Description
Detailed Parameter Table
| Parameter Name | Parameter Value |
| Product Model | ABB 07AC91 |
| Manufacturer | ABB |
| Product Category | Motor Protection Relay |
| Rated Voltage | 24-240V AC/DC |
| Current Range | 0.5-100A (adjustable) |
| Protection Functions | Thermal Overload, Phase Loss, Ground Fault, Locked Rotor |
| Control Outputs | 4x Relay, 1x Analog (4-20mA) |
| Communication | Modbus RTU (RS485), PROFIBUS DP (optional) |
| Display | Graphical LCD with Backlight |
| Operating Temperature | -20°C to +60°C |
| Protection Rating | IP54 (front panel) |
| Dimensions | 96x96x95 mm (panel-mounted) |
| Certifications | CE, UL, IEC 60947 |
ABB 07AC91
Product Introduction
The ABB 07AC91 is an advanced motor protection relay designed for comprehensive monitoring and protection of three-phase motors in industrial applications. Part of ABB’s renowned motor protection portfolio, this intelligent device combines precise measurement capabilities with adaptive protection algorithms to ensure optimal motor performance and longevity.
Featuring a graphical LCD interface and multiple communication options, the 07AC91 provides real-time monitoring of motor parameters while offering reliable protection against electrical and mechanical faults. Its compact design and easy configuration make it suitable for both standalone applications and integration into larger automation systems across various industries including manufacturing, oil & gas, and water treatment.
Core Advantages and Technical Highlights
Comprehensive protection features:
The ABB 07AC91 offers complete motor protection with thermal overload (49) and locked rotor (51LR) protection, plus phase loss/unbalance (46) and ground fault (50G/51G) detection. Its adjustable trip class (5-30) allows customization for specific motor characteristics and applications.
Advanced monitoring capabilities:
With true RMS current measurement (0.5-100A range) and energy monitoring, the relay provides valuable operational data. The integrated motor run-time counter enables predictive maintenance scheduling, while temperature monitoring (with optional PT100 input) offers additional protection.
User-friendly operation:
The graphical LCD display with intuitive menu navigation simplifies configuration and diagnostics. Multilingual support and quick setup wizards reduce commissioning time, while the front USB port facilitates easy parameter transfer and firmware updates.
Robust industrial design:
Built for harsh environments, the 07AC91 features an IP54 front panel and operates reliably in -20°C to +60°C temperatures. Its vibration-resistant construction (2g @ 10-150Hz) ensures stable operation in demanding industrial settings.
Flexible integration:
The relay supports Modbus RTU and optional PROFIBUS DP communication for seamless integration with PLCs and SCADA systems. The 4-20mA analog output provides process variable transmission, while four programmable relay outputs offer flexible control options.
Typical Application Scenarios
Industrial pumps and fans:
The ABB 07AC91 protects critical pumping systems in water treatment plants and HVAC applications, preventing damage from overload conditions while optimizing energy consumption through continuous monitoring.
Conveyor systems:
In material handling applications, the relay safeguards motors against locked rotor conditions and phase imbalances, while providing early warning of mechanical issues through trend analysis.
Compressors and mixers:
The 07AC91 ensures reliable operation of heavy-duty rotating equipment in chemical processing, with customized protection curves matching specific motor characteristics.
Manufacturing equipment:
Integrated into machine safety systems, the relay provides comprehensive motor diagnostics for predictive maintenance in automotive production lines and other manufacturing processes.
Mining operations:
The robust design of the ABB 07AC91 makes it ideal for protecting motors in harsh mining environments, where dust, vibration, and temperature extremes are common challenges.
ABB 07AC91
Related Model Recommendations
ABB 07KT97: Higher current range motor protection relay
ABB MS116: Compact motor starter with integrated protection
ABB EMAX2: Circuit breaker with motor protection features
ABB ACS880: Drive with built-in motor protection
ABB CM-MPS: Modular motor protection system
ABB CP600: HMI for motor monitoring and control
ABB SAFE 615: Safety relay for motor applications
Installation and Commissioning
Installation preparation:
Mount the ABB 07AC91 on a standard 96x96mm panel cutout, ensuring proper clearance for heat dissipation. Verify current transformer specifications match motor ratings, and use shielded cables for signal connections to minimize EMI.
Commissioning steps:
Configure motor nameplate data (FLC, service factor)
Set protection parameters according to application requirements
Program relay outputs for desired control functions
Establish communication settings (if used)
Verify all protection functions through simulation tests
Maintenance recommendations:
Regularly verify protection settings during routine maintenance. Monitor motor operating hours and trending data for predictive maintenance. Keep firmware updated to the latest version, and clean the display surface using approved cleaning agents.
Service and Guarantee Commitment
ABB provides a 3-year warranty for the 07AC91, covering manufacturing defects and component failures. Our global technical support network offers comprehensive assistance, including:
24/7 troubleshooting support
Firmware updates and security patches
On-site service options for critical applications
Training programs for proper installation and operation
The ABB 07AC91 is backed by ABB’s commitment to quality and reliability, with long-term product availability and comprehensive documentation including installation guides, application manuals, and certification files. Our experienced automation specialists are available worldwide to ensure optimal performance throughout the product lifecycle.
