Square D QH3301021 30A 3-Pole 240 V Circuit Breaker Potential Transformer

Introducing the Square D QH3301021 30A 3-Pole 240 V Circuit Breaker — a robust protection device engineered for dependable 3-phase power distribution. With a 30 A rating and 240 V operating range, this breaker guards motors, HVAC units, and other heavy equipment from overloads and short circuits while keeping energy flows steady and safe. The “Potential Transformer” designation signals easy integration with voltage sensing and metering systems, simplifying monitoring and energy management in modern facilities.

Key specifications

• Current rating: 30 A
• Poles: 3
• Voltage rating: 240 V
• Part number: QH3301021
• Type: 3-pole circuit breaker for three-phase circuits

What sets this apart

The QH3301021 leverages a three-pole design to simultaneously protect all phases, reducing the risk of dangerous phase imbalances that can occur with single- or two-pole solutions. Built for reliability in demanding environments, it supports consistent tripping behavior across all three conductors, helping to safeguard wiring, motors, and control circuits.

Ideal use cases

• Three-phase motor control circuits in manufacturing and processing facilities
• Power distribution in commercial buildings and data centers
• HVAC equipment and large lighting systems wired for 3-phase supply
• Panel upgrades or replacements requiring the QH3301021 form factor

Installation and integration tips

• Verify panel compatibility with Square D QH-series breakers to ensure proper fit and bus alignment.
• Ensure supply is within 240 V and load current does not exceed 30 A for safe operation.
• If integrating with potential-transformer-based monitoring, plan your metering and protection scheme to leverage this unit’s compatibility.
• Have a licensed electrician perform installation to comply with local electrical codes and safety standards.

Why choose Square D for your protection needs

Square D has a long-standing reputation for durable, reliable distribution protection. The QH3301021 brings that reliability into 3-pole, 240 V circuits, delivering consistent protection for critical loads and simplifying maintenance with a standardized, field-proven design. It’s a precise, purpose-built solution when you need dependable 3-phase circuit protection in challenging environments.