Square D KC321501021 Circuit Breaker, 150A, 3-Pole, 240V

Meet the Square D KC321501021 Circuit Breaker—a rugged, purpose-built solution for industrial electrical service, maintenance, and replacement projects. This 150A, 3-pole device is designed to protect 240V three-phase distribution, delivering reliable safety and dependable performance where it matters most.

Key specifications

• Amperage: 150 A
• Poles: 3-pole
• Voltage: 240V
• Brand: Square D
• Part number: KC321501021

Why a 3-pole, 240V breaker is essential in industrial settings:

• Provides synchronized protection across all three phases, ensuring a safe and complete shutdown during overloads or faults.
• Designed for use with Square D panels and compatible enclosures, making field replacements straightforward and reliable.
• Ideal for service entrances and equipment feeders powering three-phase machinery such as pumps, conveyors, motors, and industrial controls.
• Built to withstand demanding industrial environments while delivering consistent, predictable performance when the system is under load.
• Clear compatibility guidance: verify fit by part number and application requirements to avoid mismatches in critical installations.

How to verify compatibility and install with confidence:

Use the part number KC321501021 as your primary reference to confirm the exact fit for your panel or switchgear. Check your panel’s documentation for KC-series four- or three-pole 240V breakers and ensure the 150 A rating aligns with your circuit load calculations. If you’re uncertain about compatibility, you can reach out with the part number and panel details—we’ll help confirm fit and application requirements.

Practical use cases and scenarios:

• Replacing a failed breaker in an industrial control panel serving three-phase equipment like machining centers or process lines, where reliable disconnection on all phases is critical.
• New installations requiring a dedicated 3-pole 240V protective device to safely isolate all phases during maintenance.
• Maintenance planning for facilities that standardize on Square D KC-series components to streamline stocking, service response, and technician training.

What sets this model apart:

• Precise part-number focus: KC321501021 ensures you’re selecting the exact device designed for compatibility within Square D’s KC-series ecosystem.
• Three-pole configuration at 240V provides uniform protection across all phases, a cornerstone for safety in 3-phase systems.
• Robust construction tailored for industrial environments, enabling dependable protection and straightforward replacement in field conditions.

Pro tips for installation and ongoing reliability:

• Before installation, confirm the panel accepts KC-series breakers and that the 150 A rating matches the protected circuits’ load calculations.
• Maintain a small inventory of common KC-series part numbers to minimize downtime during maintenance windows.
• Document replacements with the part number KC321501021 and the panel model for accurate service records and audits.

Ready to confirm compatibility or place an order? Remember: verify fit by part number and application requirements. If you’d like assistance, send us a message with the part number and panel details, and we’ll help ensure you’re choosing the right device for your industrial electrical system.