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Engineering guide

ST100 Bypass Soft Initiator: VFD Buyer Guide for Pump Motors

This buyer guide explains how the catalog-listed ST100 Bypass Soft Initiator can be evaluated for pump-motor starting tasks, and when the ST200 Online Intelligent Soft Starter Without Bypass or a VFD may be a better catalog fit.

Why the ST100 Bypass Soft Initiator Appears in Pump Buyer Guides

The Boray catalog lists the ST100 Bypass Soft Initiator among soft-starter products, making it a catalog-based option when a pump-motor starting arrangement needs a bypass-type soft initiator. This guide keeps the discussion to catalog names and avoids adding unlisted specifications.

ST100 Bypass Soft Initiator and ST200 Online Intelligent Soft Starter Without Bypass

Both products are catalog-listed soft starters: the ST100 Bypass Soft Initiator carries a bypass reference in its name, while the ST200 Online Intelligent Soft Starter Without Bypass carries an online, without-bypass reference. Buyers can compare these catalog names against the panel layout and starting sequence they need.

When a VFD May Be More Relevant Than a Soft Starter

If the application requires a variable-frequency-drive solution, the Boray catalog includes pump-oriented VFD names such as FS200 Series Intelligent Pump AC Drive, FS300 Series Intelligent Pump AC Drive, BR300-IP54 Smart Water Pump VFD, and SD300 VFD for Outdoor Pumps. A soft starter and a VFD should be selected from different catalog families based on the control need.

Buyer Checklist for High-Inrush Pump Motor Starting

For high-inrush pump motor starting, confirm the product family, catalog name, bypass or online configuration, and whether the motor will be started only or also speed-controlled. Use the catalog-listed ST100 Bypass Soft Initiator or ST200 Online Intelligent Soft Starter Without Bypass as starting points, and request catalog documentation for any unlisted details.

Final Selection Path

Choose the ST100 Bypass Soft Initiator when the catalog bypass soft-initiator family matches the planned starting arrangement. Choose the ST200 Online Intelligent Soft Starter Without Bypass when the catalog online without-bypass family matches. Choose a VFD such as FS200, FS300, BR300, or SD300 when the application is cataloged as a variable-frequency-drive need rather than a soft-starter need.

Apply this to your project

Send the motor ratings, duty and site conditions and Boray will specify the series.

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