Automatic Siemens 40B 5SL6140-6A is an automatic fuse device that provides high security and reliability in electrical systems. This product works with a nominal current of 40 ampasses and has a B Type feature, which makes it ideal for high startup currents. Equipped with 6 ka breaking power, which provides effective protection from high currents caused by short-circuitating and download. Thanks to a compact and easy-to-install design, various electrical dashes can be easily used. This device has extensive application area for both professional electricians and individual users and is effective and reliable for electrical equipment protection. Can be used in both internal and external applications.​