ABB Logo

The ABB ST203M-K3 is a 3-pole 3A mini DIN circuit breaker designed for reliable overcurrent protection in low-current industrial and commercial applications.

Technical Specifications

  • Model: ST203M-K3
  • Series: ST200M
  • Product Type: Mini DIN Circuit Breaker
  • Current Rating: 3A
  • Voltage Rating: 400V AC
  • Poles: 3
  • Breaking Capacity: 10kA
  • Operating Temperature Range: -25°C to 55°C
  • Mounting: DIN rail

Key Features

  • Compact design for space-saving
  • High reliability for low-current protection
  • Easy to install on DIN rail
  • Robust construction for durability
  • Compatible with ABB systems

Compatible Accessories

  • ABB DIN Rail Panels
  • Auxiliary contacts
  • Shunt trips
  • Busbars

Industry Applications

  • Power distribution systems
  • Control panels
  • HVAC systems
  • Commercial buildings

Installation & Maintenance Notes

  • Ensure proper voltage rating (400V AC)
  • Mount securely on DIN rail
  • Verify load compatibility
  • Inspect trip mechanism regularly
  • Test functionality periodically


We ship this product worldwide! Delivery is normally stock.
Request a Quote now or call us at 1-800-755-2883 for expert assistance.

Get A Quote

Fill in the form below, or call us now at 1-800-755-2883

"*" indicates required fields

This field is for validation purposes and should be left unchanged.

Full Product Catalog

See our comprehensive product catalog!