Siemens SJ1 400A 3P 600V Circuit Breaker | AmpState

The Siemens SJ1 400A 3P 600V Circuit Breaker delivers rugged, reliable overcurrent protection for panelboards, load centers, and electrical distribution networks. This SJ1 model is a smart pick for maintenance teams, panel builders, and spare inventory when a direct part-number match matters for fast, accurate replacements.

Whether you’re upgrading an existing installation or stocking for future service, the SJ1 provides a clear, compatible solution that aligns with Siemens-based systems. AmpState makes it straightforward to source this exact part, with support available to confirm fit and compatibility as needed.

• Manufacturer: Siemens
• Part Number: SJ1
• Product Type: Circuit Breaker
• Amperage: 400 A
• Poles: 3
• Voltage: 600V

• Exact part-number matching simplifies procurement, minimizes configuration errors, and reduces downtime when swapping in a proven Siemens component.
• Panelboard and load center ready—designed for protection duties across common electrical distribution setups, helping keep circuits safe and serviceable.
• Reliable supplier availability—AmpState stocks this SJ1 model so you can quickly locate the right part when time matters.
• Compatibility support—if you’re unsure about fit, we offer assistance to confirm compatibility and ensure a seamless replacement.

• Ideal for: maintenance and service teams performing panel upgrades or replacements in industrial facilities.
• Perfect for: panel builders stocking spare inventory to support rapid installations and on-site repairs.
• Use case: retrofits or new builds requiring a 3-pole, 400 A protection device at 600 V within Siemens-based electrical distributions.

Practical tips for best results:

• Verify that your panelboard or load center specifies a 3-pole, 400 A, 600 V device to ensure correct fit and protection level.
• Check busbar configuration and mounting compatibility with the SJ1’s form factor to avoid installation delays.
• Keep a small stock of SJ1 spares in accessible locations to minimize downtime during outages or scheduled maintenance.

If you need help matching a part number or confirming compatibility, send us a message and we’ll help you confirm the fit for your Siemens-based system.