Siemens SENTRON 3VA1020-4ED36-0AH0 — 20 A MCCB with TM210 Release
The Siemens SENTRON 3VA1020-4ED36-0AH0 is a 3-pole molded case circuit breaker rated for line protection, carrying a continuous current Iu of 20 A and a rated insulation voltage Ui of 800 V. The interrupting capacity hits 121 kA at 240 V and 75.6 kA at 415 V — numbers that tell you this breaker handles high-fault-current scenarios without cascading upstream. The TM210 thermal-magnetic release is fixed, so there's no dial to adjust the trip curve; what you see on the nameplate is what you get in the panel. Thermal derating is flat from 40 °C through 50 °C at 20 A, then drops to 19.2 A at 55 °C and 18 A at 70 °C. If your panel ambient runs hot — say, a packed enclosure near a conveyor drive — that 18 A at 70 °C is the number to size against, not the 20 A label. The auxiliary contact configuration ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type), which gives you a clean signal back to the PLC or HMI when the breaker trips.
Integration — Panel Fit and Auxiliary Wiring
The 3VA1020-4ED36-0AH0 measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON distribution panels without re-drilling the mounting plate. The front face carries an IP40 rating, meaning it's protected against tools and wires >1 mm but not against water ingress; keep it inside a closed enclosure. The TM210 release has no undervoltage release, no voltage trigger, and no communication function — it's a pure thermal-magnetic breaker with a trip indicator. Wire it as a standalone line protector, not as a remote-controlled or communicating device.