Chromalox AR-5539 Temperature Control Relay Module

Chromalox AR-5539 Temperature Control Relay Module is a relay-based control accessory designed to switch heating loads in industrial equipment, delivering a load rating of 25 A and a broad temperature setpoint range for demanding process environments. It provides adjustable control from 150 to 550 °F, enabling precise on/off regulation of heating cycles in ovens, furnaces, and other thermal processing equipment, while the unit includes TLI and TLO designations that denote its control/limit signaling features. As a compact, standalone relay module, it is suitable for panel-mounted OEM installations and replacements where a high-current switching device is required to manage a heat source with robust reliability. When selecting this model, users should verify compatibility with their power supply and mounting configuration, as well as the control inputs and interface it is intended to work with, since the AR-5539's defining characteristics are its 25 A rating, the 150–550 °F setpoint window, and the inclusion of the TLI/TLO designations.