Square D QJA221001 Circuit Breaker, 100A, 2-Pole

Square D QJA221001 Circuit Breaker, 100 A, 2-Pole is a rugged protection device engineered for demanding industrial electrical service, maintenance, and replacement projects. Use the part number to confirm compatibility for your application and keep critical systems protected with a reliable, fast-acting disconnect.

Trusted protection for industrial panels and distribution

Designed as a two-pole breaker, the QJA221001 delivers coordinated interruption for both conductors, helping prevent phase imbalance and ensuring a clean, simultaneous trip when fault conditions arise. This makes it a practical choice for industrial environments where uptime and safety are paramount.

Key specifications at a glance

• Brand: Square D
• Part number: QJA221001
• Product type: Circuit Breaker
• Amperage rating: 100 A
• Poles: 2
• Intended use: Industrial electrical service, maintenance, and replacement projects

How to verify compatibility

1. Match the part number QJA221001 to your panel or distribution equipment’s compatibility list.
2. Assess whether your application requires a 2-pole, 100 A protection device and ensure it fits within the panel’s design and bus configuration.
3. If you’re unsure about fit or substitutions, message us and we’ll help confirm compatibility based on your specific application requirements.

Use cases and practical scenarios

Ideal for:

• New industrial installations where reliable two-pole protection is essential for two energized conductors.
• Maintenance or retrofits on existing systems that require upgrading to a 100 A, two-pole solution with coordinated tripping.
• Replacement projects where QJA-series devices are specified to maintain system protection consistency and availability.

Why choose this model over alternatives

The QJA221001 pair with Square D’s proven design philosophy, delivering robust performance in demanding environments. By sticking to the exact part number, you ensure compatibility with your electrical architecture and preserve protective coordination across your protection scheme—reducing nuisance trips and simplifying future maintenance. This isn’t a generic component—it's a purpose-built solution for industrial service, maintenance, and replacement tasks where reliability matters most.

Tips for installation and ongoing care

For best results, ensure installation follows your local electrical codes and the panel manufacturer’s guidance. Verify that the breaker’s rating matches the circuit’s load demand and that conductors are properly terminated. Periodic inspection of connections and trip mechanisms helps maintain dependable performance over time. If you’re coordinating a replacement, keeping the same part number simplifies ordering and ensures consistent protection characteristics across your fleet of equipment.