SENTRON 3VA1020-4ED32-0CH0 — 20 A MCCB, line protection, 3-pole
The Siemens SENTRON 3VA1020-4ED32-0CH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 20 A at 40 °C through 55 °C, derating to 19 A at 60–70 °C. Interrupting capacity is the headline here: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V — giving you serious fault-clearing headroom even on high-capacity transformers. Rated insulation voltage is 800 V, so the breaker's internal creepage and clearance are designed for 690 V line-to-line systems with margin.
Auxiliary complement and undervoltage release
This variant ships with an undervoltage release (UVR) integrated and two auxiliary switches plus one trip-alarm switch (HQ) factory-fitted — no field-add kit needed for shunt-trip or status-signal applications. The UVR drops the breaker on loss of control voltage, which is standard for emergency-stop or undervoltage-protection schemes in machine-tool and conveyor panels.
Physical fit and panel integration
Footprint is 76.2 mm wide (3 in), 130 mm tall (5.12 in), 70 mm deep (2.76 in) — standard 3-pole MCCB envelope for DIN-rail or screw-mount panel assembly. Maximum power loss of 14.5 W at rated load; factor that into enclosure thermal calculations if the panel is sealed or has limited convection.