Siemens Miniature circuit breaker, C-curve, 1-pole, 230V, 10kA, 20A Part number 5SL4120-7

Product Overview

The Siemens 5SL4120-7 is the Siemens SENTRON 5SL4 miniature circuit breaker, 1-pole, 20 A, C-characteristic. It is designed for overload and short-circuit protection in single-phase or multi-phase AC electrical installations, providing reliable protection with compact dimensions — suitable for distribution boards, control panels, and general electrical installations.

Key Features

• Single-pole miniature circuit breaker (1P)
• Rated current: 20 A (at 30 °C) — derated slightly at higher ambient temperatures
• Tripping characteristic: C — suitable for general loads and circuits with moderate inrush
• Rated operational voltage: 230/400 V AC (max. 440 V AC for multi-phase)
• Breaking capacity: 10 kA (suitable for typical short-circuit protection) — energy-limiting class 3
• Screw-type terminals — accepts conductors from 0.75 mm² up to 25 mm²
• Compact modular width: 1 unit (≈ 18 mm) — saves space in DIN-rail enclosures
• Mounting: DIN-rail (35 mm) — supports quick assembly and installation in distribution boards or control panels
• Touch-protected terminals and halogen-free, silicone-free materials — suitable for safe wiring and environmental compliance
• Sealable handle option — allows lockout/tagout for maintenance or safety purposes

Technical Specifications

• Article Number: 5SL4120-7
• Poles: 1 (single-pole)
• Rated Current (In): 20 A at 30 °C
• Rated Operational Voltage (AC): 230/400 V AC (max. 440 V AC for multi-phase)
• Breaking Capacity (Icu / Ics): 10 kA
• Tripping Curve: C characteristic
• Conductor Cross-section Range: 0.75 … 25 mm²
• Terminal Tightening Torque: 2.5 … 3.0 N·m
• Modular Width: 1 unit (≈ 18 mm)
• Dimensions (approx.): Height 90 mm, Depth 76 mm
• Protection Rating: IP20 (with connected conductors)
• Ambient Operating Temperature: –25 °C … +55 °C (typical for indoor installations)
• Mechanical Service Life: ~10,000 switching cycles under rated load
• Material Properties: Halogen-free, silicone-free, touch-protected terminals
• Optional Accessories: Auxiliary contacts, fault-signal contacts, shunt trips, undervoltage releases — for enhanced functionality

Compliance & Certifications

• Compliant with relevant low-voltage circuit-breaker standards (EN / IEC series for miniature circuit breakers)
• Designed within the SENTRON 5SL4 product line — compatible with standard bus-mounting and accessory systems
• Suitable for residential, commercial, and light-industrial electrical installations

Applications

The 5SL4120-7 is ideal for branch-circuit protection in distribution boards, control panels, and electrical installations supplying lighting, socket outlets, small motors, or general loads. Its 20 A rating and C-characteristic make it suitable for circuits with moderate inrush currents — such as small motor loads, lighting circuits with compact fluorescent or LED fixtures, or mixed general-purpose loads. The compact design and DIN-rail mounting make it flexible for use in new installations or retrofits where space is limited.