Output Relay Module

The Output Relay Module is a critical component of a Temperature Control Panel responsible for executing control commands. It receives low-voltage signals from the panel's controller or processor and uses electromagnetic relays to switch higher-power circuits that control external devices such as heaters, fans, compressors, pumps, or alarm indicators. This isolation between the sensitive control circuitry and the high-power load circuits protects the control system and enables safe operation of industrial equipment.

The module operates on an electromagnetic principle. When the temperature controller sends a digital ON signal (typically 5V, 12V, or 24V DC) to the module's input terminal, it energizes an electromagnet coil inside a relay. This creates a magnetic field that pulls a mechanical armature, closing a set of physical contacts (the switch). This closure completes a separate, higher-voltage/higher-current circuit (e.g., 120VAC, 240VAC) connected to the relay's output terminals, thereby powering the connected load (like a heating element). When the control signal turns OFF, the coil de-energizes, a spring returns the armature, and the contacts open, breaking the load circuit.