Siemens | Q390H | Circuit Breaker | 90A | 3-Pole | 240V | 22kA | Plug-In

Siemens Q390H stands as a reliable, plug-in circuit protection solution for 240V three-phase systems. Designed for maintenance, retrofit, and replacement scenarios where exact specifications matter, this 3-pole breaker delivers consistent performance with a robust 90A rating and a 22kA interrupting capacity. The plug-in design simplifies swaps in compatible Siemens panels, helping you minimize downtime during critical service windows.

Key specifications

• Amperage: 90 A
• Poles: 3-Pole
• Voltage: 240V
• Interrupting capacity: 22kA
• Connection style: Plug-In

Why this Siemens Q390H stands out

• 90 A at 240V with a solid 22kA interrupting capability ensures dependable short-circuit protection in commercial or industrial panel boards.
• Plug-In convenience: Quick, tool-free replacement within compatible load centers reduces downtime and simplifies ongoing maintenance or upgrades.
• Compatibility-driven design: The Q390H is identified by its part number, making it the best reference when confirming fit and ratings for your panel or retrofit project.
• Targeted use cases: Ideal for service upgrades, panel retrofits, or spare parts planning where a precise Siemens 3-pole, 90A, 240V solution is required.

Use cases and scenarios

Whether you’re refreshing an aging electrical panel in a commercial facility, performing a controlled retrofit to accommodate new equipment, or stocking a reliable spare for routine maintenance, the Q390H delivers predictable protection without complicating installation. Its 3-pole configuration supports 3-phase distribution systems, keeping equipment safely isolated during faults while enabling smooth coordination with upstream protection devices.

Installation and compatibility tips

• Verify compatibility first: Use the part number as your primary reference to ensure the Q390H will drop into your Siemens-compatible load center or panel board.
• Before ordering: Confirm the panel’s rating and pole arrangement match the Q390H’s 3-pole, 90A, 240V specifications to avoid mismatches.
• Replacement approach: The plug-in design supports quick swap-outs—great for scheduled maintenance or unexpected outages where minimizing downtime matters.

Designed for professionals who value precise specifications, straightforward installation, and dependable protection, the Siemens Q390H 3-Pole 90A 240V Plug-In Circuit Breaker is a focused, practical choice for maintaining safe, efficient electrical systems.