ABB S203-K4 Circuit Breaker, 4A, 3-Pole

ABB S203-K4 Circuit Breaker is designed for demanding industrial environments, delivering dependable protection for 3-phase electrical systems. This 4 A, 3-pole unit is a key component in the 3P Mini Circuit Breaker family of the S200 series, built to support service, maintenance, and replacement projects with precision and consistency.

Why choose the S203-K4 for your installation?

• Precise 4 A protection for small-to-moderate load circuits within a 3-phase system, helping prevent overheating and equipment damage without nuisance trips.
• Three-pole design provides synchronized protection across all three legs of a 3-phase panel, simplifying wiring and ensuring balanced fault isolation.
• Industrial-grade reliability engineered to withstand the rigors of routine maintenance and field replacements in commercial and manufacturing settings.
• Compact compatibility part of the S200 series, making it a straightforward fit into panels and enclosures designed for 3P Mini Circuit Breakers.

Use cases and practical scenarios

Ideal for service calls, equipment retrofits, or ongoing maintenance where a reliable 3-pole breaker with a modest 4 A rating is required. Use cases include small control circuits, lighting and motor circuits in compact 3-phase panels, and situations where quick, confident replacement is essential to minimize downtime.

Compatibility and installation notes

Key details to ensure proper fit and performance: verify the circuit breaker fits your application by the exact part number S203-K4 and confirm compatibility with your panel or enclosure that supports the 3P Mini Circuit Breaker S200 series. If you need assistance confirming compatibility, you can rely on our team to help verify fitment based on the part number and your specific requirements.

What makes this ABB breaker stand out

• Traceable part identity—use the S203-K4 to ensure you’re selecting the exact 3-pole, 4 A device designed for your 3-phase application.
• Streamlined replacement—designed to integrate with existing S200-series setups, reducing guessing during upgrades or repairs.
• Focus on reliability—built to deliver consistent interruption protection across the three conductors, helping protect value-driven industrial equipment and processes.

For professionals managing industrial electrical service, this ABB S203-K4 Circuit Breaker offers a precise, dependable solution for 3-phase protection with a 4 A rating. Its place in the S200 series ensures compatibility and straightforward replacement in compatible panels, supporting efficient maintenance workflows and long-term system protection.