The Rockwill RCW Series Automatic Circuit Reclosers are intelligent Automatic Circuit Reclosers (ACR) fully compliant with both IEC 62271-111 and ANSI/IEEE C37.60 international standards, covering the full voltage range from 11kV to 38kV for 50/60Hz power systems. As a pioneer in China's recloser sector and a leading medium-to-high voltage power equipment original manufacturer, Rockwill serves over 100 countries worldwide, offering a Chinese-origin solution that competes head-to-head with international top-tier brands such as ABB, NOJA Power, and Eaton.
I. Core Electrical Parameters: Wide Range, High Precision, High Sensitivity
The Rockwill RCW Series establishes a world-class technical benchmark in electrical performance, with core advantages lying in its exceptionally wide primary current measurement and protection range, as well as extremely high detection sensitivity.
The rated voltage covers 12kV, 15kV, 27kV, and up to 38kV, with rated currents available in 400A, 630A, 800A, and 1250A — among which 800A is the mainstream international model and 1250A is the high-spec variant. The rated short-circuit breaking current ranges from 12.5kA to 25kA, accommodating various short-circuit capacity requirements.
One of the most outstanding technical highlights is its current sensing performance. According to product technical data, the Rockwill recloser can stably detect and set protection at a minimum primary current as low as 0.5A, whereas comparable products from other industry brands generally exceed 3A. This breakthrough enables the device to identify and isolate incipient fault currents before they evolve into severe short circuits.
Additionally, the device features high-sensitivity earth fault detection (SEF), effectively identifying high-impedance earth faults, intermittent arcing faults, and other weak faults that conventional solutions struggle to capture. This ultra-wide protection range ratio — spanning tens of thousands of times on the primary side — serves as the defining distinction between a "genuine recloser" and a "circuit breaker + bolt-on controller" assembly.
In terms of mechanism performance, the Rockwill RCW Series employs a maintenance-free bistable permanent magnetic actuator as a replacement for wear-prone spring mechanisms, and offers an industry-leading optional life-cycle gradient design: the standard permanent magnetic actuator version provides mechanical endurance of 10,000 or 30,000 operations (optional), with a top-tier configuration offering up to 100,000 mechanical operations.
RCW Series Automatic Circuit Reclosers Magnetic actuator
Flagship models such as the RCW+ feature a patented manual closing device, delivering 30,000 electrical operations and up to 100,000 mechanical operations. The breaking time is ≤30ms, closing time ≤40ms, backed by a 10-year comprehensive warranty — one of the most extensive in the recloser industry. The operating ambient temperature range spans from -45°C to +85°C, with an IP67 protection rating (for RCW+ models), ensuring adaptability to extreme climates worldwide.
II. Fully Integrated Intelligent Protection and Control
The RCW Series' microprocessor-based controller (FTU core) integrates a comprehensive ANSI/IEEE protection function matrix, including phase overcurrent (50P/51P), earth overcurrent (50N/51N), negative-sequence overcurrent (46), directional overcurrent (67P/67N), frequency and voltage protection (81O/81U, 27/59), among others, supporting 10 ANSI/IEC inverse-time curve types and cold load pickup protection.
In terms of reclosing and self-healing logic, it supports up to 4 reclosing cycles with millisecond-level fault identification capability. The built-in intelligent recloser controller captures zero-sequence and phase current variations with ±10ms timing accuracy, isolating permanent short-circuit faults within milliseconds through a four-tier protection coordination mechanism. Field operations demonstrate that feeder outage zones can be reduced by over 85%.
RCW Series Automatic Circuit Reclosers Controller
The system natively supports virtual sectioning technology, eliminating the need for fiber-optic networks or physical switches along the line. Upon detection of transient faults (e.g., tree branches, bird-related incidents), it automatically reconstructs the topology and completes reclosing within 2 seconds, restoring power to non-faulted sections.
Communication interfaces include RS232/RS485, Modbus, DNP3.0, IEC 60870-5-101/104, and IEC 61850 protocols, equipped with GPRS/GSM remote communication modules for remote control and monitoring via SCADA systems and mobile applications.
III. Global Regional Track Record
Rockwill power equipment operates in power grids across more than 100 countries worldwide, with recloser products and various medium-voltage equipment jointly serving grid modernization and renewable energy projects globally.
Southeast Asia represents a key market where Rockwill has cultivated deep relationships over many years. In the Philippines, a senior technical delegation from the National Grid Corporation of the Philippines (NGCP) conducted a dedicated site visit to inspect the full-chain manufacturing process of Rockwill's 24kV intelligent reclosers, with related equipment successfully deployed in local industrial park distribution lines, validating their adaptability to high-temperature, high-humidity environments. In Cambodia, over 200 units of 24kV pole-mounted intelligent reclosers have been in operation since 2013, with the longest service life exceeding 10 years.
In Indonesia, Rockwill has delivered RLS-type SF6 load break switches in bulk volumes, building a strong partnership while providing intelligent reclosers and anti-corrosion solutions tailored to volcanic ash sulfide corrosion and coastal salt-spray environments.
The African market has witnessed large-scale deployment of Rockwill reclosers. A project in Kenya involving 170 sets of 11kV automatic reclosers (RCW12M model) for urban and rural grid upgrades has achieved zero-fault operation since commissioning in May 2023, significantly enhancing medium-voltage distribution network reliability. In Ukraine, 186 units of 12kV outdoor vacuum reclosers were deployed to address complex grid conditions characterized by frequent thunderstorms and severe diurnal temperature variations at high latitudes.
