The Siemens SENTRON 3VA2125-7JP46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for a continuous current of 25 A across the full ambient temperature range from 40 °C to 70 °C, with no derating needed. It is fitted with an ETU550 electronic trip unit, which provides adjustable time-current protection curves—a key feature for coordinating with downstream devices in a selective coordination study. The breaker carries a breaking capacity of 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, making it suitable for high-fault-current installations such as main service entrance or large distribution switchboards.
Trip unit and protection settings
The ETU550 electronic trip unit supports adjustable long-time pickup (Ir), long-time delay (tr adjustable from 0.5 to 25 seconds), short-time pickup and delay, instantaneous pickup, and ground-fault protection (when the neutral protection is configured). The N-conductor protection is adjustable: OFF, 40%, up to 160% of the phase rating. This programmability allows the breaker to be fine-tuned for cable protection, motor branch circuits, or generator feeders without swapping trip units.
Physical integration
The breaker measures 140 mm wide, 181 mm high, and 86 mm deep. It mounts on a DIN rail or can be screw-fixed to a mounting plate in a standard enclosure. The IP40 protection rating on the front means it is protected against solid objects larger than 1 mm—adequate for indoor panel environments, but not for washdown or outdoor exposure without an additional enclosure. The 4-pole construction (3 phases + neutral) is typical for three-phase four-wire systems where the neutral must be switched and protected.
Communication capability
A communication function is present on this variant, enabling integration with higher-level control or energy management systems. This allows remote reading of trip events, load current, and status, which supports the audit trail for a GMP-regulated environment where undocumented changes are unacceptable. The specific protocol (e.g., PROFIBUS, PROFINET, Modbus) is not defined in the base listing and should be confirmed from the full order code extension or the communication module fitted.