SIEMENS 5SY4350-6 3-Pole 50 A C-Curve Miniature Circuit Breaker 6 kA

Electricians and panel builders install the SIEMENS 5SY4350-6 in distribution boards to protect three-phase circuits from overload and short-circuit currents. This miniature circuit breaker (MCB) trips magnetically on high fault currents and thermally on sustained overloads, with a C-curve characteristic suited to general power distribution.

Key specifications

• Number of poles: 3
• Rated current: 50 A
• Tripping characteristic: C
• Rated switching capacity: 6 kA
• Rated voltage: 400 V AC
• Frequency: 50/60 Hz
• Mounting type: DIN rail
• Terminal type: screw terminals
• Degree of protection: IP20 (terminals), IP40 (with enclosure)
• Operating temperature: -25 to +45 °C
• Electrical endurance: 10000 switching cycles
• Mechanical endurance: 20000 switching cycles
• Rated insulation voltage: 440 V

Why choose it

The 5SY4350-6 combines a compact 3-module width with a 6 kA breaking capacity, making it suitable for residential and commercial sub-distribution. Screw terminals accept a wide range of conductor cross-sections, and the device mounts on standard 35 mm DIN rails.

Ideal use cases

• Protection of three-phase socket outlets and fixed equipment
• Feeder circuits in small industrial control panels
• Replacement for existing SIEMENS 5SY4 series breakers

Good to know

The breaker is designed for use in circuits up to 400 V AC and operates reliably across a wide temperature range. It is not suitable for DC applications.