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Low-voltage electrical components
Low-voltage electrical components
Low-voltage electrical components are essential devices used in circuits with voltages below 1200V (AC) or 1500V (DC). These include circuit breakers, contactors, isolators, dual power supplies, current transformers, inverters, soft starters, relays, buttons, indicator lights, and more. Widely used in electrical substation components and industrial applications, they play a critical role in enabling circuit connection and disconnection, protecting, controlling, and regulating electrical systems.
Key Features:
Low-voltage electrical components feature low rated voltage, safety and reliability, as well as compact structure. They generally possess protection functions such as overload, short circuit, leakage, and overvoltage. They are easy to operate and respond quickly. At the same time, they have strong versatility, simple installation and maintenance, and can be adapted to various distribution and control circuits. They can stably achieve the on-off, protection, control and monitoring of circuits, meeting the distribution safety and automation operation requirements in industrial, construction and civilian scenarios.
Why choose low-voltage electrical components
Low-voltage electrical components are the backbone of power distribution and control systems, offering reliable performance in power substations and beyond. They facilitate circuit switching, load protection, and precise regulation, meeting the stringent demands of modern power networks. Our range includes top brands like Schneider, ABB, Siemens, Chint, and Delixi, ensuring high-quality products for every application. Whether in distribution or control systems, these components adapt to various conditions, providing the efficiency and reliability required in industrial and commercial settings. These components are commonly used in industrial machinery, electrical substations, and other essential equipment, supporting both conventional and innovative systems. Despite advancements in electronics, their continued development ensures they remain a vital part of modern electrical systems.
Product Advantages
Versatile Applications: Low-voltage electrical components are indispensable in power distribution and control systems, with broad uses in switchgear components for industrial, residential, and commercial sectors.
Wide Variety: From circuit breakers to relays, these components meet diverse operational needs, ensuring compatibility with numerous low-voltage systems.
Reliable Performance: Designed for high switching frequency and long service life, these components guarantee stable and accurate operation, even in demanding environments.
Adaptability and Innovation: New technologies improve performance and expand applications, including integration with smart systems, ensuring relevance in evolving electrical systems.
Operating Conditions
Ambient Temperature: Normally operates properly within the range of -5℃ to +40℃.
Altitude: Usually not exceeding 2000m. Plateau-type products should be selected for high-altitude areas.
Installation Environment: Suitable for places without severe vibration, flammable or explosive hazards, and corrosive gases.
Humidity and Cleanliness: The environment should have moderate relative humidity, with no condensation and no excessive dust.
Site Ventilation: The installation site should be well ventilated, avoiding direct sunlight and direct rain exposure.
Application
Low-voltage electrical components are mainly applied in scenarios such as building power distribution, industrial equipment, infrastructure and civil facilities. They are widely used in various low-voltage distribution cabinets, distribution boxes, and motor control circuits, performing functions such as circuit opening and closing, protection, control and monitoring. They are commonly found in factory production lines, shopping malls and buildings, residential communities, data centers, infrastructure and various mechanical and electrical equipment, providing a safe and stable operation guarantee for the low-voltage power supply system.
