ABB S201U-K4A Circuit Breaker, 4A, 1-Pole

Meet the ABB S201U-K4A— a 1-pole, 4 A miniature circuit breaker built for industrial electrical service, maintenance, and replacement projects. As part of ABB’s S200U Miniature Breaker family, this device is designed to drop into compatible panels with precision and reliability, delivering dependable overcurrent protection for single-circuit applications.

• Manufacturer: ABB
• Series: Miniature Breaker S200U
• Part Number: S201U-K4A
• Product Type: Circuit Breaker
• Amperage: 4 A
• Poles: 1
• Notes: Verify fit by part number and application requirements

This 1-pole configuration is ideal for single-channel circuits where space is at a premium but protection is non-negotiable. Its compact footprint fits crowded panels and retrofit installations, making it a practical choice for upgrading legacy gear or scaling your control systems without overhauling electrical infrastructure.

• Leverages ABB’s proven reliability in industrial environments, helping reduce downtime and maintenance hassles.
• Direct compatibility with the S200U family simplifies replacement and commissioning in existing panels.
• Clear part-number verification minimizes misloads and ensures the correct device is protecting your circuit.
• Easy installation with standard miniature breaker mounting for quick field service.

Ideal use cases:

• Replacing a worn or tripped breaker in an industrial control panel
• Providing single-pole protection for low-current control circuits, lighting lines, or auxiliary equipment in machinery
• Incorporating into new equipment or control panels that require a 4 A, 1-pole protective device

How to confirm compatibility

• Check that your panel accepts S200U-series miniature breakers and supports a 1-pole, 4 A device
• Validate the exact part number (S201U-K4A) against your bill of materials or equipment documentation
• When in doubt, reference the application requirements and match them to the S201U-K4A specifications

Need help matching a part number or confirming compatibility? Message us and we’ll assist with precise, no-nonsense guidance to keep your electrical system protected and compliant.