Introduction
This FAQ page explains how the relay output on Mobeye devices works and how it can be used to control external equipment. It covers the internal operation of the relay, how the Mobeye device activates it, and what the connected equipment can expect in terms of switching behaviour and electrical isolation.
Relay Output FAQs
A relay on a Mobeye device is an electrically operated switch mounted on the printed circuit board. It forms its own galvanically isolated circuit, which keeps the switching side electrically separated from the Mobeye device electronics.
Inside the relay, a coil and an electromagnet control a separate switching circuit. When the relay is inactive, the circuit stays in one defined state. When it activates, the circuit changes state — either open or closed.
The Mobeye device applies a voltage to the relay coil — for example, after an alarm event or on an incoming command. The coil generates a magnetic field, moves the internal contact, and switches the circuit from open to closed, or vice versa.
An external device connected to the Mobeye relay detects whether the circuit is open or closed. Based on that state, the external device switches on or off, or changes its operating mode.
No. The Mobeye relay provides a potential-free contact — it switches the circuit only. The external device must have its own power source.
Use a relay output when electrical isolation is required, or when the connected equipment operates at a different voltage or current level. The relay allows the Mobeye device to control external systems without sharing a common electrical ground.
The Mobeye relay output is commonly used to control alarm sirens, access control systems, lighting circuits, and other equipment that requires a simple on/off signal without drawing power from the Mobeye device.
For more detailed technical guidance, refer to our support page or to the Mobeye knowledge base on our company website, where related topics are explained in depth.
