Siemens Miniature circuit breaker, C, 1+N-pole, 230V, 10kA, 3A Part number 5SY4503-7

Product Overview

The Siemens 5SY4503-7 is a SENTRON 5SY4 miniature circuit breaker (MCB) with 1+N-pole configuration, providing reliable over-current and short-circuit protection for small circuits in residential, commercial or light-industrial installations. Its compact 2-module DIN-rail design and screw-terminal connections make it suitable for distribution boards, control panels and general purpose circuit protection.

Key Features

• 1 + N-pole miniature circuit breaker (1P + N)
• Rated current: 3 A
• Tripping characteristic: Class C — suitable for general circuits and light inductive loads
• Compact 2-module width for space-efficient DIN-rail installation
• Switchable neutral conductor (1 + N configuration)
• Combined top and bottom terminals (flexible wiring for live and neutral conductors)
• Touch-protected, halogen-free, sealable and silicon-free design
• Standard screw-terminal connections for solid, stranded, or finely stranded conductors
• Breaking capacity up to 10 kA (according to EN 60898 / IEC 60947-2), high DC breaking capacity for versatility
• Quick-assembly mounting system for fast installation and removal

Technical Specifications

• Article Number: 5SY4503-7
• Product Family: SENTRON 5SY4 miniature circuit breakers
• Poles / Configuration: 1P + N (2-pole: phase + neutral)
• Rated Current (In): 3 A (AC, 230 V)
• Operating Voltage (AC): 230 V AC (single-phase), 50/60 Hz
• Rated Insulation Voltage (Ui): 250 V AC (single-phase) / 440 V AC (multi-phase) as per 5SY4 series standards
• Rated Breaking Capacity (Icn / Icu): 10 kA (EN 60898 standard) / higher under IEC 60947-2
• DC Breaking Capacity (according to IEC 60947-2): 15 kA
• Modular Width: 2 modules
• Dimensions (approx. H × W × D): 90 mm × 36 mm × 76 mm
• Mounting Type: DIN-rail (35 mm) quick-assembly or panel mounting
• Connectable Conductor Cross-Section: 0.75 … 35 mm² (solid or stranded)
• Protection Class (with conductors connected): IP20
• Mechanical Service Life (typical): approx. 10,000 switching cycles
• Ambient Operating Temperature Range: –40 °C … +70 °C
• Overvoltage Category / Pollution Degree: Category III / Pollution Degree 3
• Neutral Conductor Switching: Yes (1+N configuration)
• Product Features: Touch protection; halogen-free; sealable; silicon-free

Compliance & Certifications

• Compliant with IEC / EN 60898-1 for miniature circuit breakers
• Also compliant with IEC / EN 60947-2 for industrial applications where higher breaking capacity is required
• Designed and manufactured according to Siemens SENTRON 5SY4 series standards for safety, durability and installation flexibility

Applications

The 5SY4503-7 is ideal for protective switching of small lighting circuits, socket-outlet circuits, control circuits or other general purpose low-current circuits in residential buildings, commercial installations or light industrial environments. Its 1+N-pole design with switchable neutral, compact DIN-rail format, and combined terminal connections make it particularly suitable for modern distribution boards, retrofit installations or modular panel wiring schemes where efficient space usage and reliable over-current protection are needed.