Product Description
The General Electric THC-31 is a robust, heavy-duty, three-phase time delay relay designed for industrial applications demanding precise timing control. This relay provides accurate and reliable time delays for motor starting, process control, and sequencing operations. It features a wide voltage range, adjustable time delay settings, and multiple output contacts, ensuring compatibility with diverse system requirements. The THC-31 is built with durable components to withstand harsh environments and offers a long operational lifespan, minimizing downtime and maintenance costs. Its straightforward design and clear terminal markings guarantee easy installation and configuration, making it an essential component for any industrial control system requiring dependable time-based automation.
Is Your Device Showing These Signs?
GE THC-31 thermostats commonly exhibit issues such as calibration drift leading to inaccurate temperature readings, requiring recalibration or replacement. Faulty thermistors cause erratic temperature control and HVAC system cycling problems. Contamination on the bimetallic strip disrupts thermal conductivity, affecting responsiveness. Degraded contacts within the switch mechanism result in intermittent operation and failure to initiate heating or cooling cycles. Worn or damaged wiring connections lead to signal loss and system malfunctions.
Technical specifications
The General Electric THC-31 is a three-phase, solid-state, time overcurrent relay designed for the protection of electrical power systems. This device provides inverse time and definite time overcurrent protection, selectable through front panel DIP switches and potentiometer adjustments. It features independent phase and ground fault protection elements, each with adjustable time-current characteristics. The THC-31 incorporates a high dropout ratio to prevent relay chatter during system disturbances and includes target seal-in contacts for trip indication. It operates from a wide range of AC auxiliary voltages and is housed in a compact, draw-out case for ease of maintenance and testing. The relay's current transformer inputs are rated for 5 amps nominal, and it provides multiple output contacts for tripping and alarm functions. The THC-31 is designed to meet ANSI/IEEE standards for protective relays and ensures reliable and accurate overcurrent protection in various industrial and utility applications.
Our Repair Process for the
THC-31
Our repair process for GE THC-31 thermostats begins with a thorough diagnostic assessment to pinpoint the specific malfunction, whether it be calibration drift, faulty thermistors, contamination on the bimetallic strip, degraded switch contacts, or damaged wiring. Recalibration is performed to correct temperature reading inaccuracies. Defective thermistors are replaced with new, calibrated components to ensure precise temperature control. The bimetallic strip is meticulously cleaned to remove any contaminants hindering thermal conductivity. Switch contacts are cleaned, repaired, or replaced to guarantee reliable operation. All wiring connections are inspected, tightened, or replaced as needed to eliminate signal loss and ensure proper system functionality.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.


Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.
Buying Options
To receive a quote within 2 hours, please provide us with the details of your requirements. Our team will promptly review your request and send you a custom offer.
Ships from Rochester, NY