SENTRON 3VA2040-6HN36-0AA0 — 40 A MCCB with ETU350 Trip Unit
The Siemens 3VA2040-6HN36-0AA0 is a SENTRON molded case circuit breaker rated for 40 A continuous without derating all the way up to 70 °C ambient — that means this breaker holds its full rating even in a hot panel next to drives or transformers, so you don't have to oversize the frame for temperature margins. It carries an ETU350 electronic overcurrent release, which gives you adjustable long-time, short-time, and instantaneous pickup settings — not a fixed thermal-magnetic curve, so you can fine-tune coordination with downstream breakers on a distribution board or motor branch circuit. Interrupting capacity is substantial: 242 kA at 240 V, 187 kA at 415 V, and still 121 kA at 500 V. That's enough to handle high-fault-current scenarios like transformer secondaries or large motor control centers without worrying about cascading failure upstream.
Panel Fit and Integration
The 3VA2040-6HN36-0AA0 is a 3-pole breaker that mounts on DIN rail or direct panel. Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — that's a 4.13 x 7.13 x 3.39 inch footprint. The front face carries IP40 protection, meaning it's sealed against tools and fingers but not against water spray; keep it inside a closed enclosure. No undervoltage release, no communication module, no ground-fault monitoring on this variant — it's a straight line-protection breaker with the ETU350 trip unit. The power loss at full load is only 2.2 W, so heat buildup in a dense panel is negligible.
Environmental and Compliance
Operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C. That covers most indoor industrial environments, including unheated warehouses and production floors near ovens or chillers. Rated insulation voltage is 800 V, and the breaker is designed for line protection in low-voltage switchgear per IEC/EN 60947-2. The IP40 front rating means it's suitable for installation in a standard electrical enclosure with a door.