Allen Bradley 20-750-S3 PowerFlex 750 Safe Torque Off Module

The AB 20-750-S3 is a Network Safe Torque Off (STO) option module for PowerFlex 755 AC drives, providing a certified safety interface for disabling motor torque without interrupting power to the drive. Designed to meet advanced machine safety requirements, this module supports safety over EtherNet/IP and other network protocols when installed in a PowerFlex 750-series drive.

As part of the PowerFlex safety options portfolio, the 20-750-S3 enables SIL 3 / PL e safety compliance for emergency stop functions and safe shutdown operations, while minimizing downtime and maintaining communication with control systems. It is ideal for applications requiring integrated safety without the need for external relays or contactors.

Technical Specifications

Model: 20750S3
Series: PowerFlex 750
Type: Safe Torque Off (STO) Option Module
Function: Networked safety disable of motor torque
Compatible Drives: PowerFlex 755
Application: Emergency stop, safety shutdown, maintenance lockout

Electrical Specifications

Power Supply: Supplied via drive backplane
Interface: Network-based safety communication
Isolation: Integrated per safety category requirements
Max Input Voltage (Drive Internal): As per host drive
Rated Safety Function: Safe Torque Off (STO)
Input Type: Safety protocol over network (e.g., CIP Safety)
Power Consumption: Minimal (draws from drive control logic)
Short Circuit Protection: Provided by host drive

Mechanical Specifications

Mounting Type: Plug-in option slot in PowerFlex 755 drive
Form Factor: Internal module
Dimensions: Matches internal slot footprint
Installation Orientation: Follows host drive orientation
Weight: Approx. 100 g
Connector Type: Slot-integrated with drive; no external wiring required
Enclosure Protection: As per host drive (IP20 or higher)

Environmental Specifications

Operating Temperature: 0…50 °C (standard)
Storage Temperature: –40…85 °C
Humidity: 5% to 95% non-condensing
Shock Resistance: 15 g, 11 ms (IEC 60068-2-27)
Vibration Resistance: 1 g, 10–500 Hz (IEC 60068-2-6)
Altitude Rating: Up to 2000 m
Pollution Degree: 2
Certifications: CE, UL, cULus, TÜV
SIL Rating: SIL 3 (IEC 61508)
Performance Level: PL e (EN ISO 13849-1)

Compliance & Communication

Safety Protocol Support: CIP Safety over EtherNet/IP
Network Integration: Via 750-series network adapter
Standard Compliance: IEC 61800-5-2, IEC 61508, EN ISO 13849-1
Drive Integration: Requires PowerFlex 755 with compatible firmware
Diagnostics: Reported through network and drive interface
Reset Mode: Configurable via controller or HMI

Key Features & Benefits

✅ Certified STO Functionality (SIL 3 / PL e) – Delivers safe torque-off without disconnecting drive power

✅ Network-Based Safety Integration – Enables EtherNet/IP and CIP Safety control architectures

✅ Slot-Mounted Plug-In Design – Installs directly into PowerFlex 755 drive for space-saving safety implementation

✅ No Additional Wiring Required – Simplifies installation with internal backplane power and signal interface

✅ Compatible with Studio 5000 – Configure and monitor safety parameters directly from the Rockwell environment

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