Siemens 5SL6125-6 Miniature Circuit Breaker 1P 25A B 6kA

The Siemens 5SL6125-6 (MLFB: 5SL6125-6) is a SENTRON 1-pole miniature circuit breaker rated at 25 A with B-curve tripping characteristic and a breaking capacity of 6 kA. Designed for AC and DC circuit protection, it suits residential buildings and infrastructure installations on standard DIN rail.

Technical specifications:

• MLFB: 5SL6125-6
• Manufacturer: Siemens
• Product line: SENTRON
• Product type: Miniature circuit breaker
• Number of poles: 1P
• Tripping characteristic: B
• Rated current at 30 °C: 25 A
• Rated current at 40 °C: 23.48 A
• Rated current at 55 °C: 21 A
• Supply voltage (AC): 400 V, 50/60 Hz
• Operating voltage (multi-phase AC, max): 440 V
• Operating voltage (DC, max per pole): 62.5 V
• Insulation voltage (single-phase AC): 250 V
• Insulation voltage (multi-phase AC): 440 V
• Breaking capacity (EN 60898 / IEC 60947-2): 6 kA
• Energy limitation class: 3
• Power loss at rated current: 2.8 W per pole
• IP rating: IP20 (with connected conductors)
• Overvoltage category: 3
• Degree of pollution: 2
• Conductor cross-section (solid, stranded, finely stranded): 0.75 - 25 mm²
• Tightening torque: 2.5 - 3 N·m
• Dimensions (W x H x D): 18 x 90 x 76 mm
• Installation depth: 70 mm
• Modular width: 1 unit
• Net weight: 130 g
• Operating temperature: -25 °C to +45 °C
• Storage temperature: -40 °C to +75 °C
• Mechanical service life: 10,000 operating cycles (typical)

Features and benefits:

• Halogen-free and silicon-free construction
• Touch protection (IP20) for safe handling
• Sealable design to prevent unauthorised adjustment
• Mountable in any position on DIN rail
• Compatible with supplementary installable devices
• Suitable for both AC and DC circuits (no mixed use permitted)

Applications:

• Final circuit protection in residential buildings and infrastructure
• Overload and short-circuit protection in distribution boards
• DIN rail mounted installations in consumer units and switchgear
• DC circuit protection in battery-backed systems (up to 62.5 V DC per pole)

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

Also known as: Siemens 5SL6125-6, Siemens SENTRON MCB 1P 25A B-curve.