Introduction

The ABB PST300-600-70 (1SFA894014R7000) is an industrial soft starter developed for controlling high-power three-phase asynchronous motors. As part of ABB's PST soft starter range, it combines controlled motor starting and stopping with integrated protection functions to support reliable operation in demanding industrial environments.

With a 300 A in-line rated operational current and a main circuit voltage range of 208–600 V AC, the PST300-600-70 is suitable for motor-driven equipment used in heavy industry, water treatment, mining, manufacturing, and large ventilation systems.

During conventional direct-on-line starting, motors can draw high inrush current and generate sudden mechanical torque. The PST300-600-70 helps manage this process by gradually increasing motor voltage, reducing starting stress on electrical and mechanical components. Its adjustable operating parameters also provide flexibility when configuring the starter for different motor loads.

For industrial equipment manufacturers, system integrators, and maintenance professionals, the PST300-600-70 offers a practical motor-control solution that combines high-current capability, adjustable starting performance, and integrated protection.

Technical Specifications

Parameter	Specification
Brand	ABB
Model	PST300-600-70
Order Number	1SFA894014R7000
Product Type	Soft Starter
Product Series	PST
Main Circuit Voltage	208–600 V AC
Control Supply Voltage	100–250 V AC
Control Circuit Voltage	24 V DC
Rated Operational Current (In-Line)	300 A
Rated Frequency	50/60 Hz
Motor Type	Three-Phase Asynchronous Motor
Connection Type	In-Line / Inside Delta
Motor Protection	Integrated Electronic Overload Protection
Starting Function	Adjustable Soft Starting
Stopping Function	Controlled Soft Stopping
Dimensions	420 × 270 × 360 mm
Weight	23 kg / 50.71 lb

Recommended Related Models

The following ABB PST soft starters belong to the same product family and offer different current ratings for various motor-control requirements.

Model	Order Number	Product Type
PST250-600-70	1SFA894013R7000	Soft Starter
PST210-600-70	1SFA894012R7000	Soft Starter
PST175-600-70	1SFA894011R7000	Soft Starter
PST142-600-70	1SFA894010R7000	Soft Starter
PST105-600-70	1SFA894009R7000	Soft Starter

Popular Related Models

Other ABB PST soft starters that may be relevant to industrial motor-control projects include:

ABB PST30-600-70 Soft Starter
ABB PST37-600-70 Soft Starter
ABB PST44-600-70 Soft Starter
ABB PST50-600-70 Soft Starter
ABB PST60-600-70 Soft Starter
ABB PST72-600-70 Soft Starter
ABB PST85-600-70 Soft Starter
ABB PSTB370-600-70 Soft Starter

Applications

The ABB PST300-600-70 1SFA894014R7000 Soft Starter is designed for controlling the starting and stopping of high-power three-phase asynchronous motors in demanding industrial environments. It provides controlled motor acceleration and deceleration, helping reduce high starting current, mechanical shock, and stress on connected equipment.

With its high-current motor-control capability, the PST300-600-70 is suitable for applications where reliable starting performance and effective motor protection are essential.

Typical applications include:

Water and wastewater treatment: Controls large pump motors and helps reduce pressure fluctuations during startup and stopping.
Mining and mineral processing: Supports motor-driven conveyors, crushers, and auxiliary equipment.
Industrial compressors: Helps reduce mechanical stress during motor acceleration.
Ventilation systems: Provides controlled starting for large industrial fans and blowers.
Manufacturing facilities: Supports motor-driven production machinery and processing equipment.
Material handling: Helps achieve smoother startup of conveyor systems and other heavy-duty loads.

Advantages and Key Features

1. Smooth Motor Starting

The PST300-600-70 gradually increases the voltage supplied to the motor during startup. This helps limit starting current and reduces sudden torque changes that can affect mechanical equipment.

2. High-Current Motor Control

With a 300 A rated operational current for in-line connection, this model is suitable for larger industrial motor applications requiring controlled starting performance.

3. Flexible Connection Options

The PST series supports in-line and inside-delta motor connection configurations. This flexibility allows engineers to select an appropriate installation arrangement according to the motor and system design.

4. Integrated Electronic Motor Protection

Built-in electronic overload protection helps monitor motor operating conditions and protect connected equipment against sustained overloads.

5. Adjustable Motor-Starting Parameters

Configurable starting and stopping functions allow users to adapt motor acceleration and deceleration to different load characteristics and operational requirements.

6. Flexible Control Supply

The 100–250 V AC control supply range supports integration into different industrial control systems. The unit also supports a 24 V DC control circuit.

7. Improved System Integration

By combining motor-starting control and protection functions in one device, the PST300-600-70 can help simplify motor-control cabinet design and reduce the need for additional starting components.

Technical FAQs

Q1: What is the rated operational current of the ABB PST300-600-70?

The PST300-600-70 has a rated operational current of 300 A for in-line connection. The applicable inside-delta rating depends on the manufacturer's specified connection and operating conditions.

Q2: What main circuit voltage does this soft starter support?

The PST300-600-70 is designed for three-phase motor applications with a main circuit voltage range of 208–600 V AC.

Q3: What control supply voltage is required?

The control supply voltage range is 100–250 V AC at 50/60 Hz.

Q4: Does the PST300-600-70 support 24 V DC control?

Yes. The unit supports a 24 V DC control circuit for compatible industrial control arrangements.

Q5: Can this soft starter be used with inside-delta motor wiring?

Yes. The PST series supports both in-line and inside-delta connections. The motor wiring, current settings, and installation procedure must follow the applicable technical instructions.

Q6: What type of motor is compatible with the PST300-600-70?

It is designed for three-phase asynchronous motors. Before installation, verify that the motor's rated voltage, current, power, and starting characteristics are compatible with the soft starter.

Q7: Does this model include motor overload protection?

Yes. It features integrated electronic overload protection. Correct motor-current and protection settings are important for reliable operation.

Q8: How does the PST300-600-70 help reduce starting current?

It controls the voltage supplied to the motor during acceleration instead of applying full voltage immediately. This helps reduce the electrical demand associated with direct-on-line starting.

Q9: What should be checked if the motor does not respond to a start command?

Inspect the incoming power supply, control supply, start signal, motor wiring, external interlocks, protection status, and parameter settings. Check for active fault indications before restarting the equipment.

Q10: What can cause a soft starter to trip during motor operation?

Possible causes include motor overload, phase loss, abnormal supply voltage, incorrect motor-current settings, excessive starting time, or unsuitable application sizing. The fault indication and operating conditions should be checked to identify the actual cause.

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