ABB S202-K1 1A 2-Pole 277 V Circuit Breaker Potential Transformer

Introducing the ABB S202-K1 1 A 2-Pole 277 V Circuit Breaker — a compact, dependable protection solution built for commercial and light-industrial electrical systems. With a 2-pole configuration and a precise 1 A current rating, this ABB breaker delivers reliable, targeted protection for low-load circuits while thriving in 277 V distribution environments. The S202-K1 is designed to work seamlessly with protection and metering setups that rely on potential transformers, making it a smart choice for modern panels and control gear.

Key specifications and standout features

• Part Number: S202-K1
• Current rating: 1 A
• Poles: 2
• Voltage rating: 277 V
• Potential transformer compatibility: designed to integrate with monitoring and protection schemes that use potential transformers for accurate fault detection and measurement

Why it matters for your installation

Choosing a two-pole breaker like the S202-K1 ensures both conductors in a circuit are disconnected simultaneously, providing safer de-energization for equipment such as lighting gear, control panels, and small motors in 277 V networks. The 1 A rating is ideal for protecting low-load feeders and communication or sensing circuits where precise interruption is more important than high current capacity. By aligning with potential transformer-based monitoring, this breaker supports reliable fault indication and accurate metering in modern electrical rooms.

Ideal use cases

• 277 V distribution panels in commercial buildings (lighting, HVAC control, signage, small machinery)
• Low-load feeders and sensing circuits that require clean, predictable tripping
• Panels and switchgear paired with protection relays or metering systems that utilize potential transformers

Practical installation tips

• Ensure the breaker is installed in a compatible enclosure and tightened to manufacturer torque specifications for secure terminations.
• Verify that your circuit’s load stays within the 1 A rating to avoid nuisance trips and ensure reliable protection.
• Pair with appropriate conductors rated for 277 V operation and maintain clear labeling in the panel for quick identification during maintenance.
• For systems that rely on potential transformer-based monitoring, confirm electrical characteristics align with your protection and metering scheme to maximize fault visibility.

In summary, the ABB S202-K1 1 A 2-Pole 277 V Circuit Breaker offers precise, dependable protection tailored for 277 V networks and low-load circuits, with thoughtful compatibility for potential transformer monitoring. It’s an intentionally designed choice for professionals who demand reliable isolation, straightforward installation, and peace of mind in commercial electrical layouts.