All three share the identical core, winding process, mounting dimensions, and enclosure options — they differ only in no-load and load losses, defining their efficiency class: (1) SCB10 — standard/legacy entry model, baseline losses, for budget-sensitive projects, temporary installations, and non-critical loads. (2) SCB11 — mainstream energy-saving model, lower no-load and load losses than SCB10, for mainstream indoor substations and commercial/industrial distribution. (3) SCB12 — high-efficiency model, lowest losses in the series, for long operating hours, energy-saving tenders, and green-building projects. Exact loss values (W) for each capacity follow GB/T 1094.12 / GB 20052-2020; contact us for the type-test report of your required capacity. Because the footprint and spare parts are identical, upgrading from SCB10 to SCB11 or SCB12 does not change the installation.

Dry-type (cast resin) and oil-immersed transformers each have ideal use cases. Choose the SCB dry-type when: (1) Fire safety is critical — no insulating oil means no risk of oil pool fires, toxic fumes, or soil contamination; safe inside occupied buildings, basements, tunnels, and hospitals. (2) No oil containment, fire-separation walls, or fire-suppression systems are needed — reducing civil works and installation cost. (3) Installation must be close to load centers indoors (e.g., on a building floor or in an electrical room) where an oil-filled unit would not comply with fire codes. (4) Low maintenance — no oil sampling, conservator, or silica gel to service. Choose oil-immersed (e.g., the GOHO S11 series) when: (1) Outdoor pole-mounted or ground-mounted installation is planned. (2) Higher capacity or lower cost per kVA is required at the same efficiency. (3) Ambient conditions are suitable for oil-based units. The dry-type generally costs more upfront but saves on civil works, fire protection, and maintenance in indoor applications.

Both Class F and Class H use vacuum-cast epoxy windings, but they differ in temperature rating and allowable temperature rise: (1) Class F — maximum winding temperature 155°C, allowed temperature rise 100K above a 40°C ambient. This is the standard choice for most indoor commercial and industrial distribution at normal ambient temperatures. (2) Class H — maximum winding temperature 180°C, allowed temperature rise 125K. Recommended for: high-ambient-temperature locations (above 40°C), high-duty-cycle or overloaded service, enclosed installations with reduced ventilation, or where extra thermal margin is desired for extended winding life. Class H costs slightly more but provides greater thermal headroom. If your ambient temperature is within -25°C to +40°C and the transformer is properly ventilated, Class F is normally sufficient. Specify Class H for environments above +40°C or when future load growth is anticipated.

The SCB series supports two cooling modes: (1) AN (Air Natural) — standard, self-cooled by natural air convection through the winding ducts and core. No fans, no auxiliary power, lowest noise, and zero cooling maintenance. This is the default for normal continuous operation at rated capacity. (2) AF (Air Forced) — optional axial fans mounted at the base of the windings blow air upward through the winding ducts, increasing the heat-dissipation rate and boosting the transformer's capacity by typically 30–40% above the AN rating. AF is useful for: temporary peak loads (e.g., seasonal or short-duration overloads), installations where a smaller AN-rated transformer is desired but occasional overloads occur, or high-ambient-temperature environments. Fans are thermostatically controlled and only run when needed, so normal operation remains fan-free and quiet. If your load is steady at or below the AN rating, AN is sufficient and preferred.

The SCB core and coil assembly is IP00 (open) by design, but a range of enclosures is available: (1) IP00 — open core & coil, for dedicated transformer rooms where access is restricted to authorized personnel only; maximum cooling. (2) IP20 — standard ventilated enclosure, prevents finger contact with live parts; suitable for most indoor electrical rooms. (3) IP23 — prevents dripping water from above entering; suitable for damp indoor areas or where water spray is possible. (4) IP31 — prevents tools/wires from entering and dripping water; suitable for industrial environments. (5) Up to IP54 — dust-protected and splash-proof, for more demanding indoor or semi-outdoor (sheltered) locations. Enclosures can be ventilated (for AN cooling) or closed (with forced-air cooling). For occupied public areas, always use at least IP20 with locked doors. Provide your installation environment (electrical room, basement, public corridor, sheltered outdoor) and we will recommend the right enclosure IP rating.

Selection depends on load, network, and operating profile: (1) Capacity (30–2500 kVA) — size for total connected load with 20–30% growth margin; e.g., a 1000 kVA transformer serves ~800 kW at 0.8 PF. Consider motor-starting inrush and future load additions. (2) Connection group — Dyn11 (HV delta, LV star+neutral, 400V/230V three-phase+neutral) is the standard for modern commercial/residential mixed loads and offers better harmonic handling. Yyn0 (HV star, LV star+neutral) is used where the utility requires a star primary or for mostly balanced three-phase loads. Dyn11 is generally preferred. (3) Model — choose SCB10 for budget-sensitive or temporary projects; SCB11 for mainstream indoor substations; SCB12 for high-duty-cycle, energy-saving, or green-building tenders. (4) Also specify: HV voltage (10/11/10.5kV), LV voltage (400/415/690V), frequency (50/60Hz), winding material (copper/aluminum), insulation class (F/H), and enclosure IP. Provide your single-line diagram and we will recommend the optimal configuration and quote accordingly.