General Life MITRA HT300S

MITRA HT300S is a General Life room thermostat. This profile documents the wired version’s published technical data and keeps other manufacturer-listed configurations separate.

Model Identification

Manufacturer: General Life
Series: MITRA
Model: HT300S
Category: Room thermostat

Key Specifications — MITRA HT300S (Wired)

Dimensions (H/L/W)85mm / 125mm / 20mm

Power supply (manufacturer: Operating Current)3V DC (2 x AAA Alkaline Battery)

Relay NO Switching Current2A/30VDC (Resistive Load) 0.5A/125VAC (Resistive Load)

Temperature measurement accuracy (manufacturer-reported)0.1°C

Operating sensitivity (manufacturer-reported)(-2.0°C) – (+2.0°C)

Setpoint range (manufacturer: Operating Temperature Range)(5°C) – (30°C)

Battery Life1 Year (2 x AAA)

Ambient operating temperature(-10°C) – (+50°C)

Storage Temperature(-20°C) – (+60°C)

Specification scope: These values refer to the wired MITRA HT300S only. RF and SMART versions have separate receiver, power and connectivity requirements. The manufacturer’s 0.1°C measurement figure is reproduced as reported; it is not an independently established ±0.1°C accuracy claim. Check the current manual and exact variant before installation.

Manufacturer-Listed Configurations

The official General Life catalog lists this model in wired and wireless (RF) configurations, and also lists a smart configuration. These are distinct variants; installation and electrical specifications must be checked for the exact version.

MITRA series · General Life manufacturer

Official Resources

Source: General Life’s MITRA HT300S wired product specification. Technical data checked on 11 October 2026.

Official MITRA HT300S Wired Product Page

AirAlign is an independent informational resource and is not affiliated with General Life.

Engineering selection — MITRA HT300S

Wall fit and supplied power: MITRA HT300S lists housing dimensions 85mm / 125mm / 20mm; its wider rectangular form should be checked against the actual wall plate and existing wiring route. The thermostat is specified with 3V DC (2 x AAA Alkaline Battery). Do not confuse the wired relay connection with a mains-powered room unit.

Heating input: Its listed normally-open relay load is 2A/30VDC (Resistive Load) 0.5A/125VAC (Resistive Load). Those resistive-load figures do not license direct switching of all boiler voltages or inductive loads. Check the boiler’s thermostat terminals, any low-voltage dry-contact requirement and the wiring diagram before specifying a replacement.

Comfort and cycling: The documented user setpoint span is (5°C) – (30°C) and the operating sensitivity entry is (-2.0°C) – (+2.0°C). A ±2°C-style setting range is not the same as temperature-measurement accuracy; use the manual to resolve hysteresis and configuration. A similarly named RF or SMART suffix is a different integration configuration and must not inherit this wired unit’s relay or power data.

Selection boundary: The dimensions, supply and controller values above come from the recorded exact-model source; feature availability, contact loading and installation approvals still require current maker documentation for the ordered revision.

MITRA HT300S — installation and boiler interface

HT300S is an independently listed MITRA wired on/off controller. Compare its manufacturer casing dimensions and control options with the mounting position and whether the boiler requests a voltage-free contact. The temperature measurement figure, chosen sensitivity and actual heat-call hysteresis describe different behavior. The model-code suffix does not alone establish wireless, OpenTherm or Wi-Fi compatibility; check the exact official documentation.