What this MCCB carries and where it fits
The 3VA1120-5ED36-0AA0 is a SENTRON molded case circuit breaker from Siemens, designed for line protection in 3-pole configuration with a TM210 thermal-magnetic release. Rated 20 A continuous at 40 °C through 55 °C, it derates to 19 A at 60 °C and holds there through 70 °C — so in a warm panel you lose 1 A, not a full trip curve shift. Interrupting capacity hits 187 kA at 240 VAC, 121 kA at 415 V, 75.6 kA at 440 V, and still 17 kA at 500 V and 690 V — that's a high-fault-rated breaker for distribution boards where upstream transformer capacity is substantial. Footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — three standard 25 mm module widths on a DIN rail, which means it drops into a 3-module slot in most SENTRON panelboards without adapters. IP40 on the front keeps dust out of the enclosure; the back and sides rely on the panel's own IP rating.
Thermal-magnetic release and line protection duty
The TM210 release is a fixed thermal-magnetic type — no interchangeable trip units, no electronic adjustments. That keeps the part simple and repeatable for BOM-locked line protection where you want the same trip characteristic every time. Rated insulation voltage is 800 V, so it's comfortable in 480Y/277 V and 600 V delta systems with margin. Maximum power loss at rated current is 12 W — negligible for panel thermal budgeting but worth noting if you're packing multiple breakers in a sealed enclosure. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. That covers most indoor industrial environments including unheated warehouses. No undervoltage release, no shunt trip, no communication function on this variant — it's a straight thermal-magnetic breaker for basic overcurrent and short-circuit protection.