Line protection MCCB with full breaking capacity across the voltage range
The SENTRON 3VA1020-4ED36-0CH0 is a 3-pole molded case circuit breaker (MCCB) rated for 20 A continuous current at 40 °C, designed for line protection in distribution panels. Its breaking capacity reaches 121 kA at 240 V AC and holds 75.6 kA at 415 V, tapering to 11.9 kA at 690 V — so it clears high-fault scenarios on the low-voltage side while maintaining adequate interruption for 400 V-class industrial feeds. The 800 V rated insulation voltage confirms it is insulated for 690 V systems with margin. Rated current holds flat at 20 A from 40 °C through 55 °C, then derates to 19 A at 60–70 °C (–). That means no de-rating penalty in a typical 50 °C panel interior, but you lose 1 A if the enclosure runs hot. Maximum power loss is 14.5 W — a modest thermal load for a 3-pole MCCB in a ventilated section.
Built-in undervoltage release and dual auxiliary switches
This variant ships with an undervoltage release (UVR) integrated plus two auxiliary switches and one trip alarm switch (HQ). The UVR drops the breaker on loss of control voltage — standard for safety circuits where a downstream motor starter must not re-energize unattended. The auxiliary contacts provide status feedback to a PLC or panel lamp without an external interposing relay. The trip indicator gives a local mechanical flag showing the breaker tripped on fault versus manual off — useful for a technician walking a line-down panel to quickly identify the faulted circuit.
Panel fit and mounting
At 76.2 mm wide, 130 mm tall, and 70 mm deep, this MCCB occupies a standard 3-pole footprint for the 3VA platform. It mounts via screw-clamp to a backplate or DIN rail adapter (not included). The 70 mm depth leaves clearance behind a 200 mm deep enclosure for wiring and busbar connections.