The Siemens 3VA1220-5EF42-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated for 200 A continuous current in a 4-pole configuration, with a TM240 thermal-magnetic overcurrent release and a 187 kA interrupting capacity at 240 V. This is a line-protection version — meaning it is sized for feeder and main distribution duty, not motor-starting or generator applications where a different trip curve would be needed. The 200 A rating holds flat from 40 °C up to 50 °C, then derates to 176 A at 70 °C; that thermal stability matters when the breaker sits in a crowded panel where ambient climbs above the standard 40 °C reference point.
Breaking capacity across voltage levels
The interrupting rating drops with system voltage, as you would expect for an MCCB: 187 kA at 240 V, 121 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V. For a 415 V distribution board — common in European industrial plants — that 121 kA figure gives substantial headroom above typical transformer-fed fault levels (usually 25–50 kA), so selectivity with downstream breakers is achievable without oversizing the main. At 690 V the 17 kA rating still covers most motor-control-center faults, but verify your worst-case bolted-fault calculation if the transformer is close-coupled.
Auxiliary contacts and shunt trip
The breaker ships with a factory-fitted auxiliary contact block providing 2 auxiliary switches plus 1 trip-alarm switch (HQ designation), and a shunt trip release (STL) for remote opening. The shunt trip is ordered separately as 3VA9688-0BL33. If your control scheme needs undervoltage release or ground-fault monitoring, note that this variant carries neither — those would require a different order-code suffix. The front face is IP40 rated, so the breaker is suitable for enclosed panel mounting where the door provides the environmental seal.
Physical footprint
Dimensions are 158 mm height, 140 mm width, 70 mm depth. The 140 mm width is the standard 4-pole MCCB form factor for this SENTRON series, so it will fit the same mounting cutout and busbar spacing as other 4-pole 3VA breakers. Panel depth of at least 100 mm is advisable to allow clearance for the rear arc-chamber venting and wiring bends.