Any listing in this product directory or other related materials, where “NRTL” appears next to the product name was tested and is listed by ARL as an NRTL, consistent with the requirements of the NRTL Directive.  Other products are listed solely by ARL under its accreditation to ISO 17025 and ISO 17026.


The products listed here are electrical devices for control of air conditioning, heating, cooking, refrigeration, and humidity equipment, rated 600 volts or less, and are intended for use in ordinary locations in accordance with the National Electrical Code.

The product listings include general use equipment for field installation and controls intended to be factory installed on or in certain appliances as safety, limiting, or operating controls.  The controls respond directly or indirectly to changes in temperature, humidity, or pressure to effect control of equipment or appliance operation.  Devices covered by this category of products include:

Refrigeration Controllers - Humidistats for factory installation on or in refrigeration equipment; pressure, temperature, pneumatic pressure, motor, timer, bimetallic-heater, magnetically operated controls, and the like, and combinations thereof in control panels with or without transformers.

Industrial Operating Controls - Temperature controllers for industrial, farm, and boiler room applications; snow melting controls; return duct humidistats; humidity controllers; pneumatic pressure regulators; transformer (low-voltage secondary) relays; pneumatic pressure, bimetallic-heater, motor, timer, and magnetically operated sequence switches; stoker controls; indicating and recording controls; and motor operators for actuating air dampers.  The requirements do not cover output connected apparatus such as dampers, linkages, or valves.

Residential Operating Controls - Room thermostats, room humidistats, and other operating controls for residential heating and cooling appliances.

Controls For Factory Installation On Or In Appliances - (1) Controls as mentioned previously, but specifically intended for use on, in, or as a part of the end use equipment; (2) water heater controls intended to regulate or limit water temperature and; (3) other controls including door interlock thermostats for self-cleaning ovens; baseboard heater temperature limiting controls; humidifier controls; fan thermostats; and temperature regulating and limiting thermostats for electric heating equipment such as clothes dryers, air heaters, household and commercial cooking appliances, beauty parlor equipment, steam and dry bath heaters, and ranges (controlling oven or surface elements).

Certain safety controls, and safety control circuits on operating controls have been judged under the requirements of the standard, insofar as they apply, and also under the applicable requirements for limit controls.

The following devices are among those considered to be refrigeration controllers:

  1. A control that either directly or indirectly controls the starting and stopping of a compressor motor of refrigeration or air conditioning equipment because of variations in temperature, pressure, refrigerant level, or the like.
  2. A pressure limiting device and a defrost temperature limiting device for refrigeration or conditioning equipment.
  3. A wall mounted room thermostat not intended for mounting in or on refrigeration or air conditioning equipment has been judged as a thermostat and not as a refrigeration controller.
  4. Industrial temperature indicating and regulating controls include controls that are intended, among other applications, for installation in or on industrial apparatus, or for boiler or furnace room, farm, outdoor, and comparable locations that may not always be clean and dry.

    A residential control is one intended for indoor comfort control use in clean, dry, nonindustrial environments, such as dwellings, offices, and stores.

    A humidistat has been judged in the same manner as a thermostat.

    Requirements for controls intended to be factory installed on or in appliances may include requirements appropriate for the end use appliance.

    The requirements for this category of products do not cover primary safety or limit controls for gas, oil, or electric fired central heating furnaces or boilers; duct heaters; oil or gas burners; or stokers; nor do they cover controls for oil pumps and oil level regulators; boiler feed or low water cutoffs; or furnace fan or boiler circulators.

    In addition, requirements for this category of products do not cover low voltage thermostats, damper controls or similar devices intended for connection only to a low voltage circuit of limited power supplied by a primary battery or by a Class 2 transformer.  An assembly consisting of a line voltage transformer with a low voltage secondary incorporated as an integral part of a control such as a thermostat or a damper control is considered to be within the scope of these requirements.

    Each product is marked with the name or trademark of the (manufacturer) or vendor, a distinctive style, type, catalog or model designation, electrical ratings, date code, electrical hazard and other cautionary warnings and restriction as applicable.

    These products comply with ARL requirements which include pertinent sections of the Standard for Safety, ANSI/UL 873, Temperature Indicating and Temperature Regulating Equipment.

    A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements of the standard, and that involve a risk of fire, electric shock, or injury to persons, have been evaluated using the appropriate additional component and end-product requirements as determined necessary to maintain the acceptable level of safety as originally anticipated by the intent of the standard.  A product whose features, characteristics, components, materials, or systems conflict with specific provisions of the standard have been judged to be in non-compliance with the standard.

    Only products which properly bear the ARL Listing Mark (Label) are considered Listed by ARL.


    Delisted products appear with a double strike through and “DELISTED” after the report number.
    Deleted/revised models for listed products appear with a single strike through.



    Listed Product Directory (revised 01.13.15)