Siemens 3VA1220-5EF32-0KH0 — 200 A MCCB for Line Protection
The Siemens 3VA1220-5EF32-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated for 200 A at 40 °C, with a 3-pole configuration designed for line protection. Its interrupting capacity hits 187 kA at 240 V AC — that's the short-circuit rating that tells you it can clear a high-fault bolted fault without welding contacts or rupturing the case. The 800 V rated insulation voltage means it's comfortable in 480 V and 600 V class panels, not just 240 V distribution.
Current Ratings and Thermal Derating
Rated 200 A continuous from 40 °C up through 50 °C ambient (–). Above that, it derates: 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 hot — say, next to a drive cabinet — size the load to the 70 °C column, not the nameplate 200 A. Maximum power loss is 42 W, which matters for enclosure heat rise calculations.
Breaking Capacity by Voltage
The interrupting rating drops as system voltage climbs: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V (–). At 480 V (common in North American industrial panels) the 75.6 kA at 440 V is the closest published figure — expect it to be in that range. That's enough for most transformer-fed services, but verify against your available fault current.
Auxiliaries and Releases
Comes fitted with 2 auxiliary switches plus a trip alarm switch (HQ), and a shunt trip release (STL) (–). The shunt trip lets you remotely open the breaker from a PLC or emergency-stop circuit — no undervoltage release on this variant. The trip indicator and voltage trigger are present, so you get a local mechanical flag and a remote signal when it trips.
Physical Fit and Environment
Dimensions: 105 mm wide, 158 mm high, 70 mm deep. That's a standard 3-pole MCCB footprint — fits most SENTRON mounting bases and panel cutouts. Operating temperature range -25 °C to 70 °C (–); storage from -40 °C to 80 °C (–). No communication function, no ground-fault monitoring — this is a straight line-protection breaker with shunt trip.