The Siemens 3VA1020-3ED36-0KA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a 20 A rating at 40 °C, holds that rating through 55 °C, then derates to 19 A at 60 °C and above — so in a warm enclosure you lose 1 A, not a full trip threshold. The TM210 thermal-magnetic overcurrent release handles the overload and short-circuit curve; the shunt trip (STL) auxiliary release lets a remote signal or undervoltage condition open the breaker independently of the overcurrent trip mechanism. Breaking capacity is 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. That 75.6 kA figure at 240 V is the headline — it clears a high-fault bolted short on a 240 V secondary without upstream fuses needing to coordinate. At 690 V the 7.5 kA limit is the binding constraint; if your system voltage sits there, verify the available fault current stays under that ceiling. Rated insulation voltage is 800 V, so the breaker is electrically rated for 690 V systems with margin. Three-pole construction, 70 mm deep, 76.2 mm wide, 130 mm tall — fits a standard 3-pole MCCB footprint on the DIN rail or panel-mount plate. Maximum power loss is 12 W at rated load, which matters for thermal budgeting inside a sealed enclosure.
Integration Notes
This MCCB mounts in a standard 3-pole molded-case footprint. The 76.2 mm width (3 inches) matches the common SENTRON 3VA panel cutout; the 70 mm depth leaves clearance for rear-mounted busbars or a shunt-trip wiring harness. The shunt trip (STL) release requires a separate control voltage to trip — verify polarity and voltage rating from the Siemens accessory catalog before wiring, as the coil is polarity-sensitive on DC circuits. No communication function, no ground-fault monitoring, no undervoltage release on this variant. If you need remote status or GF protection, step up to the 3VA1 or 3VA2 series with the appropriate electronic trip unit and communication module.