The Siemens SENTRON 3VA1020-4ED32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. It carries a continuous current Iu of 20 A at 40 °C, with the TM210 thermal-magnetic overcurrent release handling the trip curve. Interrupting capacity hits 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V — solid for downstream fault isolation in distribution panels.
What the ratings mean for fit
The 20 A rating holds flat from 40 °C through 50 °C — no derating needed in a warm enclosure — then steps down to 19.2 A at 55 °C and 18 A at 70 °C. That thermal curve matters when you're packing breakers tight on a DIN rail; the 70 mm depth and 76.2 mm width leave room for gland plates and wiring troughs in a standard distribution board. The TM210 release is a fixed thermal-magnetic type — no interchangeable trip units, so what you see on the nameplate is what you get. That simplifies BOM traceability but locks the rating; if the load changes, you swap the whole breaker, not the trip pack. Auxiliary contacts are built in: 2 auxiliary switches plus 1 trip alarm switch (HQ designation). That saves an add-on module slot and gives the PLC a direct fault signal without extra wiring. No undervoltage release, no ground-fault monitoring, no communication function — this is a straight line-protection breaker, not a smart device.
Where it fits in a panel
130 mm height and 70 mm depth fit standard enclosures. IP40 on the front suitable for indoor switchgear. Operating range spans -25 °C to 70 °C; storage from -40 °C to 80 °C. That covers most plant-floor environments short of freezer tunnels or oven-side locations.