Introduction

ABB SX203-B40 is a compact miniature circuit breaker designed for reliable overcurrent protection in 400 V electrical systems. Ideal for installers and electrical panels, it combines solid performance with a compact footprint for straightforward integration.

Key Features & Design

• Protection type: Miniature Circuit Breaker (MCB)
• Nominal current: 40 A
• Nominal voltage: 400 V
• Tripping curve: Type B
• Breaking capacity: 6,000 A
• Frequency range: 50/60 Hz
• Dimensions: Width 52.8 mm, Depth 69 mm, Height 85 mm

Performance / Benefits

This ABB SX203-B40 delivers dependable protection for circuits up to 40 A in 400 V systems, with a robust breaking capacity of 6 kA to safely interrupt faults. The Type B trip curve provides timely response to overcurrent conditions typical of residential and light commercial loads, helping prevent damage and downtime. Its compact dimensions simplify installation in standard distribution boards, making it a practical choice for space-conscious panels without compromising safety.