Siemens SENTRON 3VA1120-5EF32-0AG0 — 20 A MCCB, Line Protection, Current Production
Its breaking capacity scales with system voltage: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V — figures that give ample headroom for most industrial distribution panels where fault currents are high but well-characterized. The TM240 thermal-magnetic overcurrent release is fixed-trip, so no field adjustment of the magnetic pickup; the thermal element holds full 20 A up to 50 °C ambient, then derates to 18 A at 70 °C.
Physical Fit & Panel Integration
At 415 V the rating drops to 121 kA, still well above what most secondary switchgear sees. The trip indicator is present, so after a fault you get a visual red flag on the front — no need to meter the load side to confirm it tripped.