1. Main Specifications| Rated Operational Voltage | 208 ... 600 V AC | | Rated Control Supply Voltage (Us) | 100 ... 250 V AC | | Rated Control Circuit Voltage (Uc) | 24 V DC | | Rated Frequency (f) | 50/60 Hz Main Circuit 50 / 60 Hz | | Package Level 1 Depth Length/Height/Width | 282 MM 388 MM 200 MM | | Package Level 1 Gross Weight | 5.7 kg |
2. Key Selling PointsHigh-Performance Soft Starter for Small-to-Medium Motors:The PSTX85-600-70 is a premium solid-state soft starter from ABB’s PSTX series, designed for 600 V AC systems with a rated current of 85 A, capable of starting motors up to approximately 45 kW (60 HP)—ideal for pumps, fans, and compressors. Soft Starting with Reduced Electrical & Mechanical Stress:Uses thyristor phase control to gradually ramp up motor voltage,
limiting inrush current to 1.5–5x full load current, minimizing voltage dips and mechanical shock during start-up. Integrated Bypass Contactor for High Efficiency:Built-in bypass contactor automatically switches to direct-on-line operation after start-up,
bypassing the thyristors. This reduces power losses and heat
generation, improving energy efficiency during continuous
operation. Comprehensive Motor and Load Protection:Features include overload, stall, phase loss, phase imbalance,
thyristor overtemperature, start time-out, and underload protection
(useful for pump dry-run detection)—ensuring safe and reliable
operation. Multiple Start/Stop Modes for Complex Loads:Supports voltage ramp, current limit, kick start (Kick Start™), soft stop, and pump stop modes—ideal for high-inertia or sticky loads such as sludge pumps
or mixers.
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