ZENITHSUN
Shenzhen ZENITHSUN Electronic Technology Co., Ltd.
Power resistor and load bank manufacturer. Founded in 2004, 6,000 m² production base in Shenzhen. Braking resistors for VFDs, high-voltage resistors, water-cooled resistors, adjustable rheostats, AC/DC load banks. 20,000+ load banks delivered, 4,000+ customers in 56 countries. 20+ patents, ISO 9001 and IATF 16949 certified.
Electronics
Aluminum Housed Braking Resistors
ASZ/HASZ series — braking resistors in extruded aluminum housing for VFDs and servo drives. Power 60–2000 W, resistance 0.5 Ω…10 kΩ, pulse overload up to 10× for 5 s. Insulation class H (180 °C), IP20/IP54. Tolerance ±5 % (standard) / ±1 % (option), non-inductive winding. Applications: general-purpose and crane VFDs, machine-tool servo drives, elevator drives, wind turbines, electric hoists.
Ceramic Tube Wirewound Resistors
DQR/DDR series — power wirewound resistors on ceramic core with vitreous enamel or cement coating. Power 25–2000 W, resistance 0.1 Ω…50 kΩ, operating temperature up to 300 °C. Constantan/nichrome winding, non-inductive versions for pulse loads. Variants: wall-mount, clamps, terminal blocks, with thermal cutoff. Applications: VFD braking circuits, ballast resistors, voltage dividers, surge dampers in traction and industrial drives.
High Voltage Resistors
RI and ZMP series — high voltage non-inductive thick-film resistors. Operating voltage up to 100 kV, pulse up to 150 kV, power 100–25,000 W, resistance 10 Ω…1 GΩ, tolerance ±1…±5 %, TCR down to ±50 ppm/°C. Subtypes ZMP200/250/400/600 differ in housing and heat dissipation. Applications: dividers for high-voltage test benches, damping circuits of static compensators (SVC/STATCOM), HVDC discharge resistors, measurement circuits of high-voltage converters, medical and X-ray equipment.
Water Cooled Resistors
SLR series — thick-film resistors with forced water cooling. Continuous power 10–500 kW, resistance 0.1 Ω…10 kΩ, permissible operating voltage up to 25 kV, non-inductive design. Deionized water cooling, flow 5–40 l/min at Δt ≤ 40 °C. Stainless-steel housing, threaded fittings G1/2…G1. Applications: braking resistors of large traction VFDs, discharge circuits of HVDC converters, ballast loads of diesel generators, high-power metallurgy servo systems, megawatt-class wind turbines.
Adjustable Resistors & Rheostats
DSY/BC1/DST series — sliding rheostats and adjustable wirewound resistors with handwheel. Power 150–5000 W, resistance 1 Ω…10 kΩ, stepped and continuous adjustment, current up to 50 A. Constantan winding on ceramic core, silent current collector with graphite contact. Versions: single- and dual-section, benchtop (BC1) and stationary (DSY/DST). Applications: laboratory and educational benches, electric-drive commissioning, ballast loads for electric-machine tests, soft-start of low-power DC motors, tuning of thyristor rectifiers.
AC Load Banks
DRLB series — stationary and towable AC load banks (resistive R and resistive-reactive RL/RLC). Voltage 220–13,800 V AC, power 10–5000 kW, regulation step 1–10 kW, power factor 0.8–1.0. Forced air cooling (top/side exhaust), IP23/IP44 cabinet. Digital controller with RS-485/Ethernet, emergency shutdown on temperature, current, overload. Applications: factory acceptance tests of diesel and gas-piston generators, UPS, ship shore-power, wind turbines, commissioning of standalone power plants.
DC Load Banks
DC load banks for testing batteries, UPS, rectifiers, traction cells and photovoltaic systems. Voltage 12–1500 V DC, current 10–5000 A, power 5–2000 kW, modes CC/CV/CR/CP (constant current/voltage/resistance/power). Built-in controller with programmable discharge profiles, V/I/T curve logging, RS-485/Ethernet/USB interfaces. Cabinet with forced cooling, reverse-polarity, overheat and short-circuit protection. Applications: capacity tests of traction batteries for rolling stock and EVs, acceptance of substation DC auxiliary systems, UPS verification, endurance testing of solar storage and Li-ion batteries.
Water Cooled Load Banks
SRLB series — compact water-cooled load banks for high power densities. Power 100–10,000 kW, voltage up to 13,800 V AC / 1500 V DC, step 1 % of rated. Heat-dissipation density 3–5× higher than air-cooled (smaller footprint, quiet operation). Closed loop (water-to-air heat exchanger) or open loop. Controller with data logging and Ethernet/Modbus, protection by coolant flow, temperature and pressure. Applications: factory tests of marine gas turbines and diesel generators, megawatt-class renewables, shore power, data centres, gas-turbine power plants, floating nuclear stations.
Battery & Short-Circuit Testing Load Banks
BT series — benches for battery cycling tests and short-circuit tests. Short-circuit current up to 100 kA, voltage up to 1500 V DC / 10,000 V AC, pulse duration 0.1–10 s with programmable profile. Modes: charge/discharge, CC/CV/CP, load emulation, endurance cycles 10,000+. Measurement accuracy ±0.1 % FS, V/I/T logging at up to 1 ms resolution. Protections: hydrogen gas analysis, cell thermal monitoring, automatic shutdown on thermal runaway. Applications: certification of Li-ion batteries for EVs and ESS, traction-battery tests for mining vehicles, verification of circuit breakers and protection relays against short-circuit currents, type tests of transformers and reactors.
FAQ — ZENITHSUN
What equipment does SDS supply from ZENITHSUN?
SDS delivers the full ZENITHSUN product range including electronics. Detailed series, sizes and technical specifications are available on this page; full PDF catalogues can be downloaded from the Catalogues section.
In which industries is ZENITHSUN equipment used?
ZENITHSUN equipment is applied in metallurgy, mining & mineral processing, power generation and wind energy and other industries. We select a specific model for your duty cycle, load profile, working environment and ambient conditions.
What is the warranty and lead time for ZENITHSUN?
Standard manufacturer warranty — 12 months from commissioning, no more than 18 months from shipment. Production lead time is 4–16 weeks depending on specification (the equipment is manufactured in China, Guangdong Province, Shenzhen). Delivery to Russia is by road transport. Detailed terms are on the Terms of Cooperation page.
How to order ZENITHSUN equipment from SDS?
Send a technical request with operating parameters and requirements. Within one business day we prepare a technical-commercial proposal with firm pricing and delivery schedule. Default Incoterms — DDP (with EAEU certification and customs clearance included).
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