The Siemens 3VA1020-3ED36-0AC0 is a SENTRON molded case circuit breaker (MCCB) for line protection, 3-pole, with a TM210 thermal-magnetic overcurrent release. It carries a rated current of 20 A at 40 °C, derating to 19 A at 60 °C and above — the full thermal curve is flat to 55 °C, then drops one amp per 5 °C step. Breaking capacity hits 75.6 kA at 240 V AC, 52.5 kA at 415 V, and 32 kA at 440 V, with a floor of 7.5 kA at 500 V and 690 V. The auxiliary switch design is two HQ switches. Rated insulation voltage is 800 V. This is a current-production part.
What the ratings mean for fit
The 20 A rating at 40 °C is the continuous current the breaker carries without tripping in a 40 °C ambient. If your panel runs hotter — say 60 °C inside the enclosure — you must derate to 19 A. The TM210 release is a fixed thermal-magnetic type; no interchangeable trip units, so the breaker is factory-set for 20 A. The 75.6 kA interrupting rating at 240 V means it can safely clear a fault current up to that level without self-destructing or cascading upstream. At 415 V (common in European industrial panels) it still handles 52.5 kA. The 800 V rated insulation voltage covers most 400/480 V systems with margin.
Panel integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint for DIN-rail or screw-mount panel installation. No undervoltage release, no shunt trip, no communication function on this variant. The auxiliary switches (two HQ) are built in, so no separate add-on module needed for status feedback. Power loss is 12 W maximum at rated load — factor that into enclosure thermal calculations.