What this MCCB is and what it does
The Siemens SENTRON 3VA1220-5EF42-0AD0 is a 4-pole molded case circuit breaker (MCCB) rated 200 A at 40 °C, designed for line protection in distribution panels. Its interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V, and still holds 17 kA at 690 V — serious fault-clearing headroom for high-available-fault-current installations like industrial switchboards or transformer secondaries. The TM240 thermal-magnetic release means fixed thermal and magnetic trip settings; no electronic adjustment, no communication module, no ground-fault monitoring on this variant. Insulation voltage is rated 800 V, so it handles 480/277 V and 600 V systems comfortably.
Rated current and thermal derating
The 200 A rating holds flat from 40 °C through 50 °C, then derates to 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. If your panel ambient runs above 50 °C, size the load side for the derated figure, not the nameplate 200 A. Power loss at full load is 42 W maximum — manageable for a 4-pole frame this size, but factor it into enclosure thermal calculations if you're packing multiple breakers side by side.
Physical fit and panel integration
Footprint is 140 mm wide, 158 mm tall, 70 mm deep. That width is the standard 4-pole MCCB envelope for the 3VA1 frame — fits most DIN-rail-mount or panel-mount backplates without surprises. No undervoltage release, no voltage trip, no communication module on this order code, so wiring is limited to the line and load power connections plus the three auxiliary switch terminals (HQ type). If your BOM calls for shunt trip or UVR, this isn't the variant; you'd step to a 3VA1 with the appropriate suffix.