Solcon RVS-DN Heavy Duty Soft Starter 17-3300A 230-1200V 3Ph

Solcon designs the RVS-DN for severe operating conditions and specifies it for marine and mining installations. Concretely that means ambient operation up to 140 °F (60 °C), operation without a bypass contactor up to 820 A, robust construction built to meet Marine Industry standards up to 3,300 A, and automatic firing angle triggering so the starter still fires correctly when supply voltage and frequency are unstable (marine, offshore and generator operation).

The RVS-DN is rated for continuous operation without a bypass contactor up to 820 A at 122 °F (50 °C). In that range the thyristors carry the running current directly, so you save the contactor itself, the panel space it occupies, and the wiring and maintenance that go with it. Above 820 A, a bypass contactor is required — or you can order option 9 "Preparation for Bypass", in which case all protections remain active.

Inside-delta (also called 6-cable) connection opens the motor winding delta point and inserts the starter into each phase winding, so the same starter frame can drive a larger motor than in line (3-cable) connection. The RVS-DN supports inside-delta connection up to 690 V. It requires a motor with all six winding ends brought out.

Yes — and this is a specific design strength. Older diesel generator sets, especially those with low-cost voltage regulators, produce unstable voltage and frequency that cause irregular SCR firing. The RVS-DN has automatic firing angle triggering that overcomes this voltage and frequency instability, which is why Solcon positions it for marine, offshore and generator operation.

RVS-DN covers 17-3,300 A at 230-1,200 V. To select correctly we need: (1) motor nameplate data (power, current, voltage, poles, efficiency, power factor); (2) load type (pump, conveyor, compressor, fan, ball mill, mixer); (3) the torque-versus-speed load curve; (4) load inertia; (5) supply voltage and frequency; (6) starts per hour; (7) whether line or inside-delta connection will be used; (8) ambient temperature; (9) any required options (Modbus, Profibus, marine approval, UL version, remote display, conformal coating). Provide these and we will confirm the exact type code.

The format is RVS-DN - [rated current] - [mains voltage] - [control voltage] - [control input voltage] - [options]. For example RVS-DN-31A-480V-230V-230V-3P is a 31 A unit on a 480 VAC mains supply, with 230 VAC control voltage, 230 VAC control input voltage and Profibus communication. Option codes: 3M Modbus, 3P Profibus, 4 insulation test, 5 analog output, 8 conformal coating, 9 preparation for bypass contactor, D remote display, M marine approval, U UL standard (current ratings A-C).