Siemens CJD63B300 - 300 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens CJD63B300 is a 3-pole bolt-on molded case circuit breaker rated at 300A and 600V, designed to shield your electrical distribution system from overcurrent and short circuits. Built for reliability in panelboards and load centers, it delivers consistent protection where it matters most.

• Bolt-on mounting creates a secure, vibration-resistant connection to the bus bars, minimizing movement and loosening over time.
• Thermal-magnetic trip unit combines thermal (long-duration) and magnetic (short-circuit) protection for stable, repeatable response to fault currents.
• Three-pole design simultaneously protects three conductors, ideal for 3-phase or multi-wire branch circuits.
• 600V, 300A rating supports high-power loads while maintaining selective coordination with upstream devices.
• OEM panel compatibility designed to be used with matching Siemens OEM load centers and panelboards for seamless integration.

Ideal applications include residential upgrades, commercial electrical rooms, and light industrial panels where robust protection and reliable operation are critical. Whether you're upgrading an aging panel or completing a new installation, the CJD63B300 offers a proven combination of rugged construction and precise protection.

Practical use cases: - Replacing a failing circuit breaker in a 3-phase or multi-wire subpanel. - Upgrading service capacity in a commercial office or shop. - Installing in new construction where a secure, bolt-on MCCB is preferred for vibration-prone environments.

Technical snapshot: - Manufacturer: Siemens
- Part Number: CJD63B300
- Type: Thermal-magnetic molded case circuit breaker
- Amperage Rating: 300A
- Voltage Rating: 600V
- Number of Poles: 3
- Mounting Style: Bolt-on
- Application: Branch circuit overcurrent and short-circuit protection

Choose Siemens CJD63B300 for a dependable, long-lasting solution that aligns with Siemens' engineering standards and your panel's design. Ready to protect critical loads with precise, repeatable performance? Add to cart and secure your distribution protection today.