Siemens CJD63B350 - 350 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Introducing the Siemens CJD63B350 from AmpState — a 350 A, 600 V, 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built to withstand demanding electrical environments, this unit pairs Siemens reliability with a robust mounting solution and precise protection performance.

Why this breaker stands out

• Secure bolt-on mounting: delivers a rigid, vibration-resistant bus connection that stays solid even in busy service panels and industrial environments.
• Thermal-magnetic trip unit: provides stable, repeatable protection by combining thermal elements that prevent nuisance trips with a fast magnetic trip during high faults.
• Three-pole configuration: balanced, coordinated protection for three-phase circuits—ideal for commercial and light industrial applications.
• High-capacity rating: 350 A continuous current and 600 V maximum voltage ensure reliable protection for mid-to-large branch circuits and motor feeders.
• OEM-panel compatibility: designed to integrate seamlessly with matching Siemens load centers and panelboards for coordinated protection and straightforward replacement.

Ideal use cases: Residential, commercial, and light industrial settings where robust overcurrent and short-circuit protection is essential. Use this bolt-on MCCB to safeguard three-phase feeders, motor circuits, and critical branch circuits in newer installations or panel upgrades.

Key specifications at a glance

• Manufacturer: Siemens
• Part number: CJD63B350
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage rating: 350 A
• Voltage rating: 600 V
• Poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why it matters for your electrical system: this breaker’s bolt-on design and vibration resistance help minimize connections loosening over time, while the thermal-magnetic trip ensures precise protection aligned with the circuit’s fault current and ambient conditions. When paired with compatible Siemens panels, it delivers predictable trip behavior, ease of maintenance, and a cohesive protection strategy across your electrical distribution setup.

Practical deployment tips

• Verify bus connections and cleat alignment before mounting to ensure optimal electrical contact and reliable performance.
• Choose a Siemens-compatible load center or panelboard to guarantee coordinated trip curves and interruption ratings across the distribution system.
• Assess continuous load versus fault current to confirm the 350 A rating is appropriate for the circuit being protected, helping minimize nuisance trips while maintaining safety.