SENTRON 3VA2125-7MQ36-0AA0 — motor protection MCCB with ETU860M release
The Siemens 3VA2125-7MQ36-0AA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) configured for motor protection, carrying a rated continuous current (Iu) of 25 A that holds flat from 40 °C through 70 °C ambient — no derating needed across that band. The ETU860M electronic overcurrent release provides phase-failure detection and ground-fault monitoring via summation current formation on the L-conductor. Interrupting capacity reaches 330 kA at 240 V AC, 242 kA at 415 V and 440 V, and 187 kA at 500 V, dropping to 3.8 kA at 690 V. The 800 V rated insulation voltage (Ui) covers most industrial distribution voltages. This is the motor-protection variant, so the trip curve and release logic are tuned for motor-start inrush rather than general distribution loads.
Panel fit and integration
The 3VA2125-7MQ36-0AA0 measures 105 mm wide, 181 mm tall, and 86 mm deep — a standard MCCB footprint that fits most DIN-rail or screw-mounted panel layouts. The IP40 front protection (IP40 on the front) means it is suited for enclosed switchgear where the cabinet door provides the environmental seal. Communication function is onboard, so it can integrate with higher-level monitoring systems for status and trip data. Maximum power loss is 10 W, manageable in a ventilated enclosure.
Operating power and endurance
Rated operating power in AC-3 duty (motor switching) is 5.5 kW at 230 V and 11 kW at 400 V. Latching endurance is rated at 20,000 operations — this governs the mechanical life for the motor-starting application. Storage temperature range spans -40 °C to 80 °C, operating range -40 °C to 70 °C. The reference code per DIN EN 81346-2 is Q (switching device).