Transformer-protection circuit breaker, 20 A, CLASS 10
Breaking capacity is substantial: 100 kA at 240 V AC, 50 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC. Ground fault detection is not included, so any ground-fault protection must be handled upstream.
The 45 mm width (3 module spaces) and 97 mm height fit standard panel layouts. Depth is 96 mm — check your enclosure depth if you are retrofitting into a shallow gland plate or a tight back panel. Main current circuit uses screw-type terminals accepting 2x (0.25... 2.5 mm²) solid or 2x (24... 14) AWG. Auxiliary and control circuits use spring-loaded terminals on the same wire range. The auxiliary switch is transverse design and is field-installable as a product extension — order it separately if you need remote status indication.
Auxiliary contact ratings and power dissipation
The auxiliary contact block (when fitted) is rated 1 A at 24 V, 0.5 A at 230 V, and 0.15 A at 60 V. These are the switching capacities for the control circuit — sufficient for PLC inputs or relay coils, but verify your load's inrush against the 1 A maximum at 24 VDC.
The part is RoHS compliant with a substance prohibition date of 01.05.2012, meaning it meets the EU RoHS directive effective from that date. The SIRIUS series typically carries UL, CSA, and CE certifications, though specific approvals for this exact order code should be verified against the nameplate. The manufacturer provides a declaration of conformity and a PDF manual; these are available through the standard Siemens documentation portal.