SIRIUS 3RV2021-4DA10-0DA0 — System Protection Breaker, Size S0
The Siemens SIRIUS 3RV2021-4DA10-0DA0 is a circuit breaker designed for system protection in industrial control panels. It's a Size S0 frame breaker with Trip Class 10, meaning it trips within 10 seconds at 7.2x rated current — standard for motor branch-circuit protection where you need to let the starting inrush pass without nuisance tripping. Breaking capacity sits at 100 kA at 240 V AC, 55 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC. That 100 kA at 240 V is the headline number — it handles high-fault-current points-of-common-coupling without cascading upstream. Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715. Dimensions are 97 mm depth, 45 mm width, 97 mm height — the 45 mm width is a single module on a standard DIN rail, so it fits tight panel layouts without eating extra space.
DIN Rail Integration & Clearances
Clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm at the side, 0 mm forwards and backwards. That zero forward clearance means it can sit flush against the gland plate or back panel — useful when you're stacking breakers in a shallow enclosure. Terminals accept 2x (1 to 2.5 mm²) or 2x (2.5 to 10 mm²) solid or stranded. Main contact screws are M4. Screwdriver shaft diameter 5 to 6 mm. Any mounting position allowed.
Environmental & Backup Fuse Ratings
Operating temperature range -20 to +60 °C; storage and transport -50 to +80 °C. Backup fuse ratings: gG 63 A at 400 V, gG 50 A at 500 V and 690 V. No ground fault or phase failure detection on this variant — it's a straight thermal-magnetic system protection breaker.