ZENITHSUNelectronics from China
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
ASZ/HASZ Aluminium-Housed Resistors
Wirewound resistors in an anodized 6063 aluminum housing: the alloy-wire element on a heat-resistant insulating former is potted with non-flammable compound that protects it from vibration and dust. ASZ range 40–800 W (housings 4020/4026, 6030/6038) and the high-power HASZ group 1–30 kW (housings 7045, 50107, 12840, 15061, 17565, 175145, 175220). Overload 10× rated power for 5 s and 25× for 1 s, dielectric withstand 1–7 kV AC. Options: built-in or external thermal switch, non-inductive winding, flying leads or metal terminals. For continuous full-load duty, select a resistor rated at 2–3× the load power.
- Power range
- ASZ: 40–800 W; HASZ: 1–30 kW
- Resistance range
- 0.1 Ω – 22 kΩ (depending on size)
- Tolerance
- ±1 %, ±2 %, ±5 % (F, G, J)
- TCR
- ±100…±400 ppm/°C
- Short-time overload
- 5× rated — 10 s; 10× — 5 s; 25× — 1 s
- Insulation
- 1–7 kV AC, 60 s; insulation resistance 50–1,000 MΩ (1,000 V DC)
- Housing
- 6063 aluminum, anodized; flat or heatsink mounting
- Options
- thermal switch; non-inductive winding (N); flying leads or metal terminals
High-Power Wirewound Resistors on Ceramic Tube
High-power wirewound resistors on a ceramic tube: chromium-alloy winding under a non-flammable insulating, heat-dissipating coating baked at several temperatures. DDR/DNR use wire winding, DQR/DQN a corrugated ribbon, DSR has a movable tap for adjustment; non-inductive versions on request. Power 15 W – 20 kW, resistance 0.5 Ω – 68 kΩ, overload 10× rated power for 5 s and 25× for 1 s, dielectric withstand 1–10 kV AC. One resistor can carry several taps; the series is the building block of braking resistor banks and load banks.
- Series
- DDR/DNR (wire), DQR/DQN (corrugated ribbon), DSR (adjustable); non-inductive on request
- Power range
- 15 W – 20 kW
- Resistance range
- 0.5 Ω – 68 kΩ (depending on power)
- Tolerance
- ±1 %, ±2 %, ±5 %, ±10 % (F, G, J, K)
- TCR
- ±200…±400 ppm/°C
- Short-time overload
- 5× rated — 10 s; 10× — 5 s; 25× — 1 s
- Insulation
- 1–10 kV AC, 60 s; insulation resistance 50–1,000 MΩ
- Construction
- ceramic tube, chromium-alloy winding, non-flammable coating; tab terminals for bolt or wire connection
High-Voltage Thick-Film Resistors
Non-inductive thick film resistors: ruthenium paste fired onto 95–96 % Al₂O₃ ceramic. Cylindrical RI80 (RIZ, RIP, RIT, RHP and RTF precision dividers) and flat RI82/RF82 cover 0.25–300 W, 10 Ω – 1 GΩ, maximum voltage up to 80 kV (RHP 300 W), tolerance down to ±0.1 % for RIT and RTF, TCR from ±50 ppm/°C; best results when submerged in dielectric oil or potted in epoxy. ZMP 120–800 W are flat power modules for heatsink mounting (250–800 W on a water-cooled heatsink, rated at 85 °C case): 0.5 Ω – 1 MΩ, insulation 6–10 kV DC.
