What this MCCB is and what it protects
The Siemens 3VA1032-2ED36-0JH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — meaning it guards cables and distribution buswork against overloads and short circuits, not motor or generator circuits. It is a 3-pole unit rated 32 A at 40 °C ambient, with a thermal-magnetic trip mechanism and a trip indicator that shows when it has opened on fault.
Breaking capacity — what the numbers mean for panel coordination
This MCCB delivers 52.5 kA breaking capacity at 240 V AC, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. The 52.5 kA figure at 240 V is high enough for most secondary distribution panels fed from a large transformer; the 32 kA at 415 V covers standard European low-voltage mains. At 690 V the 7.5 kA rating limits its use to systems with relatively low available fault current — check your point-of-installation SCCR before specifying.
Thermal derating — how ambient temperature affects the continuous current
Rated 32 A from 40 °C through 50 °C ambient, it derates to 31 A at 55 °C and 60 °C, and to 30 A at 65 °C and 70 °C. If the panel runs hot — say inside a non-air-conditioned enclosure in summer — plan for that 2 A drop. The insulation voltage rating is 800 V, and maximum power loss is 10.6 W.
Auxiliary and release options built in
Factory-fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration), and a shunt trip release (STL) for remote tripping. No undervoltage release, no ground-fault monitoring, no communication module. The basic switch assembly carries order code 3VA10322ED360AA0.
Physical fit and environmental limits
Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint for DIN-rail or panel-mount installation. Operating temperature range -25 °C to +70 °C; storage from -40 °C to +80 °C.