°STELPRO electronic thermostats are designed to meet the highest safety standards. Each unit is certified by agencies such as CSA and UL. Their seals of approval are widely recognized and accepted by the relevant authorities, safety inspectors and experts, code enforcers as well as major manufacturers, distributors and retailers.
The standards applicable to electronic thermostats make it possible to guarantee their safety fully during use, even in the event of a wrong product selection, incorrect installation or eventual failure.
All our housings are designed to withstand major impacts without exposing the user to possible electrical shocks. During testing, we drop a sphere two inches in diameter that weighs more than one pound from a height of 51 inches onto the device’s housing.
The materials used in the design of electronic boards and housings meet the UL94-5VA standard, which is the most stringent in terms of flame resistance. Even in the event of extreme electronic circuit failure, the housing must be able to contain flame propagation and ensure the protection of the users by not exposing any live component.
Transient phenomena: Electronic circuits are designed and tested to resist power surges, momentary interruptions, undervoltages and other transient network phenomena caused by lightning, power outages or any other event that affects power supply quality.
Electrical overloads: During testing, thermostat power circuits are overloaded with current representing more than 150% of their rated capacity. They must also withstand short-circuit tests that simulate a bad connection.
Electronic circuits are designed to remain safe even in the event certain critical components fail. During testing, failures are deliberately provoked to check the devices’ tolerance. Devices must remain safe at all times.
At °STELPRO, we perform rigorous tests on every product we design to ensure they meet the safety standards of the countries where they are sold. For controls, we use the UL60730 or CSA C22.2 No.24 standards. A list of tests performed is outlined in Table 1.
We also perform tests that go beyond what safety standards require, ensuring better quality and longer life for our products.
Our thermostats are subjected to a battery of intensive environmental tests under high-temperature and -humidity conditions, among other things. They must remain fully functional and safe.
List of tests performed on our products (based on the UL60730 standard).
|UL60730-1, 11||Construction Requirements – Materials||
See Annex D and/or UL746C for Requirement of Polymeric enclosures.
Must be 5VA rated: This is the highest (most flame retardant) UL94 rating.
|UL60730-1, 14||Heating – Electrical Test parameters||
Not a voltage sensitive circuit therefore loaded to most unfavorable current which is 1.06 times the rated current.
Voltage may not be lower than 10% of rated voltage.
We verify that at a maximum control temperature (30°C) the electrical components and materials remain inside their specified operating limits.
|UL60730-2_09, 17||Endurance – Overload + Endurance Tests||
Two samples required designated shall be subjected to 50 ON/OFF cycles of operation at a rate of 6/minute at the following value:
SAMPLE 1 and SAMPLE 2 shall be subjected to 6000 cycles at a rate of one per minute (3sec ON, 3sec OFF) at 110% of both the rated current and voltage.
SAMPLE 2 shall be subjected to an additional 30000 cycles at rated voltage and current.
+ section 56
|Resistance to impact||
No live part shall become accessible;
Dielectric test required after impact to verify if a risk of electric shock is possible.
56.3 – Ball impact test
56.4 – Samples shall be cooled to a temperature of 0°C for 3 hours prior to testing (test done on sample still cold)
|UL60730-1, 21||Resistance to Heat, Fire and Tracking – General||All non-metallic parts shall be resistant to heat, fire and tracking. UL746C is used as the reference standard for compliance in the US. 5VA material shall be used to encapsulate live parts. V-0 or other flame resistant material can be used on parts that do not contain live parts;|
|UL60730-1, H.26.5||EMC Requirements - Voltage Dips/interruptions/Variations||
Control shall tolerate voltage dips and interruptions in the power supply network:
Voltage Dips: 30%, 0.5s – 60% , 0.5s
Voltage Interruptions: 100%, 1 cycle of supply waveform every 0.5s and 60s
10 seconds between each dip or interruption
Control shall tolerate short term supply variations
Execute voltage variations three times;
|UL60730-1, H.26.8||EMC Requirements – Surge Immunity Test||For AC Mains:
|UL60730-1, H27||Abnormal Operation – Faults Testing||
Control shall be wrapped in cheesecloth
Temperatures shall not exceed 1.5 times the values of clause 14 for reinforced insulation except in the case of thermoplastic material.
Shall comply with clause 8 and 13.2
Types of components tested;