Siemens SENTRON 3VA1020-4ED36-0CA0 — 20 A MCCB with TM210 Release
The Siemens SENTRON 3VA1020-4ED36-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 20 A and fitted with a TM210 thermal-magnetic overcurrent release. Its interrupting capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that govern selectivity coordination in a distribution board. The rated insulation voltage Ui is 800 V, and the maximum power loss is 14.5 W. An undervoltage release is included; no trip indicator or communication function is fitted.
Interrupting Capacity and Thermal Derating
The 121 kA at 240 V is the headline SCCR for this frame — it safely interrupts fault currents up to that level without upstream cascading, per the IEC 60947-2 standard that governs MCCB performance. At 415 V the rating drops to 75.6 kA, at 440 V to 52.5 kA, and at 500 V and 690 V it holds at 11.9 kA. The continuous current rating is 20 A from 40 °C through 55 °C ambient; at 60 °C it derates to 19 A, and holds at 19 A through 70 °C. This thermal curve means the breaker can be applied in a warm enclosure without forced cooling, as long as the load stays at or below the derated figure.
Panel Integration and Physical Fit
The 3VA1020-4ED36-0CA0 measures 76.2 mm wide, 130 mm high, and 70 mm deep. It mounts on a DIN rail in a standard distribution panel or enclosure. The front face carries IP40 protection — suitable for dry indoor panels where tools are required to access live parts. The undervoltage release (fitted as standard) must be wired to the control voltage; verify polarity and coil rating against the panel's control transformer before commissioning.