The Siemens SENTRON 3VA1020-3ED36-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection duty. It carries a continuous current of 20 A at 40 °C, with minimal derating up to 70 °C where it still holds 19 A. The interrupting capacity reaches 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V, making it suitable for high-fault panels where SCCR headroom matters.
Breaking capacity and selectivity
At 690 V the breaker still clears 7.5 kA, which covers most industrial motor-drive circuits at that voltage level. The rated insulation voltage is 800 V, so the internal clearances are sized for 690 V systems with margin. Maximum power loss is 14.5 W — a figure to check against enclosure thermal rise in a densely packed panel.
Built-in undervoltage release
This variant ships with an undervoltage release (UVR) as the auxiliary release, plus two HQ auxiliary switches. The UVR lets you trip the breaker on loss of control voltage — common in safety circuits or emergency-stop chains where a downstream contactor also drops out. No ground-fault monitoring or communication module is fitted; this is a straight line-protection MCCB.
Panel fit and environment
The case measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON distribution panels without re-drilling the gland plate. Operating temperature range is -25 °C to 70 °C; storage range extends to -40 °C to 80 °C, so it handles seasonal warehouse swings before installation.