Siemens SENTRON 5SY51207 johdonsuojakatkaisija 1P C20 20 A 230/400 V 6 kA

The Siemens SENTRON 5SY51207 is a miniature circuit breaker (MCB) with 1 pole and C tripping characteristic, rated at 20 A for 230/400 V AC systems. It offers a breaking capacity of 6 kA and is designed for DIN rail mounting, providing reliable protection for circuits in residential and commercial installations.

Advantages

The C characteristic ensures tripping at 5-10 times rated current, making it suitable for circuits with moderate inrush currents such as lighting and socket outlets. Screw terminals accommodate conductors up to 35 mm², and the device operates reliably in ambient temperatures from -25°C to +55°C.

Suitable for

• Protection of lighting and socket circuits
• Residential and commercial distribution boards
• DIN rail mounting in enclosures

Key specifications

• Number of poles: 1P
• Tripping characteristic: C
• Rated current: 20 A
• Rated voltage: 230/400 V AC
• Breaking capacity: 6 kA
• Frequency: 50/60 Hz
• Mounting: DIN rail
• Connection: screw terminals
• Terminal capacity: 0.75–35 mm² solid, 0.75–25 mm² stranded
• Degree of protection: IP20 (terminals), IP40 (with cover)
• Ambient temperature: -25°C to +55°C
• Mechanical/electrical service life: 10,000 cycles
• Pollution degree: 3
• Overvoltage category: III
• Energy limiting class: 3

Recommendations

For circuits with higher inrush currents, consider a D characteristic MCB. Always ensure installation by a qualified electrician and compliance with local regulations.