- Series
- RI80 (RIZ, RIP, RIT, RHP, RTF), RI82/RF82, ZMP
- Power range
- RI80/RI82: 0.25–300 W; ZMP: 120–800 W (on heatsink)
- Resistance range
- RI80/RI82: 10 Ω – 1 GΩ; ZMP: 0.5 Ω – 1 MΩ
- Maximum voltage
- RI82 up to 35 kV, RIZ up to 48 kV, RHP up to 80 kV; ZMP 250–800 W insulation 6–10 kV DC
- Tolerance
- ±1…±10 % (F–K); RIT and RTF down to ±0.1 %
- TCR
- RI80: ±50…±1,000 ppm/°C; ZMP: ±50…±260 ppm/°C
- RTF dividers
- 3–50 W, 10 kΩ – 500 MΩ, dividing ratio 1:1000 and 1:4000
- Technology
- ruthenium thick film on 95–96 % Al₂O₃ ceramic, non-inductive
Water Cooled Resistors
Wirewound resistors with flow-through water cooling: precision alloy winding on a red-copper base, every unit 100 % water-pressure tested for tightness. They run on ordinary tap water, distilled water or other liquid — no costly deionized water required; outlet water 40–60 °C. Versions: SLR-TG copper tube (TG1, TGU, TGS, TGM — 100 W – 10 kW), SLR-ALB aluminum housed (1–10 kW) and SLR-BXG stainless steel. Resistance 0.1 Ω – 20 kΩ, insulation 2.5–6 kV AC. Water must be supplied before power is applied.
- Versions
- SLR-TG (copper tube: TG1, TGU, TGS, TGM, TGUK), SLR-ALB (aluminum housed), SLR-BXG (stainless steel)
- Power range
- SLR-TG: 100 W – 10 kW; SLR-ALB: 1–10 kW
- Resistance range
- 0.1 Ω – 20 kΩ (SLR-TGUK: 2.2–820 Ω)
- Tolerance
- ±1 %, ±2 %, ±5 %, ±10 % (F, G, J, K)
- TCR
- ±100…±260 ppm/°C
- Insulation
- SLR-TG: 2.5–6 kV AC, 60 s; SLR-ALB: 2–7 kV DC, 60 s; insulation resistance 50–1,000 MΩ
- Cooling
- flowing tap or distilled water, or other liquid; outlet water 40–60 °C
Adjustable Resistors & Rheostats
Variable wirewound resistors with continuous adjustment. DST (100 W – 2 kW) and DSY (800 W – 20 kW) are tubular rheostats: chromium-alloy wire on a ceramic tube under a non-flammable coating, with a slider running along the winding; temperature control and a digital scale are available on request. BC1 (12.5–500 W) are tray rheostats: winding on a C-shaped ceramic ring, carbon brush on a rotating shaft, up to six units stacked to 3 kW. Resistance 0.5 Ω – 15 kΩ, tolerance ±5 or ±10 %. DSTB/DSYB adjustable load banks up to 60 kW are built on DST/DSY.
- Series
- DST, DSY (tubular slide type), BC1 (rotary tray type)
- Power range
- DST: 100 W – 2 kW; DSY: 800 W – 20 kW; BC1: 12.5–500 W, stacks up to 3 kW (6 × 500 W)
- Resistance range
- DST/DSY: 1 Ω – 15 kΩ; BC1: 0.5 Ω – 5.1 kΩ
- Tolerance
- ±5 %, ±10 % (J, K)
- TCR
- ±200…±400 ppm/°C
- Adjustment
- continuous: slider along the tube (DST/DSY), rotating shaft with carbon brush (BC1)
- Options
- temperature control and digital scale (DST/DSY); DSTB/DSYB adjustable load banks 100 W – 60 kW
AC Load Banks
AC load banks for testing and maintenance of power sources: resistive DRLB 3 kW – 5 MW with 0.1–15,000 A, single- or three-phase, and intelligent RLC 3 kVA – 5 MVA for 110–690 V AC with resistive, resistive-inductive, resistive-capacitive or RLC loads. Load is applied in steps from the local panel or remotely — via RS232/RS485 from a PC or from a PLC remote control box. Meters display current, voltage, frequency, power and temperature. Fan or water cooling, protection class IP20–IP67.
