ABB ST203MK25 - 25A, 3-Pole, Circuit Breaker

Introducing the ABB ST203MK25, a robust 25A, 3-Pole circuit breaker designed to protect three-phase electrical systems with clarity and reliability. Perfect for panelboards, switchboards, and control panels, this device delivers dependable overcurrent protection where it matters most—across industrial, commercial, and OEM applications.

Why this three-pole breaker stands out

The 3-Pole configuration provides comprehensive protection for all three phases, helping prevent motor stalls, wiring damage, and nuisance trips due to imbalanced loads. Built for environments where safe operation is non-negotiable, the ST203MK25 helps you maintain uptime in motor control centers and distribution panels.

• Current rating: 25A — precise protection for circuits sized up to 25 amps.
• Poles: 3-Pole — ideal for three-phase systems and balanced protection across all phases.
• Breaker type: Circuit Breaker — rapid response to overloads and short circuits to keep equipment safe.
• Applications: Panelboards, switchboards, control panels, motor control centers, and other distribution points in industrial, commercial, and OEM settings.

Practical benefits you can count on:

• Decreases equipment downtime by catching overloads before they cause damage.
• Streamlines installation and maintenance with a single device covering three phases.
• Supports consistent protection strategies in multi-panel distributions and motor circuits.

Best-use scenarios

• Protect three-phase motors and feeders in motor control centers and production lines.
• Safeguard power distribution in commercial three-phase systems where reliable trip protection is essential.
• Integrate into OEM panels to deliver standards-compliant overcurrent protection for three-phase equipment.

In short, the ABB ST203MK25 is a purpose-built, three-phase safety solution that pairs ABB’s reliability with straightforward integration into standard electrical assemblies. If your project requires a dedicated 25A, 3-pole circuit breaker for robust overcurrent protection, this device delivers clear advantages over multi-device setups and helps maintain safe, steady operation across your distribution network.