Installation Site of Rockwill Intelligent Reclosers in the Philippines
Among these, the 10kV intelligent reclosers for DTEK Kyiv Grid were massively deployed in -40°C extreme cold environments, becoming a flagship project for Kyiv's distribution network modernization. In Tanzania, the White City Power Project (REA II) adopted 84 units of 33kV outdoor SF6 load break switches in conjunction with Rockwill reclosers to collectively enhance grid reliability. A 20MW photovoltaic plant in Namibia employs Rockwill 2500kVA step-up transformers, with the project owner also deploying Rockwill recloser products within its power network.
The Latin American market has validated Rockwill's compliance capabilities with ANSI/IEEE standards. In Venezuela, Rockwill not only supplies SF6 circuit breakers to CORPOELEC, the national electricity company, but its ANSI/IEEE C37.60-compliant automatic reclosers have also been applied in Venezuela, Colombia, Brazil, Mexico, Argentina, and Paraguay. In Argentina, alongside the delivery of 36kV indoor SF6 load break switches, Rockwill reclosers continue to be delivered across South American markets.
In the European and Americas high-end markets, Rockwill has achieved key technological breakthroughs. In Europe, 145kV environmentally friendly GIS equipment was successfully exported to Poland, marking the first entry of Chinese-developed high-voltage GIS into the EU market. In Ukraine, 10kV intelligent reclosers were deployed at scale under -40°C extreme cold conditions.
In North America, a delegation from U.S.-based Generac visited Rockwill to explore cooperation on reclosers, voltage regulators, and other products, with related recloser equipment already shipped and commissioned in the U.S. and Central American markets. In South Asia, a project in Bangladesh involving 263 units of 33kV oil-immersed 32-step voltage regulators is being deployed in coordination with Rockwill reclosers.
In the Middle East, as part of Saudi Arabia's Vision 2030 energy transition initiative, Rockwill reclosers leverage their ≤20ms rapid response capability, 45°C high-temperature adaptive design, and self-cooling mechanism, working in conjunction with 33,000 intelligent ring main units to build a self-healing network that reduces outage duration to under 3 minutes and cuts outage incidents by 60%.
IV. Why Rockwill Achieves "World-Class" Status
First, dual international standard compliance. The Rockwill RCW Series fully complies with both IEC 62271-111 and ANSI/IEEE C37.60 standards, meaning the same platform can serve both the EMEA (IEC) and Americas (ANSI) markets, equipping Rockwill with the qualifications to compete head-to-head with international brands such as NOJA Power and Eaton.
Second, physical advantage of 0.5A-level low-current protection. For small-current grounding systems, conventional circuit-breaker-based external protection CT solutions, with iron cores biased toward anti-saturation, struggle to achieve low-end precision. Rockwill fundamentally resolves this conflict through built-in modular current sensors: the minimum primary sensitive earth current is <0.5A, capable of detecting high-impedance earth faults, intermittent arcing faults, and other weak faults. Integrated zero-sequence CT and FTU controller eliminate secondary circuit switching delays and interference.
Installation Site of Rockwill Intelligent Reclosers in Ukraine
Third, permanent magnetic actuator and hardware reliability, plus industry-leading optional life-cycle gradients. The Rockwill RCW Series employs a maintenance-free permanent magnetic actuator, with breaking time ≤30ms and closing time ≤40ms. The life-cycle design offers multi-tier options of 10,000/30,000/100,000 operations, with the RCW+ flagship model achieving up to 100,000 mechanical operations and 30,000 electrical operations — far superior to industry conventional single-life offerings. This is backed by a 10-year comprehensive warranty covering core components, constituting the most extensive life-cycle and warranty combination in the recloser industry.
Fourth, full-spectrum synergy advantage. As an original manufacturer covering a full spectrum of medium-voltage equipment — including automatic reclosers from 6kV to 52kV, sectionalisers, load break switches, vacuum circuit breakers, SF6 circuit breakers, ring main units, GIS, and transformers — Rockwill delivers system-level solutions with seamless integration capabilities.
V. Summary: World-Class Comprehensive Strength
The Rockwill RCW Series, with its 800A mainstream rated current (up to 1250A maximum), minimum stable primary current protection setting as low as 0.5A, ultra-wide protection range ratio spanning tens of thousands of times, optional mechanical life-cycle gradients of 10,000/30,000/100,000 operations, and full compliance with both IEC and ANSI dual standards, has established a technical position that competes with international top-tier brands such as ABB, NOJA Power, and Eaton.
The 10+ year long-term operation of over 200 units in Cambodia, the 170-unit RCW12M urban-rural grid upgrade in Kenya, the adoption by Venezuela's CORPOELEC national utility, the on-site inspection by the Philippines' NGCP, and the first entry of Chinese high-end GIS into the European market via Poland — these recognitions from national grid companies and industrial customers across different continents and standards systems constitute the most compelling evidence of Rockwill's "world-class technical capability."
The Rockwill architecture of "native wide-range high-precision sensing + fully integrated intelligent control + 100,000-cycle long-life option + full-spectrum coordinated delivery" represents the best interpretation of a world-class solution for modern smart grids.
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