What this MCCB delivers
The Siemens SENTRON 3VA2125-5JQ32-0AA0 is a 3-pole molded case circuit breaker rated for 25 A continuous current (Iu) with an ETU560 electronic trip unit. Its headline breaking capacity hits 187 kA at 240 V, dropping to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V — so it handles high-fault utility feeds at lower voltages but derates sharply above 500 V. The 25 A rating holds flat from 40 °C through 70 °C, meaning no thermal derating in a warm panel up to that ceiling. The ETU560 release gives you adjustable long-time, short-time, and instantaneous protection curves plus ground-fault monitoring via summation current formation on the L-conductor. It also carries a communication function, so it can report status or trip events to a higher-level system. The front face is IP40 rated, suitable for enclosed panel mounting.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that bolts into a SENTRON distribution panel or a custom sub-feed section. The 86 mm depth (3.39 in) leaves clearance for rear-connected busbars or cable ducts behind the mounting plate. The optional motor drive allows remote racking-in or -out without opening the door, useful for automated testing or emergency disconnect sequences. No undervoltage release or voltage trigger is fitted on this variant; if you need UVR, you will order a different suffix.
What the ETU560 release means for coordination
The ETU560 is an electronic trip unit with LSI protection — long-time (overload), short-time (selective), and instantaneous (magnetic). Because it is electronic, it holds its trip curve accuracy across the ambient range (-25 °C to 70 °C operating) better than a thermal-magnetic breaker. That matters when you are coordinating downstream branch breakers: the short-time delay band lets you achieve selectivity up to the breaker's withstand rating, so a fault on a feeder does not take out the main. The ground-fault function monitors residual current via summation of the three phase conductors — set the pickup level per the installation's earth-leakage requirements. Maximum power loss is 0.6 W, negligible for panel heat-budget calculations.