What this MCCB delivers for the line
The Siemens 3VA1020-4ED36-0HH0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for continuous current of 20 A across the 40 °C to 55 °C band, derating to 19 A at 60 °C through 70 °C. That thermal stability means it holds its full rating in a warm panel without forced cooling — a common concern when breakers are ganged on a DIN rail. Breaking capacity is the headline: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and still 11.9 kA at 500 V and 690 V. Those numbers cover high-fault scenarios common in industrial distribution — a 121 kA SCCR at 240 V means it safely interrupts a fault up to that level without cascading upstream, critical for panel selectivity studies. The TM210 thermal-magnetic release handles overload and short-circuit protection in one package — no electronic trip unit to program, no auxiliary power needed. Trip indicator is present for quick visual fault isolation during a line-down event.
Panel fit and integration
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. That 70 mm depth is shallow enough for a 200 mm deep enclosure with wiring space behind — common in retrofit panels where back-panel clearance is tight. Front-face protection class IP40 means it's splash-protected against tools and fingers in a dry enclosure interior, but not for washdown. Mounts on a standard DIN rail or direct-panel footprint per SENTRON 3VA installation guidelines. Rated insulation voltage Ui of 800 V gives headroom for 690 V line-to-line systems without derating the dielectric. Maximum power loss is 12 W — negligible for thermal budget in a ventilated panel, but worth checking if the breaker is sealed in a non-vented enclosure with other heat sources.
Lifecycle and sourcing posture
No undervoltage release, no ground-fault monitoring, no communication function. This is a straight thermal-magnetic breaker — no electronic trip, no Modbus, no auxiliary power supply. If your spec calls for those, you're looking at a different 3VA variant.