What this MCCB is and where it fits
The Siemens 3VA1140-6EF36-0CC0 is a SENTRON 3VA1 molded case circuit breaker (MCCB) rated for line protection in distribution panels. It's a 3-pole unit carrying 40 A continuously at 40 °C ambient, with the full rated current holding steady up to 50 °C before a gentle derating curve kicks in — 39 A at 55–60 °C, 38 A at 65 °C, 37 A at 70 °C. That thermal profile matters when you're packing breakers into a warm enclosure and need to know your headroom without guessing. Breaking capacity is where this breaker earns its keep: 220 kA at 240 V AC, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA at 500 V and 690 V. That's high-fault rated for a 40 A frame — useful downstream of a large transformer or on a high-capacity bus where a standard MCCB would need upstream fuses for coordination.
Built-in accessories and panel fit
This variant ships with an undervoltage release (UVR) and two auxiliary switches (HQ design) factory-fitted. The UVR trips the breaker when control voltage drops — standard for safety circuits that need a drop-out on power loss. The two aux switches give you status feedback (open/closed) for the PLC or annunciator without adding external interface relays. Dimensions are 76.2 mm wide, 130 mm tall, 70 mm deep — a 3-pole MCCB that fits standard distribution panel mounting. The 800 V rated insulation voltage (Ui) covers 480 V and 600 V class systems with margin.