Manufacturer of residual current devices

WEISHO, as a leading manufacturer of residual current devices (RCDs) in the market, not only creates high-quality products through strict production processes, but also offers highly competitive prices leveraging its complete supply chain advantages. At the same time, we support OEM manufacturing and personalized customization services to help customers enhance their brand competitiveness and market value.

What are our characteristics

Production technology

Adopting industry-leading manufacturing processes, continuously optimizing production processes, and improving efficiency and accuracy

Customization and OEM/ODM

Supports OEM/ODM services and can provide customized solutions according to your needs, including rated current, brand identification, etc

High performance-price ratio

Efficient production and strong supply chain management ensure high quality and low prices, reducing customer procurement costs

Long term partnership

Putting customers at the center, establishing long-term stable cooperation, and assisting in the growth of customer business.

Customizable residual current devices

Explore our extensive range of customized residual current devices (RCDs), suitable for various power distribution scenarios and professional applications. We provide comprehensive solutions from basic leakage protection to intelligent safety control:

63A industrial residual current device

Fixed-frame residual current device

Universal residual current device

Wholesale residual current device

A brief introduction

WHY CHOOSE US

Industry-leading testing: Every residual current device (RCD) undergoes 100% strict testing in line with international safety standards (e.g., residual current sensitivity, tripping response time), ensuring compliance with safety norms.
High-quality materials: Premium components (flame-retardant housing, stable current transformers) extend the RCD’s service life and guarantee consistent leakage protection performance.
Engineering Innovation: Our R&D team continuously optimizes RCD technology—such as enhancing residual current detection accuracy and shortening tripping time—to improve electrical safety protection.
Global certification: Our entire RCD series has obtained IEC, CE, UL, and regional safety certifications, meeting the access requirements of markets worldwide.
Comprehensive support: We provide end-to-end services from RCD selection guidance (matching models to application scenarios) to installation training and after-sales maintenance support.

Why choose a residual current device?

Residual current devices (RCDs) are core components in modern electrical systems, specializing in leakage protection (alongside basic overload and short-circuit defense). They deliver reliable performance across residential, commercial, and light industrial scenarios—prioritizing electrical safety by isolating faulty circuits quickly. Here’s why RCDs are the smart choice for your electrical safety needs.

Efficient Overload Protection

RCDs provide robust protection against electrical leakage (the primary cause of electric shocks) and overloads, shielding electrical systems and users from potential harm.

Advanced security features

Residual current devices (RCDs) are equipped with advanced safety features that effectively reduce electrical accidents and enhance user protection.

Versatile Applications

Residual current devices (RCDs) are adaptable to diverse scenarios, serving as a flexible safety solution for various electrical systems.

Cost-Effective Solution

Investing in residual current devices (RCDs) helps cut long-term maintenance and replacement costs, thanks to their robust design and extended service life.

The advantages of our RCD product

High arc extinguishing capability

Quickly suppresses and splits arcs generated during tripping, shortening arc duration and reducing arc energy—suitable for scenarios with frequent circuit switching.

Intelligent functions

Compatible with smart monitoring systems, supporting remote leakage fault monitoring, real-time status diagnosis, and early warning prompts—improving the operational efficiency of electrical safety management.

Long mechanical lifespan

Adopts wear-resistant materials and optimized structural design; mechanical service life reaches 40,000+ switching cycles, far exceeding the service life of conventional residual current devices.

Low maintenance cost

Oil-free maintenance design with simplified internal structure, reducing maintenance frequency and lowering long-term operation and upkeep costs.

High judgement ability

Boasts high residual current detection accuracy (minimum 5mA sensitivity) and stable tripping performance, meeting the safety protection needs of high-sensitivity scenarios.

Brand reputation

Certified by authoritative bodies (ISO, IEC, UL, etc.), widely used in global residential, commercial, and industrial markets—backed by reliable product quality and comprehensive after-sales support.

Get Your Customized Quotation!

We provide customized solutions. Tell us your needs for a precise quote.

