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How to Specify a 630kVA Box-Type Substation: 6 Parameters That Decide the Price
Transformer capacity is only one line of the quotation sheet — here is what actually moves the number.
Read More →From 12kV ring main units to 40.5kV metal-clad switchgear, box-type substations and the vacuum breakers inside them — one factory, full traceability, factory-direct pricing for global markets.
Dielectric, mechanical operation and main-circuit resistance tests before leaving the factory — reports shipped with the goods.
Full-process support: distribution scheme design, product selection, drawing confirmation and EPC-level project coordination — not just a catalogue.
Manufacturing base in Yueqing — China's electrical capital — 2 hours from Ningbo port. Seaworthy packing and documentation handled in-house.
Since 2013, Shanghai Jingmin Electric has designed and manufactured switchgear, substations and the core components inside them. Part of Minsai Electric Group, we control the supply chain from vacuum interrupter to complete substation.
KYN28A-12, KYN61-40.5, XGN66-12 and SF6 / solid-insulated ring main units.
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European YBW-12 & American MB pad-mounted, compact substations and E-houses.
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GGD / GCK / GCS / MNS withdrawable assemblies up to 6300A, IEC 61439-2.
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ZW32-12 outdoor, VS1-12 indoor, ZW7-40.5 — self-produced, IEC 62271-100.
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ZnO arresters 0.22–220kV, instrument transformers, cold-shrink terminations.
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S11/S13-M oil-immersed, SCB13 dry-type 30–2500kVA, PV combiner boxes.
View details →Customer-oriented project management — every order follows the same five gates from drawing to commissioning.
We review your single-line diagram and site conditions, then confirm the technical proposal.
Production schedule, material plan and testing plan locked before the first panel is cut.
Assembly and routine tests — every unit gets a documented test report.
Seaworthy wooden cases, container loading supervision and full export documents.
Remote commissioning guidance, spare parts supply and lifetime technical support.
Send your specification or single-line diagram — technical confirmation and price within 24 hours.
Two hours from Ningbo port and one hour from Shanghai port — containers leave weekly for utility, industrial and solar projects across six regions.
Transformer capacity is only one line of the quotation sheet — here is what actually moves the number.
Read More →Footprint, altitude, maintenance interval and total cost of ownership compared for overseas buyers.
Read More →A practical checklist for EPC engineers building utility-scale PV on 35kV collections.
Read More →📧 sales@jingminelectric.com · 📱 WhatsApp / WeChat: +86 130 9198 8913 · ☎️ +86 153 9731 8233
📍 Songjiang District, Shanghai · 🕣 Mon–Sat 8:30–18:00 GMT+8
Tell us what you need — technical confirmation and price within 24 hours.