The Drop Out Surge Arrester integrates a distribution-type zinc oxide arrester with a drop-type fuse mechanism, allowing testing, maintenance, and replacement without interrupting power supply. Ground-level replacement using insulated tools enhances safety, while visual indication through drop-out upon failure reduces unnecessary replacements and aids fault detection. The device is particularly suited for critical locations such as communication centers, airports, hospitals, and commercial districts where continuous operation is essential.
Technical specifications include Metal Oxide Varistor (MOV) elements with nonlinear voltage-current characteristics and composite polymer housings for pollution and moisture resistance. Models feature rated voltages from 10 kV to 36 kV, continuous operating voltages up to 29 kV, residual voltages under lightning impulse up to 108 kV, and withstand capabilities of 150 A square wave currents or 65 kA high current impulses. The device complies with GB11032 and IEC60099-4 standards.
Application spans power transmission and substation systems up to 35 kV, protecting against lightning and switching overvoltages in industrial settings including oilfields and distribution networks. Operating conditions require ambient temperatures of -40°C to +40°C, altitudes below 2,000 meters, maximum wind speeds of 35 m/s, and earthquake intensity not exceeding 7 degrees. Installation requires matching rated voltage with system voltage, maintaining 15° to 30° angle from vertical, with minimum clearances of 200 mm from grounded structures and 350 mm between phases.
Drop Out Surge Arrester Wholesaler with 21 Years of Expertise
RaxPower is a reliable supplier, factory, and manufacturer of high-quality Drop Out Surge Arresters, located in Hebei Province, China. Established in 2003, we have 21 years of manufacturing and exporting experience. The Drop Out Surge Arrester is skillfully installed on the drop-type mechanism after refitting the distribution-type zinc oxide arrester, enabling detection, maintenance, and replacement with an insulation pull lever without power interruption. This not only ensures line continuity but also greatly reduces the work intensity and time for maintenance personnel, particularly in unsuitable places such as post and telecommunications, airport stations, hospitals, and bustling business districts.
Our company prioritizes safety and quality in all products, utilizing high-quality materials and advanced composite jacket technology with anti-fouling advantages to provide reliable protection for valuable electrical equipment. The arrester features a disengagement device that allows automatic disconnection in case of abnormal failure, preventing accident expansion. With strict quality control, we employ manufacturing processes including casting, cold punch, forged, welding, and automatic machines for accurate sizing and uniform products. Our hot-dip galvanizing ensures smooth, bright surfaces per ISO 1461, and products undergo load tests and gauge tests according to IEC standards, having passed SGS tests to ensure optimum performance and reliability.
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| Model Type | Rated Voltage (kV) | System Highest Voltage (kV) | MCOV (kV) | Nominal Discharge Current (kA) | DC Reference Voltage (U1mA) (kV) | 0.75U1mA Leakage Current (μA) | Lightning Impulse Residual Voltage (kV) | Switching Impulse Residual Voltage (kV) | Steep Impulse Residual Voltage (kV) | Square Wave Current Withstand (A) | High Current Impulse Withstand (kA) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| HY5WS-10/30DL | 10 | 11 | 8.4 | 5 | 15 | 30 | 30 | 25.6 | 36 | 150 | 65 |
| HY5WS-17/50DL | 17 | 18 | 13.6 | 5 | 25 | 30 | 50 | 42.5 | 57.5 | 150 | 65 |
| HY5WS-33/99DL | 33 | 36 | 26.8 | 5 | – | – | 99 | 84.7 | 104.5 | 150 | 65 |
| HY5WS-36/108DL | 36 | 38 | 29 | 5 | – | – | 108 | 92.4 | 114 | 150 | 65 |
Frequently Asked Questions (FAQS)
What is a drop out surge arrester and how does it work?
A drop out surge arrester is a distribution zinc oxide arrester integrated into a drop-type fuse mechanism. During surges, it conducts excess energy to ground, protecting connected equipment. If an abnormal fault occurs, a disengagement device uses power frequency short-circuit current to trigger automatic disconnection, causing the arrester components to drop out—providing visual indication of failure and preventing accident expansion. This design enables testing, maintenance, and replacement without power interruption, ensuring line continuity and reducing work intensity for maintenance staff.
What are the key advantages and applications?
Key advantages include enhanced safety by allowing replacement from the ground with a hotstick, reliable visual indication only upon expiration, simplified fault detection, and reduced replacement time from minutes to seconds. They are ideal for power transmission and distribution systems, substations, industrial applications, and renewable energy installations—especially critical locations like telecommunications centers, airports, hospitals, and business districts where power interruption is unsuitable. They protect against overvoltages from lightning strikes and switching operations.
What are the installation and maintenance requirements?
Install at a 15° to 30° angle from vertical, with minimum 200 mm clearance from grounded structures and 350 mm between phases. Ensure rated voltage matches the system. Connect the top terminal to the high-voltage line and bottom to ground, verifying all connections are secure. Maintenance includes regular visual inspections, insulation resistance measurement, DC 1mA voltage check, and leakage current assessment. Replacement can be done without power interruption using a hotstick. If the unit drops out, replace only the unit—the dropout mechanism remains intact.
What quality standards and certifications do your surge arresters meet?
Our products meet international standards including IEC 60099-4 and GB 11032, with ISO9001-compliant quality control from raw materials to finished products. They have passed SGS tests and evaluations by authoritative research institutes. We utilize advanced manufacturing processes like hot forging and automated machinery, with all products undergoing load testing and galvanization per ISO 1461 for durability in harsh environments.
Can you handle large bulk orders with guaranteed delivery timelines?
With over 21 years of manufacturing experience and 17,000 square meters of production space, we typically complete most orders within 2 to 3 weeks, with larger projects requiring 1 to 1.5 months maximum. Our efficient processes using semi-automatic molds and automated machinery enable us to manage tight schedules while maintaining quality. We offer competitive pricing through robust supply chains and rigorous quality inspections at every production stage, ensuring consistent quality that protects your brand.
What warranty coverage do you provide?
RaxPower offers a two-year warranty from delivery date. Under normal operating conditions, any quality issues that prevent use will be addressed with repair or replacement at no additional cost.
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