Siemens 3VA1040-3ED36-0CC0 — 40 A SENTRON MCCB for Line Protection
The Siemens 3VA1040-3ED36-0CC0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated 40 A continuous at 40 °C, designed for line protection in distribution panels. Its interrupting capacity hits 75.6 kA at 240 V and 52.5 kA at 415 V, so it handles high-fault scenarios typical of industrial mains without cascading upstream. The unit ships with a factory-fitted undervoltage release (UVR) and two auxiliary switches HQ — that's the '3ED36-0CC0' suffix telling you the accessory complement is locked in from the factory, not field-added.
Interrupting Ratings and Coordination
This breaker's interrupting curve is steep: 75.6 kA at 240 V, dropping to 52.5 kA at 415 V, then 32 kA at 440 V, and settling at 7.5 kA from 500 V up to 690 V. For a 480 V panel common in North American plants, the 32 kA at 440 V figure is the closest reference — enough for most transformer-fed services. The 800 V rated insulation voltage means the internal clearances support 690 V line-to-line without derating the insulation system, though the interrupting rating at that voltage is the binding limit for fault clearing.
Mounting and Panel Fit
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON distribution blocks and panelboard mounting bases. The 70 mm depth is shallow enough for 200 mm deep enclosures without crowding the gland plate. No communication function on this variant, so it's a straight electromechanical breaker with no Modbus or PROFIBUS bridge inside.
Thermal Derating and Power Loss
Rated 40 A continuously from 40 °C up to 50 °C ambient. At 55 °C it derates to 38.4 A, and at 70 °C it holds 36 A — a gentle slope that keeps the breaker usable in hot switchgear rooms without oversizing. Maximum power loss is 13.3 W, so in a multi-breaker panel the cumulative heat stays manageable without forced ventilation.