ABB 1SAX121001R1105 EF19-18.9 Electronic Overload Relay

1. Product Overview

The ABB 1SAX121001R1105 EF19-18.9 Electronic Overload Relay is an intelligent device designed for protection of low-voltage AC motors. It uses electronic detection to precisely monitor motor current and provides overload, phase-loss, and short-circuit protection. The EF19-18.9 relay can be combined with ABB contactors to provide a complete motor control and protection solution. Its modular design allows easy installation and maintenance, suitable for industrial automation and machinery control systems.

2. Technical Specifications

• Model: 1SAX121001R1105

• Type: Electronic Overload Relay

• Rated Current Range: 1.8–18.9 A (adjustable)

• Rated Operating Voltage: AC 400 V / DC 24–60 V

• Protection Functions: Overload, phase-loss, short-circuit

• Output Contacts: NO/NC relay contacts

• Response Time: Fast response

• Mounting: Can be combined with contactor or DIN rail mount

• Operating Temperature: 0°C to +60°C

• Storage Temperature: -20°C to +70°C

• Protection Rating: IP20

• Indicators: LED status indicators

• Dimensions (W×H×D): ~45 × 80 × 70 mm

• Weight: ~0.2 kg

3. Advantages and Features

• Precise current monitoring: Provides real-time motor monitoring for safe operation.

• Multiple protection functions: Overload, phase-loss, and short-circuit protection prevent motor and equipment damage.

• Adjustable rated current: Flexible setting according to motor specifications.

• LED status indicators: Shows relay operating status and fault information for easy maintenance.

• Modular design: Can be combined with contactors, saving space and simplifying maintenance.

4. Typical Applications

• Industrial motor protection and control

• Conveyor systems, pumps, and fan systems

• Automated production lines and machinery motor protection

• HVAC systems and compressor protection

• Factory automation and smart manufacturing systems

5. Installation & Usage Notes

• Ensure the relay setting matches the motor rated current before installation.

• Secure all wiring to prevent loose connections or short circuits.

• Install in a dry, ventilated environment to prevent dust or liquid ingress.

• Regularly check LED status and relay operation to ensure motor safety.

• Avoid overload operation to prolong relay life.

The structure and details of the product： ​

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