The Lm-therm Ted 105-F is a digital temperature regulator purpose-built for thermal management inside electrical enclosures, switch cabinets, and machinery control panels. It directly switches enclosure heaters, cooling fans, or Peltier cooling devices to prevent condensation, frost, and overheating—protecting sensitive electronics without requiring a separate PID controller or PLC integration. The unit replaces conventional electromechanical bulb-and-capillary thermostats with a solid-state digital interface while retaining the same SPDT output topology and wall-mount footprint.

From Electromechanical to Digital — Direct Replacement

• Same SPDT Output, Same Wiring: The Ted 105-F mimics the changeover contact scheme of a conventional thermostat: terminal C (common) connects to NO (normally-open) on temperature rise and to NC (normally-closed) on temperature fall. Existing heating and cooling circuit wiring can be reused without redesigning the control cabinet layout.
• Digital Setpoint Display: Unlike analogue dial-type thermostats that require a screwdriver and a separate thermometer to calibrate, the Ted 105-F shows the current target temperature directly on its digital display. Setpoint adjustment is via front-panel controls—no opening the enclosure door, no guesswork.
• Made for Enclosures: IP 20 protection rating, wall-mounted design, and a compact form factor (compatible with standard enclosure rail spacing) make it a drop-in replacement for legacy Lm-therm mechanical thermostats and equivalent third-party products.

Adjustable Switching Differential — Match Your Cabinet Thermal Inertia

• Configurable Hysteresis (±0.1 to ±2.5 K): The switching differential defines how far the temperature must deviate from the setpoint before the SPDT contact changes state. A narrow differential (±0.1 K) provides tight temperature control for sensitive electronics but increases switching frequency—ideal for small, well-insulated cabinets. A wider differential (±2.5 K) reduces cycling and extends heater/contactor life in larger enclosures with high thermal inertia.
• Energy Optimization: In a typical factory environment, adjusting the differential from ±0.1 K to ±1 K can reduce the heater duty cycle by 30–50% without any noticeable change in internal cabinet temperature, directly lowering auxiliary power consumption over the equipment lifetime.

SPDT Changeover: Heat or Cool with One Device

• Single Device, Dual Function: The SPDT contact allows the Ted 105-F to control both a heating device (connected to the NC terminal—active when temperature falls below setpoint) and a cooling fan or Peltier cooler (connected to the NO terminal—active when temperature rises above setpoint) using a single regulator. No additional relays or logic modules are needed.
• Load Capacity: Rated at 10 A for resistive loads (such as enclosure heaters) and 4 A for inductive loads (such as fan motors or solenoid valves) at 250 V AC. This capacity allows direct switching of most standard control cabinet heaters up to 2300 W without an intermediate contactor.
• Changeover vs. Simple On-Off: Unlike basic 2-wire thermostats that only open or close a single circuit, the changeover mechanism ensures that at least one output (heating or cooling) is active when the temperature is outside the acceptable range—providing continuous protection against both condensation and overheating.

Installation & Configuration

• Wall Mount: The Ted 105-F is fixed directly to the enclosure backplate or side panel using standard fasteners. No DIN rail or bracket adapter is required.
• Wiring: Screw terminals accept solid or stranded conductors. Three terminals (C, NO, NC) serve the SPDT output; two additional terminals supply the controller with 250 V AC operating voltage.
• Setpoint Setup: After mounting and wiring, the user sets the desired temperature via the front-panel interface. The digital display toggles between setpoint and actual temperature readings, and the switching differential is adjusted via a dedicated configuration mode.

Typical Control Cabinet Applications

• Enclosure anti-condensation heating in outdoor or unheated electrical rooms
• Switch cabinet ventilation control to remove excess heat from VFDs and transformers
• Peltier cooler activation on equipment doors for spot cooling of sensitive electronics
• Control panel thermal management in food & beverage, wastewater treatment, and chemical plants