MCCB with ETU550 — 25 A continuous, 4-pole, high interrupting capacity
The Siemens SENTRON 3VA2125-6JP46-0AA0 is a 4-pole molded case circuit breaker rated for 25 A continuous current, fitted with the ETU550 electronic trip unit. It is designed for line protection in distribution panels and switchboards where selective coordination and adjustable trip curves are required. The interrupting capacity reaches 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V — figures that govern its fault-clearing capability at each voltage level.
What the ratings mean for fit
The 25 A continuous rating is the breaker's nominal current under steady load — it is not a trip threshold but the current the breaker carries without exceeding its thermal limits. The ETU550 trip unit provides adjustable overload and short-circuit protection, so the breaker can be coordinated downstream of a larger feeder or upstream of branch circuits. The interrupting ratings (–) are the maximum fault currents the breaker can safely interrupt at each system voltage; at 690 V the 3.7 kA figure means this breaker is not suitable for high-fault 690 V applications — that voltage class typically requires a higher-rated frame. The 4-pole construction suits three-phase systems with a switched neutral or where all poles must open simultaneously.
Integration and mounting
The breaker measures 86 mm deep, 140 mm wide, and 181 mm high. It mounts in a standard panel or enclosure footprint for 4-pole MCCBs of this frame size. The front face carries IP40 protection.