ABB ST203M-K20 - 20A, 480VAC, 3-Pole, Circuit Breaker

Meet the ABB ST203M-K20 — a purpose-built 3-Pole circuit breaker engineered for reliable overcurrent protection in demanding 480V three-phase systems. With a 20A rating, it safeguards panelboards, switchboards, and control panels without compromising performance in industrial, commercial, and OEM environments.

Three-pole protection for balanced, dependable safety

• 3-Pole configuration delivers synchronized protection across all three phases, helping prevent phase-to-phase faults from impacting downstream equipment.
• 20A current rating aligns with common motor and drive loads in 3-phase systems, providing precise protection without nuisance tripping.
• 480VAC voltage rating ensures compatibility with standard industrial power distribution and control circuits.
• Designed for integration into panelboards, switchboards, and control panels, enabling clean, reliable protection in compact or modular layouts.
• Proven ABB reliability suitable for critical distribution panels and motor control centers in demanding environments.

Key specifications at a glance

• Current rating: 20A
• Voltage rating: 480VAC
• Poles: 3-Pole
• Breaker type: Circuit Breaker
• Applications: Overcurrent protection for distribution panels and motor control centers

Ideal for

• Industrial facilities with three-phase power distribution and motor control needs
• Commercial setups using 480V three-phase circuits requiring reliable protection
• OEM equipment where compact, dependable overcurrent protection is essential
• Control panels and switchboards that demand robust performance and straightforward installation

Practical considerations and use cases

Use the ST203M-K20 in three-phase distribution paths where a 20A protective threshold is appropriate for loads like motors, drives, and ancillary equipment. Its 480V rating makes it suitable for standard industrial power architectures, helping you maintain safe startup and operation of heavy equipment. In motor control centers or panel-centric layouts, this breaker provides clear electrical isolation and reliable fault interruption to minimize downtime and protect both personnel and equipment.

Why choose ABB for overcurrent protection

ABB’s ST203M-K20 combines a precise protective curve with rugged construction designed for harsh environments. By selecting a 3-Pole, 20A, 480VAC solution, you’re investing in a component that supports clean coordination with upstream power sources and downstream loads, reduces arc-flash risk in fault conditions, and helps maintain steady operation of critical machine tools, conveyors, and automation equipment.