Rockwill has confirmed that its 145kV high-voltage dead tank circuit breaker, also known as 145kV dead tank GCB, has successfully passed KEMA Labs type testing and obtained the official test report. The certified model is designed for outdoor air-insulated substations, transmission switching stations, transformer bays, renewable energy collector and grid-interconnection bays, and industrial high-voltage distribution.
With rated current up to 3150A and short-circuit breaking capacity options of 40kA and 63kA, the product is positioned for markets that require independent third-party validation under IEEE, ANSI and applicable IEC high-voltage switchgear standards.
The 145kV dead tank GCB uses a grounded metal tank enclosure with bushings for line and transformer connections, which reduces exposed live parts and supports integrated current transformer installation, seismic-rated structures and harsh-environment operation. Rockwill specifies the series for IEEE/ANSI C37.04 compliance, with dead tank configuration, double opening coil control, spring or equivalent operating mechanism options, and enhanced safety features for outdoor grids.
For eco-friendly variants, Rockwill’s 145kV dead tank portfolio also includes SF6-free solutions: the RVD-145 clean-air vacuum dead tank breaker is documented at 3150A and 50kA with IEC 62271-1, IEC 62271-100 and relevant ANSI/IEEE compliance , while g3-insulated dead tank options are documented at 3000A and 63kA with IEEE 693 seismic capability . The KEMA-reported 40kA/63kA SF6 or project-specified version gives utility buyers a conventional interrupting platform with broader short-circuit duty coverage.
KEMA Labs, part of CESI, performs high-power and high-voltage type tests for dead tank circuit breakers, live tank circuit breakers, GIS and related switchgear. Its high-power laboratories cover short-circuit making and breaking, terminal fault, short-line fault, out-of-phase, capacitive switching, reactor switching, temporary and short-time withstand duties, and dielectric verification, with deliverables including type test reports, certificates and conformity documentation . For a 145kV GCB, an independent KEMA report gives EPCs, utilities and grid operators third-party evidence on breaking capacity, insulation coordination, mechanical endurance and technical documentation traceability, reducing repeated in-house qualification during international tenders.
From a grid application perspective, 145kV sits in the core subtransmission and primary transmission band. Industry procurement analysis places 72.6kV to 145kV among the largest dead tank breaker revenue segments because the rating serves substations, renewable interconnection, industrial power plants and distribution-to-transmission interfaces . Dead tank designs are preferred where buyers need grounded enclosures, integrated CTs, high pollution resistance, coastal or desert adaptation, high altitude configurations and seismic performance. Grid modernization and renewable programs further increase demand for 145kV-class breakers that can handle variable fault levels from solar and wind plants, support faster switching, and reduce lifecycle maintenance through condition monitoring .
Rockwill stated that the KEMA milestone supports expansion in markets where IEEE/ANSI documentation is mandatory, including North America, the Middle East, Southeast Asia, Latin America and selected utility EPC projects. The company’s 145kV dead tank roadmap covers SF6, SF6-free vacuum with clean air, and low-global-warming-potential g3 alternatives, allowing owners to match carbon targets without changing bay layout where retrofit-compatible platforms are selected. For smart substation projects, the breaker can be offered with monitoring-ready control, mechanism status, gas or vacuum compartment diagnostics, and IEC 61850-aligned asset data where specified.
The KEMA type test result strengthens Rockwill’s high-voltage credibility against global dead tank competitors and supports total-cost-of-ownership comparisons. Buyers evaluating 145kV GCB suppliers should review rated continuous current, symmetrical and asymmetrical breaking current, BIL and power-frequency withstand, mechanical endurance class, seismic certification, CT integration, bushing type, gas or vacuum compartment leakage, and the exact KEMA report scope. Rockwill’s combination of 3150A rating, 40kA/63kA breaking options and dead tank safety design is intended to shorten bid technical clarification and accelerate factory inspection, FAT and site commissioning for 145kV AIS, hybrid and renewable substation packages.
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