Siemens Miniature circuit breaker, 3-pole, 400V 15kA, 6A Part number 5SY7306-8CC

Product Overview

The Siemens 5SY7306-8CC is a 3-pole SENTRON miniature circuit breaker designed for reliable protection of AC electrical circuits against overload and short-circuit faults. It features a D-curve trip characteristic suitable for high inrush loads and industrial applications requiring fast fault clearance and robust switching performance.

Key Features

• Miniature Circuit Breaker – SENTRON series
• 3-pole (3P) configuration
• D-Curve tripping characteristic
• Rated current: 6 A
• Rated supply voltage: 400 V AC
• High short-circuit breaking capacity: 30 kA (IEC 60947-2)
• Touch protection included
• Halogen-free, silicon-free & sealable
• Supports installation of supplementary devices

Technical Specifications

• Article Number: 5SY7306-8CC
• Design: 5SY7CC
• Poles: 3P
• Rated Current: 6 A
• Rated Voltage: 400 V AC
• Insulation Voltage: 440 V AC
• Tripping Class: D-curve
• Breaking Capacity: 30 kA (IEC 60947-2)
• Mechanical Life: ~20,000 switching cycles
• Power Loss (per pole): 1.5 W (max 4.5 W total)
• Protection Rating: IP20 (with connected conductors)
• Terminal Type: Combined top & bottom terminals
• Conductor Cross-Section: 0.75–35 mm² (solid/stranded), 0.75–25 mm² (fine stranded with ferrule)
• Tightening Torque: 2.5–3.0 Nm
• Dimensions (H × W × D): 90 × 54 × 76 mm
• Installation Depth: 70 mm
• Width Units: 3 modules
• Mounting: Quick assembly system
• Weight: approx. 495 g
• Ambient Temperature: –25°C to +55°C (storage –40°C to +75°C)
• Environmental Resistance: Vibration & shock tested per IEC 60068

Compliance & Standards

• IEC 60947-2 compliant
• DIN EN 61346-2 equipment marking: F
• CCC & CE approved

Applications

Suitable for industrial distribution boards, machinery circuits, motor/control loads with high inrush current, commercial infrastructure, and general AC network protection requiring high short-circuit capacity and D-curve performance. Ideal where reliability, endurance and fault handling strength are critical.