What this MCCB carries and where it fits
The Siemens 3VA1020-2ED36-0CA0 is a 3-pole SENTRON molded case circuit breaker rated for line protection, with a TM210 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR). The TM210 release means the thermal pickup is fixed at 20 A — no field adjustment on the thermal element — and the magnetic short-circuit trip is set to 210 A (10x In). That 20 A rating holds flat from 40 °C up to 55 °C, then derates to 19 A at 60 °C and 65 °C, and stays at 19 A through 70 °C. For a panel builder, that means you can run it at full rating in a warm enclosure without derating until you cross 55 °C ambient. Breaking capacity is 52.5 kA at 240 V AC, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. That covers most industrial distribution panels fed from a transformer up to about 1000 kVA. The rated insulation voltage is 800 V, so it's comfortable on 690 V line-to-line systems common in European motor control centres. The undervoltage release (UVR) is factory-fitted — it trips the breaker when the control voltage drops below a threshold, which is typical for emergency-stop circuits or undervoltage protection on motor feeders. No communication module, no ground-fault monitoring on this variant; it's a straight line-protection breaker with a UVR coil.
Panel fit and thermal budget
Dimensions are 76.2 mm wide (3 in), 130 mm tall (5.12 in), and 70 mm deep (2.76 in). That's a standard 3-pole MCCB footprint — it occupies three 25.4 mm module positions on a DIN rail or mounting plate. The 14.5 W maximum power loss at rated current matters when you're doing a heat rise calculation in a sealed enclosure; that's about the same dissipation as a small contactor coil held in continuously. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. That covers unheated electrical rooms and outdoor enclosures in most climates, though the derating curve above 55 °C needs to be factored into the load schedule.
How it compares to the 3VA1020-3ED36-0AA0
The closest peer is the 3VA1020-3ED36-0AA0. Both are 3-pole, 20 A, TM210 breakers with the same breaking capacity curve. The difference is the undervoltage release: the -2ED36-0CA0 carries the UVR factory-fitted; the -3ED36-0AA0 does not. If your panel already has a separate undervoltage relay or you don't need UVR, the -3ED36-0AA0 is a drop-in replacement with the same footprint and ratings. If the UVR is part of the safety circuit design, stick with this -2ED36-0CA0 variant — retrofitting a UVR later means swapping the breaker or adding an external module.