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5SY5120-7
Circuit breaker Universal current 220 V DC 230/400 V AC 10kA, 1-pole, C, 20A
- Stock status:
- Call for availability
- Manufacturer:
- Siemens
- Product code:
- 5SY5120-7
Main documents
- Product datasheet
- Instruction sheet
- Catalogue
Related products
| Product | |
| Article Number (Market Facing Number) | 5SY5120-7 |
| Product Description | Circuit breaker Universal current 220 V DC 230/400 V AC 10kA, 1-pole, C, 20A |
| Product family | Basic Devices |
| Product Lifecycle (PLM) | PM300:Active Product |
| Price data | |
| Region Specific PriceGroup / Headquarter Price Group | 12B / 1AC |
| List Price | Show prices |
| Customer Price | Show prices |
| Surcharge for Raw Materials | None |
| Metal Factor | L-O—– |
| Additional Product Information | ||
| EAN | 4001869226422 | |
| UPC | Not available | |
| Commodity Code | 85362010 | |
| LKZ_FDB/ CatalogID | LV10.1 | |
| Product Group | 5505 | |
| Group Code | P310 | |
| Country of origin | Germany | |
| Compliance with the substance restrictions according to RoHS directive | Since: 01.01.2006 | |
| Product class | B: return restricted, please contact your Siemens partner/contact | |
| WEEE (2012/19/EU) Take-Back Obligation | Yes | |
| REACH Art. 33 Duty to inform according to the current list of candidates | ||
| SCIP number | ec278d02-8ae9-40b2-b39c-962ac782b862 | |
Product Description
5SY5120-7
The Siemens 5SY5120-7 is a single-pole universal current miniature circuit breaker (MCB) designed to provide reliable protection for electrical circuits in both AC and DC applications. With a C-characteristic tripping curve and a breaking capacity of 10 kA, it is ideal for circuits with moderate inrush currents such as those found in lighting, mixed load, and small motor applications. The breaker supports universal operation at 220 V DC and 230/400 V AC, making it a versatile choice for modern distribution systems.
Key Features and Specification
- Rated Current (In): 20 A
- Rated Voltage (Un): 220 V DC / 230/400 V AC
- Breaking Capacity: 10 kA
- Poles: 1
- Tripping Curve: C Characteristic (designed for moderate inrush currents)
- Device Type: Universal Current Miniature Circuit Breaker (MCB)
- Installation: DIN rail mount (standard modular width)
Technical Information
- Number: 5SY5120-7
- EAN: 4001869226422
- Commodity Code: 85362010
- Catalog Reference: LV10.1
- Product Family: Basic Devices
- Product Group: 5505
- Group Code: P310
- Lifecycle Status: PM300 – Active Product
Applications
- Suitable for residential, commercial, and industrial distribution systems
- Ideal for circuits with moderate inductive loads, such as motors, transformers, and mixed appliances
- Provides reliable protection against short circuits and overload conditions
- Universal current design allows use in both DC and AC circuits
Summary:
The Siemens 5SY5120-7 MCB is engineered for dependable protection of electrical circuits across a wide range of applications. With its 20 A rated current, C-curve tripping, and 10 kA breaking capacity, it safeguards equipment and wiring from overload and short-circuit events. Its universal voltage compatibility (220 V DC / 230/400 V AC) makes it an excellent choice for flexible use in diverse power distribution setups, ensuring safety, reliability, and compliance with modern electrical standards.
Frequently Asked Questions
What is the rule for installing an SPD?
✅ SPD (Surge Protection Device) connections should be as short as possible to minimize the voltage protection level (Up). The total length of connections to the network and earth should not exceed 50 cm to ensure effective surge protection.
How to Set Up a Surge Protector?
1.Turn off power at the circuit breaker.
2. Remove the old outlet.
3. Connect wires to the new surge-protected outlet per the manufacturer’s instructions.
4. Secure the outlet in the box and replace the cover plate.
5. Restore power and test the outlet.
What is the use of RCCB in Siemens?
✅ Siemens Residual Current Circuit Breakers (RCCBs) protect against electric shock by detecting leakage currents. If the leakage exceeds a set limit, the RCCB immediately disconnects the circuit, ensuring safety from direct or indirect contact with live components.
Where is an RCBO used?
✅ RCBOs (Residual Current Circuit Breakers with Overcurrent protection) are commonly used in various residential, commercial, and industrial applications. Typical use cases include power distribution boards, emergency lighting circuits, HVAC (Heating, Ventilation, and Air Conditioning) systems, socket outlets, and swimming pool equipment. RCBOs are ideal for protecting individual circuits where both earth fault and overcurrent protection are required.
Where to Install RCCB?
✅ RCCBs should be installed in the distribution board (DB box) or circuit breaker panel to protect against current leakages caused by faulty wiring, ageing insulation, or defective appliances.
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