Contactor,circuit breaker,solar inverter,electric meter,solar batteries
Core Parameters and Selection Guide for
- Overview
TND1-3 is a single-phase high-precision fully automatic AC voltage stabilizer (improved SVC series) by CHINT. With a rated capacity of 3 kVA (3000 W), it is specially designed for 220V single-phase power grids with voltage fluctuations, automatically stabilizing the output at 220V to ensure stable equipment operation.
- Key Technical Specifications (CHINT Standard)
| Item | Value | Description |
| Rated Capacity | 3 kVA | Maximum active power 3000 W |
| Phase | Single‑phase | For 220V residential / light industrial use |
| Input Voltage Range | 160V – 250V AC | Suitable for low‑voltage fluctuating environments |
| Output Voltage | 220V AC ±4% | High regulation accuracy, stable output |
| Over‑voltage Protection | (246±4)V | Automatic cutoff when overvoltage occurs |
| Under‑voltage Protection | (180±8)V | Automatic cutoff when undervoltage occurs (not available for 1.5 kVA and below) |
| Voltage Regulation Speed | < 6 seconds | Fast response to input voltage changes |
| Dimensions | 240×305×245 mm | Approx. 24cm×30.5cm×24.5cm |
| Weight | Approx. 11.5 kg | Portable design for easy handling |
| Standard | Q/ZT 78 | Complies with corporate standard |
- Working Principle
It consists of a contact auto-voltage regulator, servo motor, and automatic control circuit. When the mains voltage fluctuates, the control circuit samples and amplifies the signal, driving the servo motor to move the carbon brush along the regulator coil, automatically adjusting the output voltage to the rated 220V for stable regulation.
- Applications
- Residential Use: Refrigerators, air conditioners, computers, TVs, etc., especially in low-voltage areas
- Office Equipment: Printers, servers, precision instruments
- Industrial / Commercial: Small automation equipment, testing instruments, medical devices, lighting systems
- Unstable Grid Areas: Rural areas, remote regions, old residential communities, etc.
- Selection and Usage Notes
- Load Matching: The starting current of inductive loads (e.g., air conditioners, refrigerators) is 2.5-3 times the rated power. Sufficient margin must be reserved to avoid overload.
- Installation Environment: Well-ventilated, away from moisture, dust, and corrosive gases; ambient temperature -10℃ - 40℃
- Wiring Rules: Input connected to mains, output to load; reliable earthing of the enclosure for safety
- Protection Functions: Equipped with over-voltage and under-voltage protection; automatically cuts off output during faults to protect loads
- Brands and Alternatives
The mainstream brand is CHINT. Alternatives with equivalent specifications include Delixi, People Electric, etc. Replacement models with matching parameters can be selected.
Cross-Brand Model Comparison for CHINT Voltage Stabilizers (Single-phase / Three-phase)
- General Notes
CHINT TND1 series (single-phase SVC) and TNS1 series (three-phase SVC) are industry-standard high-precision fully automatic AC voltage stabilizers. Model names vary slightly between brands, but core parameters are consistent.
The comparison is grouped by rated capacity, covering mainstream sizes from 0.5 kVA to 30 kVA for direct replacement.
Key selection criteria: matching rated capacity, input voltage range, regulation accuracy, and protection functions. A 2.5-3 times starting current margin is recommended for inductive loads (air conditioners, refrigerators).
