abb softstarter PSTX840-690-70 pstx (690v) range 840 amp

Why Choose the ABB PSTX840-690-70 Softstarter?

The ABB PSTX840-690-70 is a high-performance industrial softstarter engineered to provide smooth motor starting, stopping and advanced protection for large three-phase AC motors in demanding industrial environments. As part of the intelligent ABB PSTX softstarter series, this model combines advanced motor control, integrated bypass functionality and extensive diagnostics within a robust and energy-efficient platform.

Designed for industrial automation and heavy-duty process applications, the PSTX840-690-70 reduces electrical inrush current while minimising mechanical stress on motors and driven equipment. Its intelligent torque control and advanced protection functions improve operational reliability while extending the service life of pumps, compressors, conveyors and heavy industrial machinery.

With a rated operational current of 840 A and support for 208–690 V AC three-phase systems, this ABB softstarter is ideal for very large industrial motors and critical heavy-duty applications. The detachable full graphic keypad, integrated Modbus RTU communication and support for optional Anybus fieldbus modules simplify commissioning, diagnostics and operational monitoring in modern industrial automation systems.

Key Advantages

• Advanced soft starting and stopping control for industrial motors.
• 840 A operational current suitable for heavy-duty industrial applications.
• 208–690 V AC three-phase compatibility.
• Integrated built-in bypass improves efficiency and reduces heat losses.
• Comprehensive built-in motor protection and diagnostics.
• Integrated Modbus RTU with optional industrial communication support.
• Robust panel-mounted design for industrial automation systems.

Key Features

• ABB PSTX advanced softstarter series.
• 840 A rated operational current.
• 208–690 V AC operating voltage range.
• Integrated electronic overload protection.
• Built-in bypass for reduced energy consumption.
• Voltage ramp and torque ramp starting methods.
• Detachable IP66 / Type 4X graphic keypad.
• Integrated Modbus RTU communication interface.
• Support for Profinet, Profibus, Ethernet/IP, Modbus TCP and other protocols.
• Functions including kickstart, braking, sequence start, motor heating and pump cleaning.

Technical Specifications

• Manufacturer: ABB
• Series: PSTX Softstarters
• Model: PSTX840-690-70
• Product ID: 1SFA898219R7000
• Product type: Softstarter
• Rated operational current: 840 A
• Operational voltage: 208–690 V AC
• Control supply voltage: 100–250 V AC
• Control circuit voltage: 24 V DC
• Frequency: 50 / 60 Hz
• Inline motor power at 400 V: 450 kW
• Inline motor power at 500 V: 560 kW
• Inline motor power at 690 V: 710 kW
• Inside delta motor power at 400 V: 710 kW
• Inside delta operational current: 1455 A
• Protection rating: IP00
• Mounting type: Panel mounting
• Dimensions (H × W × D): approx. 593 × 390 × 327 mm
• Weight: approx. 39 kg

Advanced Motor Starting for Industrial Applications

The ABB PSTX series uses intelligent voltage and torque regulation to provide smooth motor acceleration and deceleration while reducing inrush current and mechanical stress. This improves operational reliability, minimises maintenance requirements and extends the service life of motors and driven systems.

The PSTX840-690-70 includes advanced protection and monitoring features such as overload protection, current limiting, braking, motor heating, diagnostics and emergency mode. Integrated communication capabilities allow seamless integration into PLC, SCADA and industrial automation systems for improved monitoring and process control.

Typical Applications

• Industrial pumps and water treatment systems.
• Compressors and process equipment.
• Conveyor systems and material handling.
• Industrial fans and ventilation systems.
• Mining and heavy industrial applications.
• General industrial motor control applications.

Trusted by Industrial Engineers Worldwide

ABB PSTX softstarters are trusted globally by industrial engineers and automation specialists for delivering advanced motor control, dependable operation and reduced maintenance in demanding industrial applications.