What this MCCB delivers
The Siemens SENTRON 3VA1020-2ED36-0JH0 is a 3-pole molded case circuit breaker rated for 20 A continuous current (Iu) and built for line-protection duty with a TM210 thermal-magnetic release. At 240 V it interrupts 52.5 kA; at 415 V that figure holds at 32 kA, and at 440 V it still clears 13.6 kA — meaning this breaker handles high-fault scenarios common in industrial distribution panels without needing an upstream current-limiting fuse. The thermal-magnetic curve stays flat across the 40 °C to 50 °C band — still rated 20 A — then derates gradually to 18 A at 70 °C. That matters for a panel builder: if the breaker sits in a warm enclosure near other heat sources, you can still count on full rating up to 50 °C without a derate factor.
Mounting and integration
The 3VA1020-2ED36-0JH0 measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint that drops into a SENTRON panelboard or a separate DIN-rail adapter. The front face carries IP40 protection, so it's suited for enclosed distribution boards where incidental tool contact is the main concern. Auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm switch (HQ designation). That gives you two independent signal paths for status feedback (open/closed) and a dedicated alarm contact that changes state only on a trip event — useful for remote annunciation without tying up a PLC input on the breaker's main position.
Auxiliary release and accessories
The breaker ships with a shunt trip (STL) auxiliary release for remote tripping. The integrated auxiliary trip accessory is order code 3VA9688-0BL32 — that's the part number to add if you need a separate undervoltage release or additional shunt trip capability. No undervoltage release is fitted as standard; no communication module or phase-failure detection is built in, so this is a straightforward thermal-magnetic breaker without electronics.