Siemens Building Technology Line Voltage Thermostats

Siemens Building Technology Line Voltage Thermostats

Siemens Building Technology brings the precision engineering and reliability of a global leader to one of the most fundamental elements of HVAC control: the line voltage thermostat. As an operating division of Siemens AG, Siemens Building Technology has spent decades developing automation and control products for commercial, industrial, and public buildings worldwide — and their line voltage thermostats reflect that same commitment to durability and performance.

The 134 Series: Built for Real-World Installations

The flagship 134 Series Electric Line Voltage Room Thermostat is an on/off line voltage room thermostat engineered for both heating and cooling applications, with models available in SPST or SPDT contact action configurations. This flexibility makes the 134 Series a go-to choice for HVAC professionals who need a single product line that can adapt to a range of jobsite requirements.

Models are available for standard-duty (nominal 1/4 hp / 10 amps non-inductive) or heavy-duty (nominal 1 hp / 22 amps non-inductive) applications, meaning these thermostats can handle everything from light office HVAC loads to the demanding electrical requirements of industrial facilities.

Key Features That Set Siemens Apart

The 134 Series controls heating and cooling applications or year-round air conditioning units in commercial, industrial, or residential installations, making it one of the more versatile line voltage offerings on the market. Several features stand out for professional installers:

• The 120/240 VAC unit is SPDT with exposed or concealed single setpoint adjustment and a bimetal thermometer, high and low limit stops, and a 40–90°F temperature range with a resistive rating of 10 amps at 120 VAC.
• A dual Fahrenheit/Celsius scale plate and an exposed bimetal thermometer make reading and adjusting setpoints intuitive in the field.
• A separable mounting plate allows mounting and wiring to be completed without removing the cover, saving valuable time on installation and service calls.
• The switching differential is a tight 1.8°F for heating and 2.3°F for cooling, delivering precise temperature regulation that minimizes overshoot and energy waste.
• Concealed, adjustable low and high range stops and a locking cover with Allen screws help prevent unauthorized tampering — a critical feature in commercial and institutional environments.

Where These Thermostats Are Used

These line voltage thermostats operate directly on standard line voltage, eliminating the need for a transformer, and are suited for commercial buildings, industrial facilities, manufacturing plants, and healthcare institutions where reliable and accurate temperature regulation is critical.

Whether you are specifying controls for a new build, retrofitting an aging system, or sourcing replacement parts for an existing Siemens installation, the 134 Series line voltage thermostats offer a well-proven, professionally supported solution. Browse the full Siemens Building Technology brand page for the complete catalog, or explore all line voltage thermostats to compare options across leading manufacturers.