The 10 A rating at 400/415 V translates to a motor power of 3 kW, with the same breaker covering up to 5.5 kW at 690 V — one SKU for a range of motor sizes, which simplifies BOM management. The magnetic trip is fixed at 149 A, so it clears a bolted fault on a 10 A motor circuit without nuisance tripping on start-up. Phase failure sensitivity is built in, per IEC 60947-4-1, which is a hard requirement for any motor protection device — it detects a lost phase and trips before the motor single-phases to failure.
This breaker carries a 100 kA Icu at 400/415 V AC per IEC 60947-2, which means it can safely interrupt a 100 kA prospective fault current at that voltage. For a 10 A motor circuit fed from a large transformer, that high interrupting rating lets you use it without an upstream fuse — the breaker clears the fault itself. At 690 V the Icu drops to 3 kA, so for 690 V applications the upstream protection needs to be coordinated. The utilisation category is Category A per IEC 60947-2, meaning it is not intended for frequent switching under load — that is the contactor's job. The breaker protects; the contactor switches.
Terminals accept up to two 6 mm² solid or 4 mm² flexible conductors per pole, with a tightening torque of 1.7 N·m.