Merten Room Temperature Controller Module, Anthracite MEG5779-0414

This mechanical room temperature controller module from Merten offers a straightforward, reliable way to regulate heating or cooling in flush-mounted installations. Unlike electronic controllers that require programming, the bimetal-based switching responds directly to ambient temperature changes, making it ideal for users who prefer simple, maintenance-free operation. The anthracite finish integrates cleanly with Merten System M and System Design frames, providing a consistent look across your switch range.

Highlights

• Mechanical bimetal control principle for dependable, drift-free switching
• Adjustable temperature range from +5 °C to +30 °C with approximately 0.5 K differential
• 1-pole changeover contact (SPDT) supports both heating and cooling modes via wiring
• Rated for 10 A resistive loads (4 A inductive at cos φ = 0.6) at 230 V AC
• Flush-mounted design fits standard flush boxes; screw terminals accept up to 2.5 mm² cables

In daily use

The module is designed to be paired with a compatible cover plate and frame from the Merten System M or System Design ranges. Once installed, the rotary knob allows direct temperature adjustment without the need for tools or digital menus. The integrated NTC sensor ensures stable and accurate room temperature measurement, while the changeover contact gives flexibility for either heating or cooling applications. The halogen-free thermoplastic housing contributes to a durable, low-maintenance installation.

Full specifications

• Product type: Room temperature controller module
• Control principle: Mechanical (bimetal)
• Mounting type: Flush-mounted
• Colour: Anthracite
• Operating voltage: 230 V AC, 50/60 Hz
• Switching current (resistive): 10 A
• Switching current (inductive): 4 A (cos φ = 0.6)
• Contact type: 1-pole changeover (SPDT)
• Adjustable temperature range: +5 °C to +30 °C
• Switching differential: approx. 0.5 K
• Temperature sensor: Integrated NTC
• Operating mode: Heating or cooling (selectable via wiring)
• Protection rating: IP20
• Material: Thermoplastic (PC, halogen-free)
• Terminal type: Screw terminals
• Max. cable cross-section: 2.5 mm²
• Compatibility: Merten System M / System Design switch ranges (requires cover and frame)

Final note

This module is the core temperature regulation component; a compatible cover plate and frame are required to complete the installation.