ABB S202U-K0.5 0.5A 2-Pole 240 V Circuit Breaker Potential Transformer

Meet the ABB S202U-K0.5 0.5A 2-Pole 240 V Circuit Breaker Potential Transformer—a compact, dependable protection device engineered for precise control in modern electrical panels. Built by ABB, this part (S202U-K0.5) delivers a 0.5 A current rating across two poles at up to 240 V, making it an ideal choice for safeguarding low-current circuits and instrumentation in both industrial and commercial environments.

• Part Number: S202U-K0.5
• Current Rating: 0.5 A
• Poles: 2
• Voltage Rating: 240 V
• Application: Circuit breaker designed for use with systems that involve potential transformers and measurement circuits

Designed for reliability in demanding environments

With ABB’s engineering heritage, the S202U-K0.5 delivers consistent protection in control panels, switchboards, and industrial installations. The two-pole configuration ensures simultaneous isolation for both conductors, promoting safer maintenance and clearer fault indication in integrated electrical systems.

Practical use cases

• Protection of low-current instrumentation and control loops in manufacturing lines
• Protection of sensing circuits within building automation and energy-management setups
• Retrofits in legacy panels that require ABB-grade protection with a compact footprint

Why this breaker stands out

This ABB S202U-K0.5 pairs a precise 0.5 A rating with rugged construction and ABB’s signature reliability. Its 240 V rating covers a broad range of standard electrical systems, while the 2-pole design provides straightforward, predictable protection for both legs of the circuit—reducing the risk of latent faults in critical instrumentation paths.

Tips for installation and optimal performance

Ensure compatibility with your panel and follow applicable electrical codes during installation. Verify busbar configuration and mounting style for the S202U family, and keep a spare on hand to minimize downtime during maintenance or replacements. When paired with measurement-focused setups that use potential transformers, this breaker offers dependable protection without compromising monitoring accuracy.