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New miniature circuit breaker for operation in buildings

Siemens has developed a new miniature circuit breaker (MCB) with a switching capacity of 10 kilo amperes (kA), which can be used especially in non-residential and industrial buildings.

The 5SL4 miniature circuit breaker safely shuts down circuits in buildings in case of overloads or short circuits and thus protects cables and devices from damage. The MCB with an integrated snap-on fixing system for mounting on the standard mounting rail can be integrated with minimum effort in existing electrical installations and combined with additional devices.

The new Siemens 5SL4 miniature circuit breakers are rated for 10-kA applications and can be flexibly expanded to offer additional functions.

The MCB is compatible with all Siemens accessory components, such as AFD units, auxiliary and residual current operated circuit breakers, undervoltage releases and fault signal contacts, and can thus be expanded by a wide range of functions. In addition to high operational and plant safety, the 5SL4 miniature circuit breakers offer protection and convenience during installation and servicing: The touch protection integrated in the terminals protects the installer from electrical shock when connecting the devices. The colored switch position indicator integrated in the handle always clearly indicates the current switching state. A handle locking device prevents unauthorized switching. Thanks to the consistent busbar concept, all the devices can be quickly and easily fitted in existing electrical installations. With the aid of the latching slide, they can be conveniently mounted on or removed from the standard mounting rail in the junction box. The rectangularly-designed terminals offer space for pin busbars, as well as additional conductors with a surface area of 0.75 to 25 mm².

The new Siemens devices in the 5SL4 series are available with the tripping characteristics B, C and D: The miniature circuit breakers with tripping characteristic B are designed for universal use in socket outlet circuits and lighting circuits. In lamp and motor circuits with higher starting currents, miniature circuit breakers with tripping characteristic C are generally used. For electrical circuits with strong pulse-generating equipment, such as transformers or solenoid valves, switches are used with tripping characteristic D.

For further information on miniature circuit breaker, please see

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The Siemens Infrastructure & Cities Sector (Munich, Germany) with approximately 90,000 employees, focuses on sustainable technologies for metropolitan areas and their infrastructures. Its offering includes products, systems and solutions for intelligent traffic management, rail-bound transportation, smart grids, energy efficient buildings, and safety and security. The Sector comprises the divisions Building Technologies, Low and Medium Voltage, Mobility and Logistics, Rail Systems and Smart Grid. For more information, visit

The Siemens Low and Medium Voltage Division (Erlangen, Germany) serves the entire product, system, and solutions business for reliable power distribution and supply at the low- and medium-voltage levels. The Division's portfolio includes switchgear and busbar trunking systems, power supply solutions, distribution boards, protection, switching, measuring and monitoring devices as well as energy storage systems for the integration of renewable energy into the grid. The systems are supplemented by communications-enabled software tools that can link power distribution systems to building or industry automation systems. Low and Medium Voltage ensures the efficient supply of power for power grids, infrastructure, buildings, and industry. Additional information is available at:

Reference Number: ICLMV20131001e


Ms. Heidi Fleißner
Low and Medium Voltage Division
Siemens AG
Tel: +49 (941) 790-2212
Mr. Heiko Jahr
Low and Medium Voltage Division
Siemens AG
Freyeslebenstr. 1
91058 Erlangen
Tel: +49 (9131) 7-29575

Heidi Fleißner | Siemens Infrastructure
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