The Siemens SENTRON 3VA1020-2ED36-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection duty, carrying 20 A continuously at 40 °C ambient and delivering a breaking capacity of 52.5 kA at 240 V AC — sufficient for most commercial and light-industrial distribution panels where fault currents stay under that threshold.
Breaking capacity and selectivity
The interrupting rating drops as system voltage rises: 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. That 7.5 kA floor at 690 V tells you this breaker is not sized for high-fault industrial mains at higher voltages — it belongs downstream in a selectively coordinated sub-distribution where the upstream device limits let-through to that level.
Thermal rating and ambient derating
The 20 A rating holds flat 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. That means in a warm enclosure — say a non-ventilated panel near a process line — you lose only 1 A of headroom. The maximum power loss is 14.5 W, which factors into enclosure thermal calculations if you are stacking multiple breakers.
Built-in undervoltage release
This variant includes an undervoltage release (UVR) as the auxiliary release, plus two auxiliary switches (HQ design). The UVR trips the breaker when supply voltage drops below a set threshold — common on safety circuits or motor feeder disconnects where you want automatic opening on brownout or loss of control power. The auxiliary switches provide remote status feedback.
Physical fit and panel integration
The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint that fits Siemens SENTRON mounting accessories and most DIN-rail or screw-mount panel layouts. Rated insulation voltage is 800 V, so it handles 690 V systems with margin. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.