Siemens 5SL6320-6 Miniature Circuit Breaker 3P 20A B 6kA 400V

The Siemens 5SL6320-6 (MLFB: 5SL6320-6) is a SENTRON 3-pole miniature circuit breaker rated 20 A at 400 V AC with a B tripping characteristic and 6 kA breaking capacity. It provides overcurrent and short-circuit protection for AC and DC circuits in residential and infrastructure installations.

Technical specifications:

• MLFB: 5SL6320-6
• Manufacturer: Siemens
• Product line: SENTRON
• Number of poles: 3 (3P)
• Tripping characteristic: B
• Rated current: 20 A at 30 °C / 18.79 A at 40 °C / 16.8 A at 55 °C
• Rated supply voltage: 400 V AC, 50/60 Hz
• Maximum operating voltage: 440 V AC (multi-phase) / 62.5 V DC per pole
• Breaking capacity: 6 kA (EN 60898 and IEC 60947-2)
• Energy limitation class: 3
• Insulation voltage (Ui): 440 V AC
• IP rating: IP20 with connected conductors
• Overvoltage category: 3
• Degree of pollution: 2
• Power loss per pole: 2.2 W at rated current
• Connectable conductor cross-section: 0.75 - 25 mm² (solid, stranded, finely stranded)
• Tightening torque: 2.5 - 3 Nm
• Dimensions (WxHxD): 54 x 90 x 76 mm
• Installation depth: 70 mm
• Modular width units: 3
• Mounting position: any
• Operating temperature: -25 °C to +45 °C
• Storage temperature: -40 °C to +75 °C
• Net weight: 390 g
• Mechanical service life: 10,000 operating cycles (typical)

Features and benefits:

• Touch protection (IP20) with connected conductors for safe handling
• Halogen-free and silicon-free construction
• Sealable design to prevent unauthorised adjustment
• Compatible with supplementary devices for expanded functionality
• Suitable for both AC and DC circuits (not mixed)
• Any mounting position supported, offering flexible installation

Applications:

• Final circuit protection in residential buildings and infrastructure installations
• Distribution board overcurrent protection on DIN rail systems
• 3-pole circuit protection where B-characteristic tripping suits resistive or lightly inductive loads
• Installations requiring energy limitation class 3 for downstream equipment protection

Compliant with EN 60898 and IEC 60947-2. Part of the Siemens SENTRON range.

Also known as: Siemens 5SL6320-6, SENTRON miniature circuit breaker 3P 20A B-curve.