Schneider Electric offers a range of Electronic Overcurrent Relays (EOCR) designed to provide advanced protection for motors and other electrical equipment. These relays are part of their comprehensive line of protective devices, ensuring safety and reliability in various industrial and commercial applications.

Key Features of Schneider Electric EOCR Overcurrent Relays

1. Overcurrent Protection:
   • Detects overcurrent conditions and trips the circuit to protect equipment from damage.
   • Adjustable settings for precise overcurrent protection.
2. Advanced Protection Functions:
   • In addition to overcurrent, EOCR relays often include protection for phase loss, phase unbalance, ground fault, and short circuit.
   • Comprehensive protection enhances the safety and longevity of electrical systems.
3. Current Sensing:
   • Uses current transformers (CTs) for accurate monitoring of current flow.
   • High accuracy and reliability in detecting overcurrent conditions.
4. Adjustable Trip Settings:
   • Allows customization of trip current and time delay settings.
   • Provides flexibility to meet specific protection requirements for different applications.
5. LED Indicators and Digital Displays:
   • LED indicators provide visual status of power, trip, and fault conditions.
   • Some models feature digital displays for easy setting and monitoring of parameters.
6. Compact and Easy Installation:
   • Designed for easy integration into control panels with a compact form factor.
   • Supports DIN rail mounting for convenient installation.
7. Relay Outputs:
   • Equipped with relay contacts for tripping the circuit breaker or contactor.
   • Ensures reliable operation and control of the protected circuit.

Example Applications

• Motor Protection: Safeguards motors from overcurrent, phase loss, and other electrical faults, preventing overheating and damage.
• Industrial Machinery: Protects various types of industrial equipment from electrical faults, ensuring safe and reliable operation.
• Power Distribution Systems: Ensures protection for transformers, distribution panels, and other critical components in power distribution networks.
• HVAC Systems: Provides protection for compressors, fans, and other components in heating, ventilation, and air conditioning systems.

Selecting the Right EOCR Relay

When selecting an EOCR relay from Schneider Electric, consider the following:

• Current Rating: Choose a relay that matches the current rating of the equipment to be protected.
• Protection Features: Determine the necessary protection features (e.g., overcurrent, phase loss, ground fault) for your specific application.
• Adjustable Settings: Ensure the relay allows for appropriate adjustment of trip settings and time delays.
• Supply Voltage Compatibility: Verify that the relay is compatible with the supply voltage in your system.
• Relay Outputs: Check the type and number of relay contacts needed for controlling the circuit breaker or contactor.

Example Product: Schneider Electric EOCR-SS Series

The EOCR-SS series is a popular line of Schneider Electric’s overcurrent relays, known for their reliability and advanced protection features. Here are some key specifications:

• Current Range: 0.5 to 60A (model-dependent)
• Protection Functions: Overcurrent, phase loss, phase unbalance, ground fault
• Adjustable Settings: Trip current and time delay settings are customizable
• Indicators: LED status indicators for power, trip, and fault conditions
• Mounting: Designed for DIN rail mounting

Installation and Usage

1. Mounting: Install the EOCR relay on a DIN rail in the control panel.
2. Wiring: Follow the provided wiring diagram to connect the relay to current transformers and the control circuit.
3. Setting Parameters: Use the front-panel dials or digital interface to set the desired trip current and time delay.
4. Testing: Perform testing to ensure the relay operates correctly and provides the necessary protection.

For detailed technical specifications, installation guides, and operational instructions, refer to the datasheets and user manuals provided by Schneider Electric for the specific EOCR model you are using. This ensures correct installation and optimal performance of the protective relay in your application.