Breaking capacity is 100 kA at 240 V AC and 400 V AC, dropping to 10 kA at 500 V AC and 2 kA at 690 V AC. At 400 V — the most common industrial distribution voltage — that 100 kA rating handles virtually any fault the upstream transformer can deliver, so it doesn't force a series rating or a larger upstream breaker.
Key features for the panel builder
Spring-loaded terminals accept 2x (0.25... 2.5 mm²) solid or 2x (0.25... 1.5 mm²) finely stranded with ferrule. AWG equivalents are 2x (24... 14). No screw tightening needed — strip, insert, release. The terminals are finger-safe (IP20 front protection), which matters for panel access without de-energizing the entire cabinet. No ground fault detection on this variant, so if that's required, you'd look at the GF version in the family.
RoHS compliant per the substance prohibition date of 01.01.2013. The surge voltage resistance is rated at 6,000 V, and it withstands 25g / 11 ms shock — both standard for industrial panel gear.
Sourcing this part
This is a current-production Siemens SIRIUS motor protection circuit breaker.