MCCB with ETU560 — what the ratings mean for fit
The Siemens SENTRON 3VA2125-7JQ36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current of 25 A, with no derating required across the full ambient range from 40 °C through 70 °C — all seven temperature points list the same 25 A rating, so the thermal curve is flat within that band. That is unusual for an MCCB; most units start derating above 40 °C. The ETU560 electronic trip unit gives you adjustable time-current curves (tr min 0.5 s, tr max 25 s; tsd max 0.5 s) for selective coordination downstream. Breaking capacity is the headline number for a line-up MCCB: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.8 kA at 690 V. The 330 kA at 240 V is a high-interrupting rating — suitable for transformer secondary or large busway protection where fault current is severe. The 3.8 kA at 690 V is the limit for 690 V line-ups; verify your available fault current at that voltage before specifying.
Panel integration and footprint
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard 3-pole MCCB footprint for the SENTRON 3VA platform. The IP40 front protection means it is suitable for enclosed panel mounting where the door or cover provides the environmental seal; not rated for washdown or outdoor exposure on its own. Rated insulation voltage is 800 V, so it can be applied in 690 V systems with margin. Maximum power loss is 0.6 W — negligible for thermal budgeting inside a crowded enclosure. Latching endurance is 20,000 cycles, which is typical for a line-protection MCCB not used for frequent switching duty. Operating temperature range spans -40 °C to 70 °C, with storage from -40 °C to 80 °C.