SENTRON 3VA2 MCCB with ETU320 — 250 A, 3-Pole, Line Protection
The Siemens 3VA2225-7HL32-0JL0 is a SENTRON molded case circuit breaker (MCCB) rated for a continuous current Iu of 250 A across a 40 °C to 50 °C ambient, with a 3-pole configuration and an ETU320 electronic overcurrent release. The ETU320 provides adjustable thermal-magnetic or electronic protection curves for line protection duty — the product version is explicitly designated for line protection, not motor or generator protection. Breaking capacity reaches 330 kA at 240 V and 242 kA at 415 V, with a steep drop to 6.3 kA at 690 V, so the part is sized for low-voltage distribution panels where high fault currents at 240/415 V are the design case.
Breaking Capacity and Selectivity Planning
The 3VA2225-7HL32-0JL0 delivers 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 6.3 kA at 690 V. The high 240 V figure suits it for North American 240/120 V split-phase or 240 V delta panels where available fault current is high. At 690 V the 6.3 kA rating is modest — the breaker is not intended for 690 V main service; it is a downstream feeder or branch device at that voltage. The rated insulation voltage Ui of 800 V confirms the insulation system can handle 690 V line-to-line, but the interrupting rating governs the application.
Panel Integration and Mounting
Dimensions are 181 mm height, 105 mm width, 86 mm depth — a standard 3-pole MCCB footprint for DIN-rail or screw-mount panel integration. Maximum power loss is 48 W, so ventilation or derating within the enclosure should account for that thermal load. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The trip indicator and voltage trigger are present, aiding fault diagnosis without opening the panel.
Endurance and Release Configuration
Mechanical endurance is rated at 20,000 cycles (latching endurance). The ETU320 release is an electronic trip unit; no undervoltage release, no communication function, no phase failure detection, and no ground fault monitoring version are fitted on this variant. The auxiliary contact version includes 2 auxiliary switches plus 1 trip alarm and 1 electrical alarm switch (HQ), providing status feedback for PLC or SCADA inputs.