Siemens SENTRON 5SY6 MCB 3-Pole C20A 6kA 5SY63207

Miniature Circuit Breaker (MCB) from the Siemens SENTRON 5SY6 series, designed for reliable overcurrent protection in three-phase circuits. With a C-curve tripping characteristic and a rated current of 20 A, it delivers a short-circuit breaking capacity of 6 kA, making it suitable for commercial and industrial applications where moderate inrush currents are expected.

Advantages

Compact 3-pole design saves space on the DIN rail while providing full protection for all three phases. The C-curve characteristic ensures dependable tripping on overloads and short circuits without nuisance tripping from normal equipment start-up surges. High mechanical and electrical endurance (10,000 switching cycles) ensures long service life.

Suitable for

• Protection of three-phase motors, transformers, and distribution circuits
• Commercial and industrial installations with moderate inrush currents
• DIN rail mounting in distribution boards and control panels

Key specifications

• Number of poles: 3
• Rated current (In): 20 A
• Tripping characteristic: C
• Rated short-circuit breaking capacity (Icn): 6 kA
• Rated voltage (Ue): 230/400 V AC
• Frequency: 50/60 Hz
• Mounting: DIN rail (EN 60715)
• Terminal capacity: 0.75–35 mm² (solid), 0.75–25 mm² (stranded)

Recommendations

For optimal performance, ensure proper sizing of upstream protection and verify that the short-circuit current at the installation point does not exceed 6 kA. Install in a suitable enclosure to maintain IP20 terminal protection.