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End-of-Line Resistor
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What is End-of-Line Resistor?

An End-of-Line (EOL) resistor is a small electrical component used in alarm and security systems to monitor the integrity of wiring between sensors and the control panel. It is installed at the end of a circuit, usually inside the final device, to ensure the system can detect faults such as tampering, short circuits, or cable cuts. The resistor creates a constant electrical value that the panel continuously checks.


If someone tries to tamper with the sensor or damage the wiring, the resistance value changes, and the control panel triggers the trouble. EOL resistors help maintain system accuracy and reduce false alarms for a reliable security system. They are essential for different types of security and safety systems like intrusion detection, fire alarms, and access control systems to ensure continuous supervision and safer operation.

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