Siemens 5SY4120-7 Miniature Circuit Breaker 1P C20A 10kA SENTRON
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The Siemens 5SY4120-7 (MLFB: 5SY4120-7) is a 1-pole SENTRON miniature circuit breaker rated at 20 A with a tripping characteristic class C and a breaking capacity of 10 kA per EN 60898. Designed for both infrastructure and industry applications, it provides reliable overcurrent and short-circuit protection in AC and DC systems.
Technical specifications:
- MLFB: 5SY4120-7
- Manufacturer: Siemens
- Product line: SENTRON
- Number of poles: 1 (1P)
- Tripping characteristic: Class C
- Rated current: 20 A
- Rated voltage (AC): 230 V (single-phase), 400 V (multi-phase)
- Insulation voltage (Ui): 440 V AC
- DC operating voltage: max 72 V
- Breaking capacity: 10 kA (EN 60898), 20 kA (IEC 60947-2)
- Energy limitation class: 3
- IP rating: IP20 (with connected conductors)
- Overvoltage category: 3
- Degree of pollution: 3
- Conductor cross-section: 0.75-35 mm² (solid/stranded), 0.75-25 mm² (finely stranded)
- Tightening torque: 2.5-3.5 N·m
- Dimensions (WxHxD): 18 x 90 x 76 mm, installation depth 70 mm
- Weight: 153 g
- Operating temperature: -40 °C to +70 °C
- Mounting: DIN rail, any position
- Frequency: 50/60 Hz
- Standards: IEC/EN 60898-1, IEC/EN 60947-2, UL 1077
Features and benefits:
- Touch protection with combined top and bottom terminals for safe wiring
- Halogen-free, silicon-free, and sealable construction
- Suitable as main switch per EN 60204-1
- Supplementary devices can be installed for extended functionality
- Wide operating temperature range: -40 °C to +70 °C
- Mechanical service life of 10,000 operating cycles
Applications:
- Overcurrent and short-circuit protection in residential and commercial distribution boards
- Protection of final circuits in industrial control panels
- Use as a main switch in machinery per EN 60204-1
- Infrastructure and industry installations requiring 230/400 V AC protection
Compliant with IEC/EN 60898-1 and IEC/EN 60947-2. Part of the Siemens SENTRON range.
Also known as: Siemens 5SY4120-7, SENTRON MCB 1P C20A 10kA.
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