ABB S201UP-K4 4A 1-Pole 277 V Circuit Breaker

ABB S201UP-K4 4A 1-Pole 277 V Circuit Breaker is a purpose-built overcurrent protection device designed for single‑phase 277 V electrical systems. With a precise 4 A current rating and a single pole, this breaker targets small-draw circuits while safeguarding against overloads and short circuits. Part number S201UP-K4 identifies the exact ABB family member, ensuring compatibility with compatible panels and replacement parts.

Key specifications at a glance

• Current rating: 4 A
• Poles: 1
• Voltage rating: 277 V
• Part number: S201UP-K4

Why this matters for your electrical setup

- Designed for 277 V single‑phase distribution, a common setup in commercial lighting, office buildings, and certain industrial environments. The 4 A rating is ideal for protecting small branch circuits or dedicated loads where a higher amp breaker would be excessive. - A single‑pole configuration simplifies installation on simple, uncomplicated circuits, helping to minimize panel space while delivering reliable protection. - Using a purpose-built ABB device helps maintain system coordination and labeling consistency across your electrical distribution.

Ideal use cases

• Protecting small lighting runs or dedicated control circuits operating at 277 V
• Branch circuits in commercial spaces where a lighter current protection is required
• Replacement in ABB panels or systems designed to accept the S201UP-K4 family breakers

How this compares to other options

- If your application requires single‑pole protection specifically for 277 V lines, the S201UP-K4 offers a precise 4 A rating that matches lightweight, low-load circuits without over-tripping broader, higher-capacity breakers. - For larger loads or multi‑phase distribution, a higher‑amp or multi‑pole solution would be more appropriate; this ABB device excels in targeted, low‑current protection scenarios where space and compatibility matter.

Practical installation and handling tips

• Ensure the circuit is de‑energized before replacement or installation.
• Verify that the panel or enclosure accepts the S201UP-K4’s single‑pole format and 277 V rating.
• Label the protected circuit clearly to reflect its 4 A rating and 277 V application for future maintenance.

Who should consider this breaker

- Electricians and facility managers working with commercial 277 V distribution who need precise, low‑amperage protection on small circuits. - Anyone replacing a worn or mismatched breaker in ABB‑compatible panels where a 4 A, 1‑pole device is the correct specification.

With the ABB S201UP-K4, you get a dedicated, purpose‑built solution for protecting lighter 277 V circuits. It’s the reliable choice when your design calls for a 4 A, single‑pole breaker that fits within ABB’s established line of distribution protection products.