The Siemens 3VA1020-3ED32-0KH0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. Rated 20 A continuous at 40 °C, it carries a TM210 thermal-magnetic release — fixed thermal and magnetic trip settings, no adjustment dial. The 3-pole unit breaks up to 75.6 kA at 240 V and 52.5 kA at 415 V, which covers most commercial and light industrial fault levels without cascading upstream.
Breaking capacity and selectivity
The interrupting ratings step down with voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. At 415 V the 52.5 kA figure gives selectivity headroom against a 50 kA prospective fault — useful when coordinating downstream MCBs in a multi-level panel. The 690 V rating is lower, so verify the available fault current if feeding a 690 V bus.
Thermal derating and ambient limits
Full 20 A rating holds through 50 °C ambient. Above that it derates linearly to 18 A at 70 °C. The operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C. In a sealed panel with multiple breakers ganged, factor the 55 °C+ derating into the load schedule.
Auxiliaries and trip options
Factory-fitted with a shunt trip (STL) release for remote tripping — order code 3VA9688-0BL33 for the integrated auxiliary trip block. The auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm switch (HQ type). No undervoltage release, no ground-fault monitoring, no communication module on this variant. The front face carries IP40 protection; the body is open for panel internal airflow.
Lifecycle and sourcing
Listed as current production — no phase-out notice on this order code. The 3VA platform is Siemens' active MCCB family, so factory support and replacement auxiliaries are standard. Sourced and quoted to order against an RFQ; availability and current pricing confirmed at quote time.