Low-Voltage Component Selection Table
Technical Parameters
Grapnic Symbols
Low-Voltage Component Selection Table
Low-Voltage Component Selection Table for Direct-On-Line Starting of 3-Phase 380V Motors
| Motor Power (kW) | Rated Current Ie (A) | Rated Current of D-Type Circuit Breaker (A) | Rated Current of AC-3 Contactor (A) | Adjustment Range of Thermal Relay (A) |
|---|---|---|---|---|
| 0.37 | 0.75 | 6 | 9 | 0.63–1 |
| 0.55 | 1.1 | 10 | 9 | 1–1.6 |
| 0.75 | 1.5 | 10 | 12 | 1.2–2 |
| 1.1 | 2.3 | 10 | 12 | 1.6–2.5 |
| 1.5 | 3 | 10 | 12 | 2–3.2 |
| 2.2 | 4.3 | 16 | 18 | 2.8–4.5 |
| 3 | 6.4 | 16 | 18 | 4–6 |
| 4 | 8.6 | 16 | 25 | 5.5–8 |
| 5.5 | 11.5 | 20 | 25 | 8–12 |
| 7.5 | 15 | 25 | 32 | 12–18 |
| 11 | 22 | 32 | 32 | 18–26 |
| 15 | 30 | 40 | 40 | 26–36 |
| 18.5 | 37 | 63 | 50 | 32–40 |
| 22 | 44 | 63 | 65 | 40–50 |
| 30 | 60 | 80 | 80 | 50–70 |
| 37 | 74 | 100 | 95 | 63–80 |
| 45 | 90 | 125 | 110 | 75–100 |
| 55 | 110 | 160 | 150 | 90–120 |
| 75 | 140 | 200 | 185 | 120–150 |
| 90 | 170 | 250 | 225 | 140–180 |
| 110 | 210 | 315 | 265 | 170–220 |
| 132 | 250 | 350 | 300 | 200–250 |
| 160 | 300 | 400 | 370 | 240–300 |
| 200 | 360 | 500 | 410 | 300–360 |
| 250 | 430 | 630 | 500 | 360–450 |
Applicable under the AC-3 utilization category for standard fans and water pumps,
with a maximum switching frequency of ≤30 operations per hour.
Basic Selection Rules
- Motor rated current:
For simple estimation, 1 kW ≈ 2 A. - Circuit breaker:
Use a D-type power circuit breaker with a rated current approximately
1.5 times the motor’s rated current for short-circuit protection. - AC contactor:
Select an AC-3 contactor with a rated current ≥1.5 times the motor current.
Increase this to approximately 1.8 times for frequent starting. - Thermal overload relay:
Its adjustment range must cover the motor’s rated current. During operation,
set it to approximately 0.95–1.05 times the rated current. - Working-condition correction:
For heavy loads, frequent jogging, or long cable runs,
upgrade all components by one standard size.
Technical Parameters
Summary Table of Electrical Component Letter Symbols
| Letter Symbol | Component Name | Letter Symbol | Component Name |
|---|---|---|---|
| B | Transducer, Sensor | Q | Power Switching Device |
| C | Capacitor | QA | Automatic Switch |
| FU | Fuse | QF | Circuit Breaker |
| G | Generator, Power Supply | QS | Disconnector / Isolating Switch |
| HL | Indicator Light | R | Resistor |
| HA | Acoustic Alarm | S | Switching Device |
| K | Relay, Contactor | SA | Selector Switch |
| KA | Auxiliary Relay | SB | Push Button |
| KD | Differential Relay | T | Transformer |
| KG | Static Relay | TA | Current Transformer (CT) |
| KM | Contactor | TV | Voltage Transformer (VT/PT) |
| KT | Time Relay | UC | Converter |
| KV | Voltage Relay | UI | Inverter |
| L | Inductor, Reactor | UR | Rectifier |
| M | Motor | UF | Frequency Converter |
| PA | Ammeter | X | Terminal, Plug, Socket |
| PJ | Watt-hour Meter | XB | Junction Box |
| PP | Wattmeter | XS | Socket |
| PV | Voltmeter |
Grapnic Symbols
Custom Low Voltage Electrical Components Solutions
(The values can be customized according to project requirements.)
If you have specific requirements for the low voltage electrical components, please contact us. Our team will review your application needs and provide a tailored solution.
We can customize rated voltage, current capacity, component type, protection requirements, and other key parameters to ensure reliable performance and safe operation in your power system. Zoliov low voltage electrical components are suitable for distribution cabinets, control panels, industrial equipment, commercial buildings, and other low-voltage electrical projects where safety, stability, and long-term reliability are required.
FAQ
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