The 187 kA interrupting capacity at 240 V is the headline number for panel SCCR compliance; at 415 V and 440 V it still holds 121 kA, and at 500 V it drops to 75.6 kA. At 690 V the rating falls to 3 kA, so this breaker is sized for 400–500 V distribution, not 690 V mains.
The depth is shallow enough to clear a 100 mm deep enclosure without a gland-plate conflict.
