It is designed specifically for protecting three-phase induction motors in control panels. The key ratings that decide fit: Trip Class 10 (trips within 10 seconds at 7.2× current setting, standard for standard-duty motor starts), 100 kA SCCR at both 240 V and 400 V (meaning it can safely interrupt a fault current up to 100 kA without upstream fuses blowing — critical for high-fault panels), and built-in phase failure detection (opens the circuit if one phase drops, preventing single-phasing damage).
The 45 mm width and 75 mm depth fit standard 45 mm-per-pole spacing on a DIN rail. Required clearances for heat dissipation and arc venting: 20 mm upward, 20 mm downward, 9 mm to the side. Zero clearance needed forward or backward — so it can sit flush against a panel backplate. Mounting position is any, which helps in tight retrofit cabinets.
Fuse Backup Requirements
When used on systems with higher prospective fault current than the breaker's own interrupting rating, the manufacturer specifies upstream fuse backup. At 240 V no fuse is required. At 400 V use a gL/gG 40 A. The interrupting capacity itself is 100 kA at 240 V and 400 V, dropping to 3 kA at 500 V and 2 kA at 690 V.