MCCB with ETU850 release and communication — what the ratings mean for panel fit
The Siemens 3VA2010-5KP32-0DC0 is a SENTRON 3VA2 molded case circuit breaker rated for 100 A continuous current (Iu) at 40 °C, with the ETU850 electronic trip unit providing adjustable overload and short-circuit protection curves. The 187 kA breaking capacity at 240 V drops to 121 kA at 415 V and 440 V, then to 79 kA at 500 V, and 3.4 kA at 690 V — the SCCR headroom at typical 400 V distribution voltages means this breaker clears high-fault scenarios without cascading upstream, which matters for selective coordination studies on a main or feeder position. The 100 A rating holds flat through 50 °C, then derates linearly to 85 A at 70 °C — a panel builder stacking breakers in a warm enclosure should account for that thermal curve rather than assuming the full 100 A at the ambient the cabinet actually sees. The 800 V rated insulation voltage (Ui) covers 480 V and 600 V class systems with margin.
Dimensions and panel integration
At 105 mm wide, 181 mm tall, and 86 mm deep, this 3-pole MCCB fits the standard SENTRON 3VA2 mounting footprint. The depth of 86 mm is the dimension that governs gland-plate clearance in a shallow backpanel — verify the enclosure depth allows for rear connection access and the undervoltage release (UVR) module that ships with this variant. The auxiliary contact version carries 2 HQ switches, and the integrated auxiliary trip is order code 3VA9608-0BB25. The supplied basic switch is 3VA2010-5KP32-0AA0 — these are the factory-matched accessories, not field-retrofit options.
Lifecycle and sourcing posture
The ETU850 release supports communication function and other measurement functions, which means this breaker can report load data and event logs over the integrated comms interface — useful for a panel that feeds into a building management or power monitoring system without a separate metering module.
Thermal and electrical endurance
Latching endurance is rated at 20,000 operations — a mechanical life figure that applies to the switching mechanism, not the electrical endurance under load. For motor-switching or frequent ON/OFF cycles, derate per the manufacturer's electrical endurance curve (not in this evidence set). Power loss is 16 W maximum at rated current, which contributes to the enclosure heat load calculation. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage minimum is the handling limit, not the running limit — the breaker can sit in a cold warehouse but must be within the operating range before energizing.