Siemens Miniature circuit breaker, 1-pole, 230/400V, 10kA, 20A

Product Overview

The Siemens 5SY4120-7 is a high-performance miniature circuit breaker designed for reliable electrical protection in medium-current single-phase applications. This compact 1-pole circuit breaker features a 20 A current rating with 230/400 V operational voltage and enhanced 10 kA breaking capacity, making it ideal for protecting medium-current single-phase electrical circuits, heating systems, motor controls, and general-purpose equipment from overloads and short circuits.

Key Features

• Enhanced 10 kA Breaking Capacity: Superior protection against fault currents with higher breaking capacity than standard breakers
• Single-Pole Configuration: Space-efficient solution for single-phase line protection in distribution panels
• C-Type Characteristic: Optimized for general applications with moderate inrush currents (5-10 times rated current)
• Medium Current Rating: 20 A rating perfect for general circuits, heating systems, and medium-power equipment
• Compact Design: Space-efficient construction suitable for standard DIN rail mounting (D=70 mm)
• German Engineering: Manufactured in Germany ensuring premium quality and reliability
• UL1077 Recognition: Certified as supplementary protector for enhanced circuit protection
• Tool-Free Installation: Double slide mechanism enables quick assembly and disassembly without tools

Technical Specifications

• Current Rating: 20 A
• Voltage Rating: 230/400 V AC
• Breaking Capacity: 10 kA
• Number of Poles: 1
• Trip Characteristic: C-type
• Net Weight: 0.153 kg
• Depth: 70 mm (D=70 mm)
• Width: 1 modular spacing (18 mm)
• Operating Temperature: -25°C to +55°C
• Packaging Dimensions: 21.00 x 93.00 x 83.00 mm
• Country of Origin: Germany
• EAN: 4001869181400

Applications

This medium-current 1-pole circuit breaker is particularly suitable for:

• General residential and commercial circuits
• Lighting panel main feeders
• Medium-power heating circuits
• Motor control applications
• Power distribution panels
• Workshop and garage circuits
• Electric water heater protection
• Air conditioning unit circuits
• Commercial appliance protection
• Industrial machinery feeders
• Pump and fan motor controls
• Ventilation system protection
• Heavy-duty outlet circuits
• Equipment panel protection
• General-purpose branch circuits

Compliance & Certifications

• Standards Compliance: UL1077 recognized, IEC 60898-1/-2, IEC 60947-2, GB10963.1/.2, GB14048.2
• CE Marking: Complies with global standards for European markets
• RoHS Compliance: Compliant since January 1, 2006
• WEEE Directive: Subject to take-back obligations under directive 2012/19/EU
• REACH Regulation: Contains lead in concentrations higher than 0.1% w/w - safe when used as intended
• Export Control: AL: N / ECCN: N
• Product Class: B - Return restricted, contact Siemens partner for returns

Advanced Features

• Single Pole Protection: Efficient line protection for single-phase applications
• Visual Status Indication: Window design with clear position indicators
• Touch Protection: Anti-finger contact terminal design for enhanced safety
• Dual-Chamber Terminals: Flexible conductor and busbar combinations
• Enhanced Safety: Insulated, dust-proof and anti-touch design
• Ergonomic Handle: Non-slip pattern handle for comfortable operation
• Modular Compatibility: Compatible with wide range of supplementary components
• Energy Limitation: Class 3 current limiting for enhanced protection
• High Breaking Performance: 35 kA breaking capacity according to IEC 60947-2
• Wide Temperature Range: Reliable operation from -25°C to +55°C for harsh environments

Product Classification

• eClass: 27-14-19-01 (versions 6-14)
• ETIM: EC000042 (versions 7-9)
• UNSPSC: 39-12-16-03
• IDEA: 4897
• Product Group: 5505

Download existing graphical data for this product:

• Product Datasheet
• Installation Manual
• SENTRON Product Catalog
• Technical Documentation