20-750-S3 | Allen-Bradley integrated safety module, STO, for PowerFlex 755/755T drives
20-750-S3 | Allen-Bradley integrated safety module, STO, for PowerFlex 755/755T drives
20-750-S3 | Allen-Bradley integrated safety module, STO, for PowerFlex 755/755T drives
    20-750-S3 | Allen-Bradley integrated safety module, STO, for PowerFlex 755/755T drives
20-750-S3 | Allen-Bradley integrated safety module, STO, for PowerFlex 755/755T drives

20-750-S3 | Allen-Bradley integrated safety module, STO, for PowerFlex 755/755T drives

Part #: 20-750-S3 Manufactured by: Allen-Bradley
$599.00
$599.00
8 in Stock
Condition: New – Open box
Shipping calculated at checkout.
Product Overview
Allen Bradley 20-750-S3 Network Safe Torque Off (STO) Option Module for PowerFlex 750 Series AC Drives, Provides Either a ...  Read more
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Product Description P/N: 20-750-S3

Description / Specifications

Description 

The Allen-Bradley 20-750-S3 is an integrated safety module designed for PowerFlex 755 and 755T drives. This part number supports Safe Torque Off (STO) functionality through both hardwired and networked safety configurations. Operating on 24 VDC inputs, it provides a reliable means of preventing unintended motor operation in industrial applications.

 

 

Technical Specifications 

Condition New/Never Used Surplus
Brand Allen-Bradley
Category Safety Module
Part Number 20-750-S3
Subcategory Drive Safety Accessories
Series PowerFlex 755
Compatibility PowerFlex 755 / 755T drives
Safety Feature Safe Torque Off (STO)
Hardwired STO Yes
Networked STO Yes
Input Voltage 24 VDC
Input Type Current sinking
On-State Voltage 11–30 VDC
Minimum On-State Current 3.3 mA
On-State Current 3.5 mA (typical)
Maximum Off-State Voltage 5 VDC
Maximum Off-State Current 1.5 mA
Recommended Conductor Size 28–18 AWG
Environmental Protection Requires IP54 enclosure or controlled environment
Certifications UL, CE, C-Tick, TÜV

 

Information About 20-750-S3

The 20-750-S3 belongs to the PowerFlex 755 safety accessory family and is engineered to provide STO capability directly within the drive system. It enables both hardwired and Ethernet-based STO commands, allowing integration with safety controllers for advanced machine safeguarding. The module uses current-sinking 24 VDC inputs and supports compliant safety operation when installed in an appropriately protected enclosure. Typical applications include machinery requiring controlled shutdown of motor torque during maintenance, service, or safety-related events without removing input power to the drive.

Key Features:

  • Safe Torque Off (STO): Prevents unintended motor torque output without removing power from the drive.
  • Dual STO Options: Supports both hardwired and networked STO activation.
  • PowerFlex 755/755T Compatibility: Integrates directly with designated drive platforms.
  • 24 VDC Input Supply: Requires PELV/SELV-rated safety power.
  • Current-Sinking Inputs: Provides consistent signal detection for safety circuits.
  • Wide On-State Voltage Range: Operates from 11–30 VDC with stable current thresholds.
  • Certified Safety Compliance: UL, CE, C-Tick, and TÜV approvals support global use.

The 20-750-S3 delivers the reliability and precision required for high-integrity safety control in modern drive systems.

Frequently Asked Questions about 20-750-S3
Question: What is the 20-750-S3?
Date Update:17/06/2025
Answer:

The Allen-Bradley 20-750-S3 is an integrated safety module designed to enhance the safety functions of PowerFlex 755 and 755T series drives. It provides Safe Torque Off (STO), a critical safety function that ensures the motor does not generate torque, effectively preventing unintended operation during maintenance or emergency stops. This module is especially valuable in applications where operators need to safely work on mechanical systems without the risk of motor activation. It can be integrated into both hardwired and networked safety systems, making it a flexible component in modern industrial automation architectures.

