Low-voltage AC circuit protection devices for residential, commercial and industrial electrical systems, including solutions for overcurrent, residual current and surge protection.
Product Category
AC Circuit Protection
Explore UHCCY AC circuit protection solutions for low-voltage power distribution systems. The range covers protective devices designed for overcurrent, residual-current, surge and related electrical protection requirements.
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Product Categories
Automatic Transfer Switch
UHCCY Automatic Transfer Switches (ATS) provide controlled transfer between normal and alternative power sources for low-voltage distribution systems. Choose from compact solutions for residential and distributed power applications to configurations designed for commercial, industrial, generator, solar and energy storage systems.
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UHCCY AC Circuit Protection Products
Browse available models here, then use the comparison table below to compare family-level specifications.
100A / 125A PC-Class Automatic Transfer Switch – UH-PW-AT02
UH-PW-AT02
- Rated Current100A / 125A
- Electrical ClassPC Type
- Pole Configuration2P / 3P / 4P
63A CB-Type Automatic Transfer Switch, 2P / 3P / 4P – UH-PW-AT01
UH-PW-AT01
- Electrical ClassCB Type
- Rated Voltage220V / 380V AC
- Rated Current63A
DIN Rail Automatic Transfer Switch UH-PW-ATQ2-1
UH-PW-ATQ2-1
- Rated Current63 A
- Pole Configuration2P / 4P
- Operating ModeAutomatic / Manual
Dual Power Automatic Transfer Switch 6–63A 2P/4P – UH-PW-ATQ2
UH-PW-ATQ2
- Rated VoltageAC 110 / 220 / 400 V
- Rated Current63 A
- Pole Configuration2P / 4P
Type 1 AC Surge Protective Device 4P 385V – UH-AG-SP01
UH-AG-SP01
- SPD TypeType 1 / T1
- Maximum Continuous Operating Voltage Uc385V AC
- Impulse Discharge Current Iimp25kA
WiFi Smart Circuit Breaker 1–63A with Energy Monitoring – UH-SG-MB01
UH-SG-MB01
- VoltageAC 90–280 V
- Current1–63 A Adjustable
- Energy MeasurementV / A / W / kWh
Overview
About AC Circuit Protection
AC Circuit Protection for Low-Voltage Electrical Systems
AC circuit protection devices help protect electrical installations, conductors, equipment and users against electrical faults that can occur in low-voltage alternating-current systems.
Different protection devices perform different functions. Depending on the circuit design, protection may be required against overload, short circuit, residual current, earth leakage or transient overvoltage.
UHCCY provides AC protection products for residential, commercial and industrial power distribution, with individual product families designed for specific protection functions and installation requirements.
Understanding the Main Protection Functions
Overcurrent Protection
Overcurrent protection is used to disconnect a circuit when excessive current results from an overload or short circuit. Circuit breakers designed for this purpose must be selected according to rated current, breaking capacity, operating characteristics and the electrical system.
Residual-Current Protection
Residual-current devices detect current imbalance associated with leakage to earth. Depending on the device type, residual-current protection may be provided independently or combined with overload and short-circuit protection.
For example, an RCCB primarily provides residual-current protection, while an RCBO combines residual-current and overcurrent protection in one device.
Surge Protection
Surge protective devices help limit transient overvoltage caused by switching events, lightning-related disturbances and other electrical transients.
SPD selection depends on the electrical system, installation location, earthing arrangement and applicable surge protection requirements.
Choose the Product Family First
Each AC protection device has a different function and should not be treated as interchangeable.
Start by identifying the protection required by the circuit, then open the corresponding UHCCY product category to compare available models, ratings and technical specifications.
Detailed selection criteria, model comparisons and installation information are provided on the relevant product-family and individual product pages.
Key Advantages
Why Choose UHCCY AC Circuit Protection
Reliable Circuit Protection
Solutions for common low-voltage AC protection requirements including overload, short-circuit, residual-current and transient overvoltage protection.
Multiple Protection Functions
Different product families allow protection functions to be selected according to circuit architecture and application requirements.
Flexible System Integration
Suitable for residential distribution boards, commercial electrical systems, industrial panels and OEM equipment.
Modular Product Options
A broad range of ratings, pole configurations and device formats supports different low-voltage distribution applications.
Standards-Oriented Design
Products are developed according to the applicable standards and technical requirements of their individual product families.
OEM & B2B Support
UHCCY supports distributors, panel builders and equipment manufacturers with product selection, branding, packaging and project requirements.
Use Cases
AC Circuit Protection Applications
Commercial Buildings
Protection, switching, distribution and enclosure components for commercial and light-industrial electrical installations.
Industrial Power Distribution
Residential Electrical
Protection, switching and backup-power components for residential distribution boards and low-voltage electrical systems.
Solar Inverters
Compliance
Certifications & Standards
Applicable standards depend on the protection function and individual product family.
Common international standards for low-voltage AC circuit protection include:
- IEC 60898-1 — circuit breakers for overcurrent protection in household and similar installations;
- IEC 60947-2 — circuit breakers used in low-voltage switchgear and controlgear applications;
- IEC 61008-1 — residual current operated circuit-breakers without integral overcurrent protection;
- IEC 61009-1 — residual current operated circuit-breakers with integral overcurrent protection;
- IEC 61643-11 — surge protective devices for low-voltage AC power systems.
The applicable standard, certification and approval scope must be verified for the individual UHCCY product and model.
Certifications should not be assumed to apply to every product within the AC Circuit Protection category. For project or regulatory requirements, refer to the individual product documentation or contact UHCCY for model-specific information.
FAQ
Frequently Asked Questions
Common technical and purchasing questions about this product category.
What is AC circuit protection?
AC circuit protection refers to devices used to detect and interrupt electrical faults or limit abnormal electrical conditions in alternating-current systems. Different devices protect against conditions such as overload, short circuit, residual current and transient overvoltage.
What types of AC circuit protection devices are available?
Common protection devices include circuit breakers, residual-current devices, combined residual-current and overcurrent protective devices, and surge protective devices. The exact UHCCY range is organized into separate product categories according to protection function.
What is the difference between an MCB, RCCB and RCBO?
An MCB primarily protects against overload and short circuit. An RCCB provides residual-current protection, while an RCBO combines residual-current protection with overload and short-circuit protection.
How do I choose the correct AC protection device?
First determine which electrical fault or condition must be protected against. Then consider system voltage, rated current, number of poles, breaking capacity, residual-current requirements and applicable standards. Exact selection criteria should be checked on the relevant product-family page.
Are all UHCCY AC protection products certified to the same standards?
No. Applicable standards and certification scope vary by product type and model. Always verify the documentation for the specific product required for the project.
Need Reliable AC Circuit Protection?
Contact UHCCY for model selection, technical specifications, OEM/ODM requirements, samples, and quotations.