Siemens Miniature circuit breaker, 1-pole, 230/400V, 6kA, 20A Part number 5SY6120-7

Product Overview

Siemens SENTRON miniature circuit breaker (5SY6120-7) is a single-pole protective device designed to safeguard low-voltage electrical installations against overloads and short circuits. With a rated current of 20 A and a C-type magnetic-thermal trip characteristic, this breaker supports general power distribution and branch circuit protection in industrial, commercial and residential systems. Its compact modular body and DIN rail mounting system allow for easy installation and secure screw terminal connections.

Key Features

• SENTRON miniature circuit breaker
• Single-pole configuration for single-phase circuits
• Rated current of 20 A
• C-curve magnetic-thermal trip characteristic
• Provides overload and short-circuit protection
• Compact modular housing for DIN rail mounting
• Screw terminal connections for secure wiring
• Sealable and touch-protected enclosure

Technical Specifications

• Article Number: 5SY6120-7
• Product Family: SENTRON 5SY6 miniature circuit breakers
• Device Type: Miniature circuit breaker (MCB)
• Number of Poles: 1
• Rated Current (In): 20 A
• Tripping Characteristic: C-curve
• Rated Operational Voltage (AC): 230 / 400 V AC
• Rated DC Voltage: 72 V DC
• Rated Insulation Voltage (Ui): 440 V
• Rated Impulse Withstand Voltage (Uimp): 4 kV
• Breaking Capacity: 6 kA
• Energy Limitation Class: 3
• Operational Frequency: 50 / 60 Hz
• Connection Type: Screw terminals (top and bottom)
• Connectable Conductor Cross-Section: 0.75 … 35 mm²
• Terminal Tightening Torque: 2.5 … 3.5 N·m
• Protection Class: IP20 with connected conductors
• Degree of Pollution: 3
• Overvoltage Category: III
• Mounting: DIN rail mounting (any position)
• Dimensions (H × W × D): approx. 90 mm × 18 mm × 70 mm
• Modular Width Units: 1
• Weight (approx.): ~0.15 kg
• Operating Ambient Temperature: –25 °C to +55 °C
• Storage Temperature: –40 °C to +75 °C

Compliance & Certifications

• Manufactured to Siemens electrical protection standards
• Designed to IEC and EN circuit breaker specifications
• CE compliant
• RoHS compliant

Applications

The Siemens 5SY6120-7 SENTRON miniature circuit breaker is used to protect single-phase electrical circuits in industrial, commercial and residential distribution boards. It provides dependable overload and short-circuit protection for feeders, branch circuits and general power circuits, making it suitable for power distribution panels, machinery control boards and building installations.