ABB ST202M-K20 20A 2-Pole 480 V Circuit Breaker Potential Transformer

The ABB ST202M-K20 is a compact, dependable circuit breaker designed to safeguard electrical distribution in demanding environments. With a 20 A current rating, a two-pole configuration, and a 480 V operating capacity, this device delivers reliable overcurrent protection for both lines in 3-phase systems while fitting neatly into ABB-compatible panels and gear.

Why choose the ABB ST202M-K20

• Accurate protection at 20 A to prevent nuisance trips and protect wiring and motors from overloads and short circuits.
• Two-pole design ensures simultaneous disconnection of both conductors in 480 V circuits, enhancing safety and simplifying automatic shutdown schemes.
• 480 V rating makes it suitable for industrial and commercial distribution where higher-voltage feeders are common.
• Trusted ABB engineering—part number ST202M-K20 aligns with ABB panels, bus systems, and protective schemes, supporting consistent performance across installations.
• PT-friendly protection workflows when used within protection schemes that rely on potential transformers for measurement and metering—maintaining compatibility with standard protection architectures.
• Ready for replacements and upgrades in existing ABB setups, ensuring a precise fit and predictable trip characteristics within established systems.

Ideal for

• Industrial control panels, switchgear, and motor control centers that require solid, meet-spec overcurrent protection.
• Electrical distribution in commercial facilities where 480 V systems are standard and reliable shutdown is essential.
• Panel refurbishments or upgrades where ABB-ST-series components are preferred for consistency and interchangeability.
• Systems using potential transformer-based metering or protection schemes that benefit from compatible breakers like the ST202M-K20.

Applications and use cases

• Feeder protection for 480 V circuits feeding pumps, fans, and HVAC equipment with quick, dependable isolation during faults.
• Main or sub-feed protection in distribution panels where a 2-pole device ensures coordinated shutdown of both hot conductors.
• Replacement in existing ABB installations to maintain electrical performance without reconfiguring panel layouts.
• New installations in facilities that standardize on ABB protection components for uniform maintenance and part availability.

Specifications at a glance

• Current rating: 20 A
• Poles: 2
• Voltage rating: 480 V
• Part number: ST202M-K20

For optimal results, confirm compatibility with your existing ABB panels and consult the product datasheet for exact installation dimensions and mounting requirements. The ABB ST202M-K20 offers a reliable, ABB-branded solution for protecting critical electrical infrastructure while supporting standard metering and protection schemes that use potential transformers.