Line protection for distribution panels
The Siemens SENTRON 3VM1220-3EE42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 200 A continuous current, with a TM220 thermal-magnetic release. It's designed for line protection in main or sub-distribution boards, delivering 76 kA interrupting capacity at 240 V AC and 53 kA at 415 V AC — enough headroom for high-fault utility feeds or transformer secondaries. The 200 A rating holds steady from 40 °C up to 50 °C ambient, then derates linearly to 176 A at 70 °C. That flat top from 40–50 °C is useful for panels in warm electrical rooms or near process heat — you don't lose capacity until the ambient pushes past 50 °C. The TM220 release is adjustable for Ir (continuous current setting) up to 200 A, with fixed magnetic trip thresholds. No communication module, no ground-fault monitoring — this is a straightforward thermal-magnetic MCCB for standard overcurrent protection.
Interrupting capacity across voltages
The 3VM1220-3EE42-0AA0's interrupting capacity drops from 76 kA at 240 V to 53 kA at 415 V, then 32 kA at 440 V, and 11.9 kA at 500 V. For a 480 V panel, the 32 kA at 440 V is the closest published figure — expect roughly that level. That's adequate for most commercial and light industrial services, but verify against your available fault current if you're close to the limit.
Panel fit and mounting
Dimensions are 140 mm wide, 158 mm high, and 70 mm deep — a standard 4-pole MCCB footprint for DIN-rail or screw-mount installation in distribution boards. The IP40 front protection means it's suitable for indoor panels where no water spray is present.