- Power range
- DRLB: 3 kW – 5 MW; RLC: 3 kVA – 5 MVA
- Voltage
- single- or three-phase; RLC 110–690 V AC; high-voltage versions 6, 10, 35 kV
- Current range
- 0.1–15,000 A
- Load types
- R, RL, RC, RLC
- Control
- step switching from local panel; remote via RS232/RS485 from PC or PLC remote box
- Metering
- current, voltage, frequency, power, temperature
- Protection
- short circuit, over-current, over-voltage, over-temperature, fan failure, audible and visual alarm
- Cooling and enclosure
- fans or water; IP20–IP67 (standard IP20 indoor); ambient −10…+55 °C
DC Load Banks
Resistive DC load banks DRLB for testing and maintenance of DC power sources, switchgear and equipment burn-in: 3 kW – 5 MW, 1 V – 10 kV DC, current 0.1–15,000 A. Built with high-power wirewound, aluminum housed, plate or stainless steel resistors; load is applied in steps with a fine adjustment handle. The panel carries ammeter, voltmeter, ohmmeter and temperature meter, with RS232/RS485 for PC control. Examples include 610 A / 53 V and 200 kW / 10 kV; high-voltage DRLB units for 1–150 kV are air- or transformer-oil-cooled.
- Power range
- 3 kW – 5 MW
- Voltage
- 1 V – 10 kV DC
- Current range
- 0.1–15,000 A
- High-voltage version
- 1–200 kW; 1–150 kV; 22 kΩ – 27 MΩ; air or oil cooling
- Control
- step switches, fine adjustment handle; RS232/RS485 for PC
- Metering
- current, voltage, resistance, temperature
- Protection
- short circuit, over-current, over-voltage, over-temperature, fan failure, audible and visual alarm
- Cooling and enclosure
- fans or water; IP20–IP67; ambient −10…+55 °C
Water Cooled Load Banks
SLRB water-cooled load banks built on water-cooled resistors: 3 kW – 5 MW, 5–1,000 V AC or DC, 0.1–15,000 A. Cooled by flowing tap water, distilled water or other liquid — no deionized-water costs; for the same power the cabinet is lower than an air-cooled one: 50 kW — 700 × 650 × 800 mm versus 680 × 680 × 1,200 mm. Cooling system, pump, tank, cooling tower and piping available on request. RS232/RS485, short-circuit, overload and over-temperature protection. Examples include 400 kW / 1 kV, 770 kW in stainless steel and 96 kW / 400 V DC.
- Power range
- 3 kW – 5 MW
- Voltage
- 5–1,000 V AC/DC
- Current range
- 0.1–15,000 A
- Coolant
- tap or distilled water, other liquid; no deionization required
- Optional equipment
- cooling system, pump, tank, cooling tower, piping, cables
- Control and protection
- RS232/RS485 for PC; short circuit, over-current, over-voltage, over-temperature, alarm
- Dimensions (examples)
- 50 kW — 700 × 650 × 800 mm; 2 MW — 2,400 × 1,800 × 2,000 mm
Battery Short-Circuit Test Load Banks
Low-resistance DRLB load banks for short-circuit testing of traction batteries — ZENITHSUN's flagship product, covered by an invention patent and utility model patents and recognized by TÜV, CATL and Gotion High-Tech. Steps of 1–200 mΩ, short-time current per step 1,000–16,000 A, test duration 5–300 s; two or more steps are usually combined. Power 1 kW – 5 MW, current 0.1 A – 50 kA, voltage 5–1,000 V; a 100 kA bank is also in the range. Knife switches, copper bar terminals, RS232/RS485, short-circuit, overload and over-temperature protection.
- Step resistance
- 1–200 mΩ
- Short-time current per step
- 1,000–16,000 A
- Test duration
- 5–300 s
- Current range
- 0.1 A – 50 kA (100 kA version available)
- Voltage
- 5–1,000 V
- Power range
- 1 kW – 5 MW
- Control
- knife switches and step switches; RS232/RS485 for PC
- Protection
- short circuit, over-current, over-voltage, over-temperature, fan failure, audible and visual alarm
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).
Need help with ZENITHSUN?
An SDS engineer will size the unit for your load and quote it — usually within one business day.