| Brand | ROCKWILL |
| Model NO. | Side-Break Switches |
| Rated voltage | 170kV |
| Rated normal current | 2000A |
| number of poles | 3P |
| Conductor type | Al-core |
| Series | TU |
Overview
The TUoffers the most versatility, compared to other side break switches. The unique frame design, with conductor deadends right on the frame, easily orients to the line angle. Additional
positions can be added quickly and with minimal effort. The TU-1AS2 can also be offered in two, three, and four way mounting configurations for inline or 90 degree takeoffs. By adding a specially designed pole bracket, you have maximum switching flexibility.
Features of the TU Beartrap™
● Speed Independent operation—can be closed either fast or slow
● Reverse-loop, silver plated copper jaw contacts— employ the natural repulsion of magnetic fields moving in opposite directions to exert holding forces against the blade edges.
● Components—The 6063-T6 aluminum tubular blade design provides the proper combination of current carrying capacity and rigidity. Silver-plated copper profiles are easily fieldreplaceable, as are the stationary and moving arcing horns.
● Blade Action—Both the blade and jaw contacts are wiped clean during the closing action to ensure a low resistance current transfer. A heavy-duty static blade locking device keeps the blade closed despite temporary faults or surge currents and is designed to pull the blade further into the jaw.
● Anti-Rollover Device—The BearTrap Switch from Turner employs a patented ramp and pin to securely position the blade in the jaw.
● Blade Position Indicator—High visibility stickers provide positive indication of the switch being open or closed. They also have high UV protection and come standard on every switch.
● Current Transfer—There are only two current transfer points in the hinge. The terminal pad is threaded to a stationary contact block creating a spring loaded, silver to silver connection, and the housing transfer current to the blade via a canted coil spring.
● Upgrade-Ability—Ratings can be increased from 600 amps to 1200 amps by adding bolt-on contact fingers to the jaw.
● Main Bearing Assembly And Stationary Insulator Mounting—The main pivot bearing assembly consists of two tapered roller bearings, which are adjusted and factory lubricated.
● Leveling —Leveling screws are provided on the movable and stationary insulator mounting flange for alignment of the insulator stacks. Three bolts are also on the jaw end for small final
adjustments.
● Mounting—All frames are designed and constructed for termination of the transmission line a 10,000 pounds working load. Line angles at full tension are limited to +/-5 Degrees of 90 or 180 Degree dead end. If there is an application outside of these parameters, please contact the factory.
Parameters
-
Ultimate Guide to AC Contactor Abnormal Noise: From Electromagnetic Noise to Mechanical Vibration, Accurate Diagnosis and HandlingIn electrical control systems, AC contactors are among the commonly used electrical components, and they are also a common source of various electrical faults. After long-term use—especially in harsh environments with high levels of dust—AC contactors may sometimes emit squeaking or rattling noises after being pulled in and held. The causes of this phenomenon are analyzed as follows.Squeaking Noise After Pull-In and HoldingA fully functional AC contactor makes no noise when energized and pulledFelix Spark09/11/2025 -
Mismatched AC Contactor Sizing? These 4 Typical Issues You Must Not Ignore – Click to View SolutionsAC contactors (with the electrical schematic code KM) are core electrical devices used to control the connection/disconnection between power supplies and loads in circuits, and they are also common equipment that electricians need to work with regularly. In practice, it is not uncommon to find that some peers make mistakes in selecting AC contactors, leading to improper sizing and subsequent persistent issues. Here, four of the most typical common mistakes are highlighted for reference.I. Over-RJames09/11/2025 -
Comprehensive Guide to High-Frequency Fault Handling of AC Contactors: 90% of Problems Solved with One Method1. Fault Phenomena, Cause Analysis and Handling MethodsContactor does not operate or operates abnormally after coil energization Open circuit in coil control circuit; Check if there is wire breakage or loosening at the terminal blocks. If there is a wire breakage, replace the corresponding wire; if there is loosening, fasten the corresponding terminal block. Coil damage; Measure the coil resistance with a multimeter. If the resistance is ∞, replace the coil. Thermal relay not reset after operatiFelix Spark09/11/2025 -
Proper Installation of AC Contactors | A Practical Guide to Avoid Burning and Misoperation, Master It in One ArticleAC contactors are widely used for switching and controlling power circuits. They use main contacts to open and close circuits, and auxiliary contacts to execute control commands. Main contacts typically only have normally open contacts, while auxiliary contacts often have two pairs of contacts with normally open and normally closed functions. Small-sized contactors are also frequently used as intermediate relays to work with main circuits, thereby achieving the function of remote control or contJames09/11/2025 -
Application and Maintenance of AC Contactors | Comprehensive Analysis of Common Fault Handling, Master It in One Article1 Analysis of Key Components of AC ContactorsAn AC contactor is an automated electromagnetic switch used for long-term, high-frequency switching of AC main circuits and control circuits. It features advantages such as automatic operation, under-voltage and no-voltage protection, high-capacity operation, strong stability, and low maintenance requirements. In the electrical control circuits of machine tools, AC contactors are mainly used to control electric motors and other loads.The key componentFelix Spark09/11/2025 -
Why Do Contactors Always Burn Out? Overload and Short-Circuit Protection Must Be Implemented SimultaneouslyContactors are used to close and open loads that require such operations during normal use, particularly for specific activities like medium-voltage public lighting and industrial electric motors.The medium-voltage contactor + fuse combination controller (F-C) can control motors up to 12 kV. However, medium-voltage controllers are also suitable as feeders for other types of loads, especially transformers. For such loads, contactors are usually modified to include mechanical latching, so that theEcho09/11/2025
-
Intelligent Operation Solution for 12kV Vacuum Circuit Breakers: Integrating Real-time Monitoring & Lifetime OptimizationⅠ. Equipment Operation & MaintenanceIntelligent Monitoring System IntegrationMulti-parameter Real-time Monitoring: Embedded sensors (temperature, displacement, Hall effect current sensors) track contact temperature rise, mechanical characteristics (opening/closing speed, overtravel), coil current, and partial discharge signals. Data undergoes preprocessing via edge computing prior to cloud upload.Lifetime Prediction Model: Dynamically evaluates remaining lifespan using electrical wear dataRockwill06/10/2025 -
SF6 Circuit Breaker Solutions for Outdoor Installation (Anti-Pollution & Seismic Resistance)I.Core Challenges in Outdoor InstallationIn high-voltage transmission and distribution systems, SF6 circuit breakers are exposed to complex outdoor environments for extended periods, facing the following critical issues:Pollution & Insulation DegradationDust, salt fog, and industrial pollutants in outdoor environments easily adhere to equipment surfaces. In coastal or industrial areas, pollution levels may reach Class IV, resulting in insufficient creepage distance and triggering flashoRockwill05/12/2025 -
12kV Indoor Vacuum Circuit Breaker Southeast Asia Solution: Anti-Corrosion Compact Design12kV Indoor Vacuum Circuit Breaker Southeast Asia Solution: Anti-Corrosion Compact DesignⅠ. Executive SummarySoutheast Asia faces rapidly growing electricity demand alongside environmental challenges including high temperatures, humidity, salt spray corrosion, and grid instability. This solution recommends Solid Insulated Pole-Mounted Vacuum Circuit Breakers (VCB) featuring high reliability, compact design, and smart monitoring. Tailored for tropical climates and industrial scenarios, itRockwill06/10/2025
