ABB PSTX300-600-70 Soft Starter

300UN, 600V, 3-phase integrated bypass soft starter from ABB’s PSTX series, providing smooth motor starting and stopping as well as comprehensive motor protection

Parametri chiave: Rated current 300A (AC-53b), rated voltage 208–600V AC, control voltage 100–240V AC, communication protocols: ModBus, EtherNet/IP, BACnet

Funzioni principali: Voltage ramp / torque control start, current limit (standard / dual / ramp), soft stop, integrated bypass contactor, full-featured motor protection

Certificazioni: Conforme alla norma IEC/EN 60947-4-2, UL 508, CSA C22.2 No. 14, CE, CCC

1. Model Number Explanation

2. Complete Technical Specifications

3. Key Advantages
4. Integrated bypass design: Automatically switches to bypass contactor after startup, lowers operating power consumption (≤1.5W) and extends thyristor service life
5. Flexible communication: Built-in Modbus RTU/TCP, EtherNet/IP, BACnet for easy integration into industrial networks
6. Comprehensive protection: Full motor, short-circuit and overload protection in compliance with IEC 60947-4-2
7. Wide voltage compatibility: 208–600V AC universal input, globally applicable for complex grid conditions
8. User-friendly operation: Removable HMI panel supports door mounting; status reading and parameter adjustment without shutdown
9. Detailed Applications

4.1 Water Treatment & Fluid Handling

Large pump control: Centrifugal / axial / mixed flow pumps in municipal water supply and wastewater treatment plants; soft stop prevents water hammer and reduces pipeline pressure shock

Submersible sewage pumps: Reduces mechanical stress during startup, avoids cavitation and reverse flow impact, improves system reliability

Chemical process pumps: Smooth startup for high-viscosity fluid pumps, minimizes mechanical seal wear and extends service life

4.2 Manufacturing & Material Handling

Compressor systems: Smooth startup for air and refrigeration compressors, reduces grid impact and prevents belt slippage

Crushers / grinders: Heavy-duty crushing equipment in mining and building materials; current-limited startup controls mechanical shock and protects drive systems

Conveyor systems: Long-distance belt conveyors; smooth acceleration avoids material spillage and reduces belt tension stress

Mixers / agitators: Mixers in food and pharmaceutical industries; torque-controlled startup ensures process stability

4.3 Edificio & Infrastrutture

HVAC systems: Large fans (cooling towers, air conditioning units) e pompe; soft starting reduces impact on building power grids

Metro / tunnel ventilation: Synchronous soft starting of multiple high-power fans to avoid interference with lighting and signaling systems

Fire pumps: Main and backup pumps in emergency fire systems; ensures reliable startup in compliance with fire safety codes

4.4 Special Industrial Applications

Pulp & paper: Vacuum / pressure fans for paper machines; smooth startup protects precision drive systems

Oilfield production: Pumping units and water injection pumps; adapts to harsh field environments and improves equipment reliability

Port machinery: Auxiliary motors for cranes and handling equipment; soft starting protects hydraulic systems

5. Cross-Reference for International Brand Equivalents

6. Complete ABB PSTX Series Model List (Standard Order Codes)

The PSTX series is available in various rated currents for different motor powers. Core models are listed below:

7. Selezione & Note applicative
8. Load matching: 300A fits 160kW motors at 400V and 200HP motors at 460V. Consider load type (fan / pump / compressor) and starting conditions during selection
9. Installation notes: Montaggio su guida DIN standard da 35 mm; keep ≥50mm clearance above and below for heat dissipation; vertical installation recommended
10. Communication setup: Modbus RTU supported by default; EtherNet/IP or BACnet can be enabled via parameter settings
11. Protection configuration: Set overload curve, locked rotor protection, phase loss protection, ecc., according to motor parameters to ensure safe operation
12. Replacement selection: Match rated current, voltage range, control voltage and protection functions when replacing; prefer equivalent advanced smart soft starters

Unsuitable Applications

Applications requiring variable frequency speed control (ABB ACS series drives recommended)

Special voltage systems below 100V or above 600V

Outdoor / humid environments requiring IP20 or higher protection (protected version or enclosure required)

Key Differences Between ABB PSTX300-600-70-1 and PSTX300-600-70

1. Official Model Definition & Codici d'ordine

Standard model: PSTX300-600-70, official order code: 1SFA898114R7000

Model with suffix-1: PSTX300-600-70-1, typically corresponds to 1SFA898114R7001 (special configuration version)

2. Differenze fondamentali

3. Detailed Description
4. Control voltage difference: This is the fundamental distinction. The standard version uses 100–240V AC control power, while the-1 version uses 24V DC to suit different control system power supplies
5. Configuration positioning: The “-1” suffix in ABB soft starter naming generally denotes a 24V DC control version, designed for integration with PLC, DCS and other DC control systems, or safety applications requiring electrical isolation between control and main circuits
6. Functional consistency: Except for control voltage, all core functions are identical:

300A rated operational current, suitable for 160kW (400V) / 200HP (460V) motori

3-phase fully controlled thyristor control with integrated bypass contactor (operating power ≤1.5W)

Multiple starting modes: voltage ramp, torque control, current limit

15 motor protection functions: sovraccarico, rotore bloccato, phase loss, phase imbalance, earth fault, ecc.

Removable graphic HMI panel with 15 language support

4. Raccomandazioni per la selezione
5. Control supply matching: Select standard version for AC control systems and-1 version for DC control systems
6. Safety requirements: For safety applications requiring isolation between control and main circuits, the 24V DC-1 version is preferred
7. Spare parts management: Distinguish between the two models to avoid failure due to control voltage mismatch
8. Replacement compatibility: Montaggio identico, communication and protection features; interchangeable with appropriate control power supply (subject to system compatibility check)

The only substantive difference between ABB PSTX300-600-70-1 and PSTX300-600-70 is the control voltage: standard version is 100–240V AC, while the-1 version is 24V DC. All other core parameters, functions and physical dimensions are identical. Selection should be based on control system power type and safety requirements.