- Single-phase Voltage Stabilizers (220V)
| CHINT | Delixi | People Electric | TENGEN | Key Parameters |
| TND1‑0.5 | TND‑0.5K | SVC‑0.5KVA | TND‑0.5K | 0.5 kVA, input 160–250V, output 220V±4% |
| TND3‑0.5K | RMSPD‑0.5K | |||
| TND1‑1 | TND‑1K | SVC‑1KVA | TND‑1K | 1 kVA, input 160–250V, output 220V±4% |
| TND3‑1K | RMSPD‑1K | |||
| TND1‑1.5 | TND‑1.5K | SVC‑1.5KVA | TND‑1.5K | 1.5 kVA, input 160–250V, output 220V±4% |
| TND3‑1.5K | RMSPD‑1.5K | |||
| TND1‑2 | TND‑2K | SVC‑2KVA | TND‑2K | 2 kVA, input 160–250V, output 220V±4% |
| TND3‑2K | RMSPD‑2K | |||
| TND1‑3 | TND‑3K | SVC‑3KVA | TND‑3K | 3 kVA, input 160–250V, output 220V±4% |
| TND3‑3K | RMSPD‑3K | |||
| TND1‑5 | TND‑5K | SVC‑5KVA | TND‑5K | 5 kVA, input 160–250V, output 220V±4% |
| TND3‑5K | RMSPD‑5K | |||
| TND1‑10 | TND‑10K | SVC‑10KVA | TND‑10K | 10 kVA, input 160–250V, output 220V±4% |
| TND3‑10K | RMSPD‑10K | |||
| TND1‑15 | TND‑15K | SVC‑15KVA | TND‑15K | 15 kVA, input 160–250V, output 220V±4% |
| TND3‑15K | RMSPD‑15K | |||
| TND1‑20 | TND‑20K | SVC‑20KVA | TND‑20K | 20 kVA, input 160–250V, output 220V±4% |
| TND3‑20K | RMSPD‑20K | |||
| TND1‑30 | TND‑30K | SVC‑30KVA | TND‑30K | 30 kVA, input 160–250V, output 220V±4% |
| TND3‑30K | RMSPD‑30K |
- Three-phase Voltage Stabilizers (380V)
| CHINT | Delixi | People Electric | TENGEN | Key Parameters |
| TNS1‑3 | SJW‑3K | SVC‑3KVA (3‑phase) | TNS‑3K | 3 kVA, input 304–456V, output 380V±4% |
| SJW3‑3K | ||||
| TNS1‑6 | SJW‑6K | SVC‑6KVA (3‑phase) | TNS‑6K | 6 kVA, input 304–456V, output 380V±4% |
| SJW3‑6K | ||||
| TNS1‑9 | SJW‑9K | SVC‑9KVA (3‑phase) | TNS‑9K | 9 kVA, input 304–456V, output 380V±4% |
| SJW3‑9K | ||||
| TNS1‑15 | SJW‑15K | SVC‑15KVA (3‑phase) | TNS‑15K | 15 kVA, input 304–456V, output 380V±4% |
| SJW3‑15K | ||||
| TNS1‑20 | SJW‑20K | SVC‑20KVA (3‑phase) | TNS‑20K | 20 kVA, input 304–456V, output 380V±4% |
| SJW3‑20K | ||||
| TNS1‑30 | SJW‑30K | SVC‑30KVA (3‑phase) | TNS‑30K | 30 kVA, input 304–456V, output 380V±4% |
| SJW3‑30K | ||||
| TNS1‑40 | SJW‑40K | SVC‑40KVA (3‑phase) | TNS‑40K | 40 kVA, input 304–456V, output 380V±4% |
| SJW3‑40K | ||||
| TNS1‑50 | SJW‑50K | SVC‑50KVA (3‑phase) | TNS‑50K | 50 kVA, input 304–456V, output 380V±4% |
| SJW3‑50K |
- Special Series Comparison
| CHINT Series | Features | Equivalent Brand Models |
| TND2 Series | Intelligent, response time < 1s | Delixi TND2 Series |
| People Electric SVC‑II Series | ||
| TND3 Series | Wall‑mounted, compact size | Delixi SVC‑B Series |
| People Electric SVC‑B Series | ||
| TND6 Series | Wide input voltage (140–260V) | Delixi TND6 Series |
| TENGEN TND6 Series | ||
| TM Series | Ultra‑low voltage starting (≤ 130V) | Delixi TM Series |
| People Electric TM Series | ||
| SBW / TNSZ | High‑power compensated type | Delixi DBW / SBW Series |
| People Electric DBW / SBW Series |
- Selection and Replacement Guidelines
- Capacity Matching: Prioritize matching by rated capacity (kVA). Inductive loads (motors, compressors) require 2.5-3 times oversized selection.
- Voltage Range: Ensure input range matches local grid; wide-voltage models (e.g., TND6) suit highly fluctuating areas.
- Protection Functions: Over-voltage, under-voltage, and over-current protection are standard. Premium models add delay start and surge protection.
- Mounting: Floor-standing for high power, wall-mounted for limited space, portable for mobile use.
- Standards: All comply with JB/T 8749.7, ensuring high interchangeability.
Below are the most practical and common applications of CHINT voltage stabilizers (mainly single-phase TND1 and three-phase TNS1) for residential, commercial, industrial, weak-current, medical, and agricultural scenarios, matched to real working conditions for easy selection.
- Residential & Household Applications (Single-phase TND1 Series)
Suitable for: old communities, rural areas, urban villages, and homes with persistent low or unstable voltage
- General Household Regulation
Refrigerators, washing machines, TVs, routers, lighting. Prevents failure to start or power supply burnout due to low voltage.
