SIEMENS 5SY62066 MCB 2-Pole 6A B-Curve 6kA DIN Rail Circuit Breaker

Protecting electrical circuits from overload and short-circuit damage is critical in residential and commercial installations. The SIEMENS 5SY62066 miniature circuit breaker (MCB) safeguards your wiring and connected equipment with reliable, fast tripping. This 2-pole, 6 A, B-curve breaker is engineered for DIN rail mounting, offering a compact 70 mm width that fits standard distribution boards. It interrupts fault currents up to 6 kA, ensuring safety and compliance with IEC 60898-1.

Who is it for

Electricians, panel builders, and maintenance technicians who need a dependable MCB for protecting lighting and socket circuits in homes, offices, and light industrial environments. It is ideal for new installations or as a replacement in existing Siemens distribution boards.

Main features

• 2-pole design for simultaneous disconnection of phase and neutral
• B-curve tripping characteristic: magnetic trip between 3 and 5 times rated current, suitable for resistive loads and long cable runs
• Rated current 6 A; rated voltage 230/400 V AC; frequency 50/60 Hz
• Short-circuit breaking capacity Icn = 6 kA according to IEC 60898-1
• Screw terminals accept solid conductors 0.75–35 mm² and stranded 0.75–25 mm²
• Degree of protection IP20 (terminals), IP40 when installed in an enclosure
• Mechanical and electrical service life of 10,000 switching cycles
• Operating temperature range -25 °C to +45 °C; pollution degree 3; overvoltage category III; energy limiting class 3

Specifications

• Brand: SIEMENS
• Model: 5SY62066
• MPN: 5SY6206-6
• EAN: 4001869246321
• Type: Miniature circuit breaker (MCB)
• Number of poles: 2
• Tripping characteristic: B
• Rated current: 6 A
• Rated voltage: 230/400 V AC
• Rated frequency: 50/60 Hz
• Breaking capacity: 6 kA
• Standard: IEC 60898-1
• Mounting: DIN rail
• Terminal type: Screw
• Terminal capacity solid: 0.75–35 mm²
• Terminal capacity stranded: 0.75–25 mm²
• Degree of protection: IP20 (terminals), IP40 (with enclosure)
• Mechanical service life: 10,000 cycles
• Electrical service life: 10,000 cycles
• Ambient temperature: -25 to +45 °C
• Pollution degree: 3
• Overvoltage category: III
• Energy limiting class: 3
• Type of voltage: AC

Tips

Ensure the breaker's rated current matches the circuit's load and that the cable cross-section is within the terminal capacity. For installations with high inrush currents (e.g., motors, transformers), consider a C or D curve instead. Always install in a suitable enclosure to achieve IP40 protection and comply with local electrical codes.