Question: How does the Safe Torque Off function work?
Date Update:17/06/2025
Answer:

The STO function in the 20-750-S3 module is designed to immediately stop the drive from delivering torque to the motor, but without removing power from the drive itself. This is particularly useful during mechanical servicing, where electrical continuity is maintained but motor movement is prevented. STO can be activated through hardwired connections or through a networked signal issued by a safety controller over Ethernet.

Question: How do you connect the 20-750-S3 module?
Date Update:17/06/2025
Answer:
  • Connect a 24V DC power source rated for PELV or SELV to the input terminals
  • Use current-sinking input signals for STO control
  • Configure the system to receive STO commands via Ethernet for networked STO
  • Ensure wiring uses 28 to 18 AWG conductors
  • Verify that both hardwired and networked connections meet your safety system's requirements

Proper connection is critical for safety compliance and functional integrity.

Question: What are the electrical input specifications?
Date Update:17/06/2025
Answer:
  • Input voltage: 24V DC (PELV or SELV compliant)
  • On-state voltage range: 11–30V
  • On-state current: 3.5 mA
  • Off-state maximum current: 1.5 mA
  • Off-state maximum voltage: 5V DC
  • Input type: Current-sinking digital inputs

These values should be carefully matched during system design and setup.

Question: Is the 20-750-S3 suitable for all PowerFlex drives?
Date Update:17/06/2025
Answer:

The 20-750-S3 is specifically designed for compatibility with Allen-Bradley's PowerFlex 755 and 755T drive series. It is not intended for use with other PowerFlex drive families like the 70, 700, or 523/525 series. This ensures that the module is optimized for the STO features of these higher-end drive platforms. When designing or upgrading a drive system, it is crucial to match the safety module with the correct drive series to ensure full functionality and compliance with safety standards.

IQElectro is not an authorized distributor.
IQElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses For more detailed information, please refer to the full version of our disclaimer policy Disclaimer Policy.
Description / Specifications

Description 

The Allen-Bradley 20-750-S3 is an integrated safety module designed for PowerFlex 755 and 755T drives. This part number supports Safe Torque Off (STO) functionality through both hardwired and networked safety configurations. Operating on 24 VDC inputs, it provides a reliable means of preventing unintended motor operation in industrial applications.

 

 

Technical Specifications 

Condition New/Never Used Surplus
Brand Allen-Bradley
Category Safety Module
Part Number 20-750-S3
Subcategory Drive Safety Accessories
Series PowerFlex 755
Compatibility PowerFlex 755 / 755T drives
Safety Feature Safe Torque Off (STO)
Hardwired STO Yes
Networked STO Yes
Input Voltage 24 VDC
Input Type Current sinking
On-State Voltage 11–30 VDC
Minimum On-State Current 3.3 mA
On-State Current 3.5 mA (typical)
Maximum Off-State Voltage 5 VDC
Maximum Off-State Current 1.5 mA
Recommended Conductor Size 28–18 AWG
Environmental Protection Requires IP54 enclosure or controlled environment
Certifications UL, CE, C-Tick, TÜV

 

Information About 20-750-S3

The 20-750-S3 belongs to the PowerFlex 755 safety accessory family and is engineered to provide STO capability directly within the drive system. It enables both hardwired and Ethernet-based STO commands, allowing integration with safety controllers for advanced machine safeguarding. The module uses current-sinking 24 VDC inputs and supports compliant safety operation when installed in an appropriately protected enclosure. Typical applications include machinery requiring controlled shutdown of motor torque during maintenance, service, or safety-related events without removing input power to the drive.

Key Features:

  • Safe Torque Off (STO): Prevents unintended motor torque output without removing power from the drive.
  • Dual STO Options: Supports both hardwired and networked STO activation.
  • PowerFlex 755/755T Compatibility: Integrates directly with designated drive platforms.
  • 24 VDC Input Supply: Requires PELV/SELV-rated safety power.
  • Current-Sinking Inputs: Provides consistent signal detection for safety circuits.
  • Wide On-State Voltage Range: Operates from 11–30 VDC with stable current thresholds.
  • Certified Safety Compliance: UL, CE, C-Tick, and TÜV approvals support global use.

The 20-750-S3 delivers the reliability and precision required for high-integrity safety control in modern drive systems.

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