Siemens Miniature circuit breaker, C-curve, 2-pole, 400V, 10kA, 20A Part number 5SL4220-7

Product Overview

The Siemens 5SL4220-7 is a 2-pole miniature circuit breaker (MCB) from the SENTRON / 5SL4 series. It provides reliable overload and short-circuit protection for low-voltage AC circuits — for residential, commercial or light-industrial installations. Its modest size, DIN-rail mounting, and broad compatibility make it suitable for general distribution boards and control panels.

Key Features

• 2-pole MCB, rated for 20 A nominal current
• Tripping characteristic: Type C — suited for general-purpose circuits with moderate inrush currents (e.g. lighting, socket circuits, small motors)
• Breaking capacity up to 10 kA — safe interruption of short-circuits
• Rated for 400 V AC (up to 440 V AC insulation), 50/60 Hz supply — suitable for standard three-phase or single-phase networks
• Halogen-free, touch-protected housing; IP20 protection (with connected conductors) — safe for cabinet use
• Sealable design — can be used as a main switch / lockable protection device
• Compatible with additional accessories (auxiliary contacts, fault-signal contacts, shunt trips, under-voltage releases) for extended functionality
• Compact DIN-rail mounting — easy to integrate in distribution boards or control cabinets

Technical Specifications

• Article Number: 5SL4220-7
• Product Series: SENTRON 5SL4 miniature circuit breakers
• Number of Poles: 2 (2P)
• Rated Current (In): 20 A
• Tripping Curve: C (Type C)
• Rated AC Voltage: 400 V AC
• Insulation Voltage (Ui): up to 440 V AC
• Rated short-circuit breaking capacity (Icn / Icu): 10 kA (per EN 60898 / IEC 60947-2)
• Energy Limitation Class: 3
• Protection Class: IP20 (with conductors connected)
• Connectable Conductor Cross-Section (solid / stranded): 0.75 – 25 mm²
• Mechanical Service Life: Typically 10 000 switching cycles
• Mounting: DIN-rail (bus-bar or rail system), quick-release latch for tool-free replacement

Compliance & Standards

• Conforms to standard circuit-protection requirements for low-voltage AC systems (overload & short-circuit protection)
• Part of the 5SL4 SENTRON MCB family — designed for building, infrastructure, and light-industrial use
• Compatible with supplementary protection/enhancement modules (arc-fault detection, under-voltage releases, auxiliary contacts, etc.)

Applications

The 5SL4220-7 MCB is ideal for protecting branch circuits such as lighting, socket outlets, small appliance circuits, and small-motor loads in residential, commercial, or light-industrial buildings. It is also well suited for control-panel distribution boards, small machinery panels, and general low-voltage distribution systems where reliable overload and short-circuit protection is needed. Its compact 2-pole design and DIN-rail mounting make it easy to integrate into standard distribution boards or control cabinets.