Siemens B390 - 90A, 3-Pole, Circuit Breaker

The Siemens B390 - 90A, 3-Pole Circuit Breaker is built for dependable overcurrent protection in demanding electrical environments. With a 90-amp rating and a 3-pole configuration, this device provides true three-phase protection for panelboards, switchboards, and control panels, making it an ideal choice for industrial, commercial, and OEM applications.

Key benefits that matter in real-world installations

• 90A current rating – Robust protection for main feeders and branch circuits in medium-to-large distribution panels, helping prevent damage from overcurrents.
• 3-Pole design – Ensures synchronized interruption across all three phases, which is essential for safe operation of three-phase motors and equipment.
• Versatile installation – Suitable for panelboards, switchboards, and control panels, aligning with diverse electrical layouts used in industrial facilities.
• Siemens engineering – Seamless integration with Siemens electrical ecosystems, simplifying maintenance and replacement in existing installations.
• Reliable protection – Delivers consistent overcurrent protection to safeguard wiring, devices, and motor control centers from fault conditions.
• OEM-ready option – A practical choice for equipment manufacturers needing a trusted 3-pole breaker that can be incorporated into new builds or retrofits.

Ideal use cases

• Motor control centers (MCCs) and distribution panels where three-phase protection is critical for motor reliability.
• Industrial and commercial panel installations requiring a durable, high-current circuit-breaker compatible with existing Siemens gear.
• OEM equipment assemblies that demand a dependable 3-pole breaker to meet robust protection standards.

In practice, the Siemens B390 90A 3-Pole Circuit Breaker helps you maintain safe operation and electrical reliability in everyday workflows—whether you’re upgrading an aging panel, designing a new distribution solution, or equipping a motor-driven system in an industrial setting. When selecting protection for three-phase circuits, choose the B390 for a trusted Siemens solution that aligns with your panelboards, switchboards, and control panels.