips while still delivering fast response to short-circuit conditions.

Technical snapshot

• Manufacturer: Square D
• Part Number: GJL36015M03
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 15A
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Install the Square D GJL36015M03 in panelboards and loadcenters where a compact, reliable 3-pole protection device is needed. It’s an excellent choice for:

• Replacements in existing Square D panelboards where OEM compatibility is essential.
• New installations in spaces with limited panel depth or width, where a compact MCCB helps maximize available space.
• 3-phase circuits in light commercial environments, providing balanced protection across all phases.

Practical deployment tips

• Verify that the panelboard or loadcenter is designed to accept the GJL36015M03 and that the 15A, 3-pole configuration matches the circuit requirements.
• When replacing a breaker, ensure the trip characteristics align with the protected load to minimize nuisance trips and maintain consistent protection.
• Follow the manufacturer’s torque specifications and installation guidelines to ensure secure bus connections and proper electrical contact.
• Keep track of the part number (GJL36015M03) for future replacements or spare parts to preserve system reliability.

What makes it a smart choice

Unlike generic protective devices, this Square D MCCB is built around an OEM-optimized platform that emphasizes seamless integration, predictable trip performance, and long-term reliability. Its molded-case construction provides robust mechanical integrity, while the thermal-magnetic trip unit delivers dependable protection across a range of operating conditions. For facilities relying on dependable electrical safety with straightforward replacement paths, this 15A, 3-pole breaker is a practical, purpose-built solution.