Instantaneous design — no adjustable delay — so it clears ground faults as fast as the fault current drives it, which matters for personnel protection in circuits where selectivity isn't the primary concern. Type A detection covers sinusoidal AC and pulsating DC residual currents, the standard for most mixed-load panels with electronics, drives, or rectifiers.
Rated 40 A at AC, but the thermal derating curve is worth noting for a warm panel: at 40 °C it's 37.2 A, at 50 °C it's 36 A, and at 70 °C it drops to 32 A.
Occupies 3 modular width units on DIN rail (124 mm wide, 90 mm tall, 77 mm deep, 70 mm installation depth). Mounts in any position; supply can land top or bottom. Not sealable, so no padlock hasp for lockout/tagout on the device itself.
Designed for 50 Hz systems. Rated fault current is fixed at 300 mA — not adjustable. Surge current resistance 1 kA, surge voltage resistance 4 000 V. False tripping protection function is present. The product variation is listed as for 5SY, meaning it pairs mechanically and electrically with Siemens 5SY MCBs for a combined RCBO assembly in the same footprint.