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Relay protection with built-in battery

Relays with built-in batteries provide continuous protection and control even during mains power failure, ensuring reliable operation in critical systems.Overview

A relay with a built-in battery combines the functionality of a protective relay with an integrated energy source, allowing it to operate independently of the main power supply. These devices are designed to maintain protection, signaling, and control functions during power outages, which is essential in industrial, utility, and safety-critical applications .

How It Works
  • Battery Backup: The built-in battery, often a tamper-proof lithium cell, provides power for the relay to continue functioning when mains power is lost. Some modules, like the Ei128RBU, can operate for up to two months without mains power .
  • Relay Operation: The relay receives a control signal from a connected system (e.g., alarms, sensors, or protection circuits) and switches its contacts to control external devices. It can provide pulse outputs or continuous outputs depending on the application .
  • Self-Powered Relays: Advanced protection relays, such as Fanox SIL-C, are self-powered and can measure voltage and current directly from the line, providing overcurrent, earth fault, and frequency protection without relying on external power .
Applications
  • Industrial and Utility Systems: Protect feeders, motors, and distribution lines in medium- and low-voltage grids .
  • Alarm and Safety Systems: Interface with smoke, heat, or nurse call alarms to trigger signals or control devices during power loss .
  • Off-Grid or Mobile Systems: Maintain DC power management in vehicles, boats, or off-grid setups using battery combiners and disconnect switches .
Advantages
  • Uninterrupted Protection: Ensures critical systems remain operational during power outages.
  • Enhanced Safety: Reduces the risk of system failure or downtime in industrial and safety-critical environments.
  • Versatility: Can be configured for different outputs, voltages, and load types.
  • Longevity: Built-in batteries are often designed to last the lifetime of the relay module, minimizing maintenance .
Examples of Products
  • Ei128RBU Relay Module: 230V AC mains operation with built-in lithium cells, compatible with multiple alarm systems, capable of pulse or continuous output .
  • Fanox SIL-C Self-Powered Relay: Provides overcurrent and earth fault protection with direct line measurement, suitable for industrial switchgear .
  • Battery Relays for DC Systems: High-current relays and solenoids for vehicles, boats, and off-grid systems, often including smart timers and automatic battery combiners . Relays with built-in batteries are essential for ensuring reliable protection and control in environments where power interruptions could compromise safety or operational continuity. They are widely used in industrial automation, utility grids, and emergency systems.
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