Recommended: TND1-1 / TND1-1.5
- Households with 1-2 Air Conditioners
Wall-mounted or cabinet air conditioners have high inrush current and may trip or fail to cool under low voltage.
Recommended: TND1-3 / TND1-5
- Gaming Rooms / Home Theaters
PCs, graphics cards, routers, NAS, amplifiers, projectors. Prevents crashes, restarts, and hardware damage from voltage fluctuations.
Recommended: TND1-2 / TND1-3
- Whole-House Regulation
Villas and old houses with unstable incoming voltage, protecting all household devices.
Recommended: TND1-10
- Commercial & Office Applications
- Convenience Stores / Supermarkets / Fresh Stores
Freezers, refrigerated cabinets, cash registers, scanners, LED lighting. Prevents cooling failure and compressor burnout.
Recommended: TND1-3 / TND1-5
- Restaurants / Milk Tea Shops / Bakeries
Ice makers, water boilers, ovens, freezers, POS systems. Voltage instability causes errors and shutdowns.
Recommended: TND1-5 / TND1-10
- Offices / SMEs
Computers, printers, copiers, small servers, switches. Protects against unexpected restarts and damage.
Recommended: TND1-2 / TND1-3
- Internet Cafes / E-sports Hotels
Concentrated power supply for multiple computers and peripherals, requiring high voltage stability.
Recommended: TND1-10 / Three-phase TNS1-9 / 15
- Industrial & Light Production (Mainly Three-phase TNS1)
Suitable for factories, workshops, processing sites with large voltage fluctuations and frequent tripping
- Small Machining
Lathes, drill presses, milling machines, grinders. Prevents motor under-voltage weakness and coil burnout.
- Packaging / Printing / Small Assembly Lines
Sealers, labelers, conveyors. Ensures continuous and stable operation.
- Air Compressors, Pumps, Fans
High inductive load, difficult to start under low voltage; stabilizer required.
- Electronic Factory Testing / Small Equipment
Soldering stations, dispensers, testing instruments. Avoids accuracy issues from voltage fluctuations.
Recommended models:
Low power: TNS1-3 / TNS1-6 / TNS1-9
General use: TNS1-15 / TNS1-20 / TNS1-30
- Weak-Current Security & Network Communications
- Security & Surveillance Systems
Cameras, NVRs, switches, optical modems. Prevents video lag, disconnection, and hard disk damage.
Recommended: TND1-1 / TND1-2
- Community / Building Weak-Current Rooms
Central voltage stabilization for access control, intercoms, turnstiles, and network equipment.
- Small Equipment Rooms / Server Racks
Ensures servers and switches run without disconnection or abnormal restarts.
- Medical & Precision Instrument Applications
- Community Clinics, Dental Practices
Dental units, sterilizers, small testing instruments. Requires high voltage accuracy.
- Beauty / Aesthetic Clinics
Photon machines, laser devices, skin management equipment. Voltage instability causes faults and core component damage.
- Laboratory Precision Instruments
Balances, incubators, small testing devices. Prevents data drift and equipment malfunction.
Recommended: TND1-1 / TND1-2 / TND1-3
- Aricultural & Breeding Applications
- Livestock & Poultry Farming
Temperature fans, cooling pads, incubators, pumps, feeders. Prevents cooling system failure due to low summer voltage.
- Greenhouses
Irrigation pumps, ventilation motors, supplementary lighting. Ensures stable agricultural equipment operation.
- Primary Agricultural Processing
Small crushers, mixers, dryers.
Recommended: TND1-3 / TND1-5 / Three-phase TNS1
- Remote Areas & Temporary Power
- Rural / Mountain / Field Work
Long lines and large voltage drops; essential for pumps, lighting, and tools.
- Construction Site Temporary Power
Temporary lighting, small tools, prefabricated building power.
- Country Homestays & Farmhouses
Concentrated use of electrical appliances across multiple rooms and kitchens.
- Other Typical Small Applications
Hair salons: hair perm machines, heating equipment
Laundries: dry cleaners, dryers, irons
Lottery stations / stationery stores: cash registers, ticket printers, freezers
Garages / near charging points: auxiliary voltage stabilization to protect charging equipment
Simple Selection Rules
Single residential air conditioner: choose TND1-3
Whole house + multiple appliances: choose TND1-5
Shop freezer + cashier: choose TND1-3/5
Small factory three-phase motors: choose TNS1-9/15
