The Siemens 5SL5803-7 is a 2-pole miniature circuit breaker rated for 6 kA interrupting capacity at 110 V DC, with a C-trip curve and a 3 A current rating. It occupies a single module width (18 mm) on the DIN rail, so it fits into a standard distribution board or sub-panel without crowding adjacent ways.
Its 18 mm width (1 MW) means a 12-way enclosure can hold up to 12 of these breakers side by side. The packaging dimensions are 93 x 21 x 83 mm, so the unit ships in a compact box that fits standard bin storage. The 2-pole design switches both the positive and negative lines in a DC circuit, which is the expected configuration for a DC branch circuit per IEC 60947-2.
RoHS compliance is confirmed effective 28 February 2022. The part also carries a REACH Article 33 duty-to-inform declaration for lead (CAS 7439-92-1) at >0.1% w/w, which is typical for electrical contacts and solder joints in this class. No UL or CSA listing is stated in the available documentation, so verify local code acceptance for the installation jurisdiction.