The 3VA1020-4ED36-0AF0: At 240 V the 121 kA SCCR lets this MCCB sit upstream of downstream breakers without cascading failure, provided the let-through energy is coordinated.
Thermal derating and ambient range
The breaker holds 20 A from 40 °C through 55 °C, then derates to 19 A at 60 °C and 65 °C, and stays at 19 A through 70 °C. The TM210 release is fixed thermal-magnetic — no electronic adjustment, which simplifies spares but limits field tweaking.
Auxiliary and alarm contacts
The trip alarm signals on overcurrent or short-circuit trip — useful for remote fault annunciation on a PLC DI.
Footprint is 76.2 mm wide (3 in), 130 mm tall (5.12 in), 70 mm deep (2.76 in). The 70 mm depth includes the handle throw; allow clearance for arc-chamber venting per Siemens mounting instructions.