SENTRON 3VA2225-5JQ32-0DH0 — Molded Case Circuit Breaker, Line Protection Duty
The Siemens SENTRON 3VA2225-5JQ32-0DH0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels and industrial switchgear. Its 250 A full-scale rating with an adjustable trip range from 50 A to 250 A covers feeder and main breaker applications in 400 V to 690 V networks. Rated 250 A continuously at ambient temperatures up to 50 °C without derating — above that the thermal curve steps down: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. That means the breaker holds its full rating across typical panel internal temperatures; derating only becomes a factor in hot enclosures or adjacent to high-wattage devices. Interrupting capacity is declared per voltage level: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V. These figures define the maximum fault current the breaker can safely clear at each system voltage — critical for selectivity studies and SCCR compliance in industrial panels.
Built-in Auxiliaries and Communication
This variant ships with an undervoltage release (UVR) and a 2-auxiliary-switch plus 1-trip-alarm-switch HQ configuration. The UVR trips the breaker when control voltage drops below a threshold, which is standard for emergency-stop circuits and safety-related disconnection where loss of control power must open the main contacts. Communication function is present on this order code, enabling integration with higher-level monitoring or energy management systems. The basic switch variant underlying this assembly is 3VA2225-5JQ32-0AA0. Maximum power loss is 50.5 W — a figure to account for in enclosed panel thermal calculations, especially when multiple breakers are ganged in a single enclosure.
Physical Fit and Environmental Range
Dimensions are 86 mm depth, 105 mm width, 181 mm height — a standard 3-pole MCCB footprint that fits SENTRON 3VA mounting bases and common DIN-rail or panel-mount adapters. Storage range spans -40 °C to 80 °C; operating ambient runs -25 °C to 70 °C.