Current derating and thermal limits
The 32 A rating holds at 40 °C, 45 °C, and 50 °C ambient. Above that, the continuous current derates: 30.72 A at 55 °C, 30.08 A at 60 °C, 29.44 A at 65 °C, and 28.8 A at 70 °C. If the panel ambient runs hot — say, a crowded enclosure near a furnace line — factor the derating before committing the BOM. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Interrupting capacity across voltage levels
This MCCB delivers 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. The steep drop at 690 V means it is not the right choice for a 690 V distribution board unless the available fault current is well under 7.5 kA. For most 400 V-class industrial panels, the 52.5 kA figure gives ample headroom against typical transformer-fed fault levels.
Auxiliary contacts and integrated shunt trip
The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration). The auxiliary release is a shunt trip (STL) — a voltage-triggered coil that lets a remote signal (E-stop, PLC output, pressure switch) open the breaker. The integrated auxiliary trip order code is 3VA9688-0BL33. No undervoltage release, no ground-fault monitoring, no communication module, and no phase-failure detection are fitted. If you need any of those, this is not the variant.
Physical fit and panel integration
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. The 76.2 mm width is a standard 3-pole MCCB footprint — it occupies three 25.4 mm module spaces on a DIN rail or panel-mount base. Front IP40 protection means it is suited for dry indoor enclosures; not rated for washdown or outdoor exposure. The reference code per DIN EN 81346-2 is Q (switchgear).