Siemens Circuit breaker, 1-pole, D-curve, 3A, 10kA Part number 5SY4103-8

Product Overview

The Siemens SENTRON 5SY4103-8 is a single-pole (1 P) miniature circuit breaker rated at 3 A with a D-curve tripping characteristic. Designed for use at 230/400 V AC with a high breaking capacity of 10 kA, it features a compact depth of 70 mm and modular width ideal for distribution boards and control panels.

Key Features

• Rated Current: 3 A
• Poles: 1 (single-pole)
• Trip Curve: D-curve – suitable for loads with higher inrush currents
• Breaking Capacity: 10 kA at 230/400 V AC
• Operating Voltage: 230/400 V AC; up to 72 V DC
• Width: 18 mm (1 module) for space-saving installation
• Depth: 70 mm installation depth
• Terminals: Screw clamp for conductor sizes 0.75 … 35 mm²
• Protection Class: IP20 (with connected conductors)

Technical Specifications

• Product Series: SENTRON 5SY4 Miniature Circuit Breakers
• Article Number: 5SY4103-8
• Number of Poles: 1 (1 P)
• Rated Current (In): 3 A
• Tripping Characteristic: D-curve
• Rated Short-Circuit Breaking Capacity (Icn): 10 kA (EN 60898) | up to 35 kA (IEC 60947-2)
• Rated Insulation Voltage (Ui): 440 V AC
• Rated Operational Voltage (Ue): 230/400 V AC
• Rated DC Voltage: Max. 72 V
• Power Loss (Typical): 1.2 W per pole
• Connectable Conductor Cross-Section: Solid/stranded 0.75 … 35 mm²
• Operating Temperature Range: –40 °C to +70 °C
• Dimensions (W × H × D): 18 mm × ~90 mm × 70 mm
• Net Weight: Approx. 0.152 kg
• Country of Origin: Germany

Compliance & Certifications

• Standards: EN 60898-1 (domestic/commercial MCB), IEC 60947-2 (industrial breaker)
• CE Marking: Complies with EU Low-Voltage Directive
• RoHS Compliant: Conforms to restricted substance regulations
• WEEE Directive: Take-back obligations apply

Applications

Ideal for branch-circuit protection in residential, commercial and light-industrial distribution boards and control panels. Suitable for lighting circuits, socket-outlet circuits, and auxiliary loads where compact size and higher inrush tolerance are required.