Siemens 5SL4108-6 1-Pole 8A B-Curve MCB 230/400V 6kA

Electrical circuits need reliable protection against overloads and short circuits to prevent damage to wiring and connected equipment. The Siemens 5SL4108-6 miniature circuit breaker (MCB) is engineered to deliver exactly that—swift, dependable interruption of fault currents in residential and commercial installations. With a rated current of 8 A and B tripping characteristic, it is ideal for protecting lighting and socket circuits where moderate inrush currents are expected.

Who is it for

This MCB is intended for electricians, panel builders, and maintenance professionals who require a compact, DIN-rail-mounted protection device that meets stringent safety standards. It suits both new installations and retrofits in distribution boards, consumer units, and control panels.

Main features

• 1-pole design, 8 A rated current, B tripping curve for standard circuit protection
• Rated voltage 230/400 V AC, 50/60 Hz, suitable for single-phase and three-phase systems
• Breaking capacity of 6 kA according to EN 60898-1, ensuring safe interruption of high fault currents
• Compact 1 module width (18 mm) saves space on DIN rail
• Screw terminals accept solid or stranded conductors from 0.75 to 25 mm²
• High mechanical endurance of 20,000 switching cycles and electrical endurance of 10,000 cycles
• IP20 protection at terminals (IP40 when installed in an enclosure)
• Operating temperature range from -25 °C to +45 °C for versatile environments

Specifications

• Brand: Siemens
• Model: 5SL4108-6
• MPN: 5SL4108-6
• EAN: 4001869439211
• Number of poles: 1P
• Rated current: 8 A
• Tripping characteristic: B
• Rated voltage: 230/400 V AC
• Rated switching capacity: 6 kA
• Frequency: 50/60 Hz
• Mounting type: DIN rail
• Module width: 1 TE (18 mm)
• Standard: EN 60898-1
• Degree of protection: IP20 (terminals), IP40 (with enclosure)
• Operating temperature: -25 °C to +45 °C
• Electrical endurance: 10,000 switching cycles
• Mechanical endurance: 20,000 switching cycles
• Connection type: screw terminals
• Terminal capacity solid: 0.75 - 25 mm²
• Terminal capacity stranded: 0.75 - 25 mm²
• Overvoltage category: III
• Pollution degree: 2

Tips

When installing, ensure the upstream overcurrent protection is coordinated with the MCB's breaking capacity. For optimal performance, use the specified torque when tightening screw terminals and verify that the ambient temperature does not exceed the rated range. This breaker is not suitable for DC applications; use only on AC circuits as specified.