Temperature regulator Ospel RTM-03 single-module, adjustable -10 to 90°C, hysteresis 0.25–2°C

The Ospel RTM-03 single-module temperature regulator is designed to monitor and switch heating or cooling circuits with an adjustable measurement range from -10 to 90°C. The device provides temperature-based switching outputs and configurable hysteresis between 0.25 and 2°C, allowing precise control of on/off cycles. The compact single-module format fits DIN-rail installations in residential distribution boards and light-commercial control panels where reliable temperature regulation is required.

Advantages

The regulator offers a wide measurement range and fine hysteresis adjustment for adaptable temperature control. Its single-module design saves space in distribution enclosures and enables straightforward integration with boilers, circulation pumps and ventilation systems. The clear switching function supports both heating and cooling applications, while the configurable hysteresis reduces short-cycling and stabilizes system operation.

Suitable for

• Control of residential or small commercial boilers and heating circuits
• Activation of circulation pumps based on temperature thresholds
• Ventilation control where temperature-based switching is required
• Temperature protection for equipment and local installations

Key specifications

• Measurement range: -10 to 90°C
• Hysteresis: adjustable from 0.25 to 2°C
• Form factor: single-module for DIN-rail mounting
• Output: temperature-based switching contacts for control of heating/cooling circuits
• Application: suitable for thermostatic control, pump switching and temperature protection

How to use

Install the single-module regulator on a standard DIN rail inside the electrical distribution board, following local wiring regulations. Connect the temperature sensor and load circuits according to the system schematic, ensuring correct polarity and secure terminal connections. Set the desired temperature setpoint within the -10 to 90°C range and adjust the hysteresis to between 0.25 and 2°C to achieve the required switching sensitivity. Verify operation by observing the switching behavior at the chosen setpoint and refining hysteresis to prevent unnecessary cycling.

Usage recommendations

For reliable long-term operation, use a properly rated temperature sensor and ensure the regulator is installed in a dry, ventilated enclosure away from direct heat sources. Select hysteresis settings that balance responsiveness and equipment protection to minimize relay wear and pump short-cycling.