Transformer-protection breaker with 100 kA SCCR
The 45 mm width takes one standard 1-module slot on the rail — no different from a motor-protective breaker footprint. Terminal screws are M3 for the main contacts, accepting 2× (0.5 to 1.5 mm²) solid or stranded, or 2× (0.75 to 2.5 mm²). That covers most control transformer primary wiring up to about 2.5 mm². Clearance: 50 mm upwards and downwards, 30 mm at the side, zero forwards and backwards — meaning it can sit flush against a back panel or enclosure wall as long as the side gaps are respected for arc venting.