Not just a residual current device manufacturer

We don’t just produce residual current devices (RCDs)—we also offer a range of customized value-added services to meet your project needs. We are committed to pursuing excellence, ensuring that every customer receives personalized attention, expert guidance (e.g., RCD model matching, scenario-based safety solutions), and seamless support throughout the entire process of cooperation.

Service Consultation

Whether your residual current device (RCD) needs are for basic applications or complex projects, our team provides professional advice and technical consultation. For high-difficulty projects, we offer in-depth engineering support—ensuring you select the optimal RCD products and application solutions.

Product Recommendations

Not sure which RCD fits your system? Our experts will provide free customized advice based on your specific operational and environmental requirements, helping you get the product that best meets your electrical leakage/overload protection needs.

Logistics Support

If you lack a reliable freight forwarder, we can arrange free transportation of RCDs from our factory to your project site. Our logistics team ensures timely, safe delivery—keeping your project on schedule and minimizing downtime.

Installation Support

We provide guidance for RCD installation (e.g., wiring, residual current parameter configuration). Our technical team helps ensure correct, compliant installation to maximize RCD safety performance.

What are our clients saying

Don’t just believe what we say! Take a look at satisfied customers’ evaluations of our residual current devices (RCDs).

“These RCDs have significantly boosted the safety of our industrial electrical installations—their leakage protection response is precise and reliable, effectively reducing electric shock risks for on-site personnel.”

John Doe

Electrical Engineer

“The RCDs are really user-friendly; they’re easy to integrate into home circuits, and I feel much more reassured using electrical appliances in wet areas like the bathroom.”

Tom Johnson

Homeowner

“I trust these RCDs for their durability—they’ve held up perfectly in my home renovation projects, and the test button makes it easy to verify their function regularly.”

James Brown

DIY Enthusiast

“Since switching to these RCDs, our facility’s electrical fire risks have dropped noticeably, and maintenance costs have decreased thanks to their long service life.”

Maria Smith

Facilities Manager

WEISHO employs the most advanced production equipment and precise testing methods at all times, providing a solid guarantee for the company’s product manufacturing and quality inspection.

All products of the entire series have undergone strict environmental and electrical tests.

At the same time, the company has obtained ISO9001 quality management system and ISO14001 environmental management system certifications.

♥Wide selection
♥OEM Quality
♥100% Satisfaction Guarantee

Looking forward to working with you

Your trusted electrical equipment supplier

FAQ

Learn more about residual current devices (RCDs) through these frequently asked questions.

What is a residual current device?

An RCD is a low-voltage electrical safety device that monitors the current imbalance (residual current) between live and neutral wires. It quickly trips to cut off power when leakage occurs (e.g., human electric shock, insulation damage), preventing electrical accidents. It’s a core component for electrical safety in residential, commercial, and light industrial scenarios.

How do residual current devices work?

RCDs use a current transformer to detect the vector sum of live/neutral currents: under normal conditions, the sum is 0. When leakage happens (e.g., current flows to the ground), the sum exceeds the set threshold (typically 30mA for personal protection), triggering an electromagnetic or electronic mechanism to trip the circuit within ≤0.1 seconds—stopping electric shock risks.

Why use residual current devices

Traditional circuit breakers only protect against overload/short-circuit, but RCDs add leakage protection (the leading cause of electrical shocks and fires). They are mandatory in most regions for residential circuits, as they significantly reduce electric shock and fire risks, especially in wet environments (bathrooms, kitchens).

What are the components of an RCD?

Key components include: a current transformer (leakage detection core), a tripping mechanism (electromagnetic/electronic), main contacts (for circuit switching), an operating handle, a test button (to verify leakage protection), and a flame-retardant housing.

How often should RCDs be tested?

It’s recommended to press the “TEST” button monthly to verify leakage protection function. For commercial/industrial applications, professional functional testing (including residual current sensitivity verification) should be conducted annually. High-frequency use scenarios (e.g., workshops) may require semi-annual testing.

Can RCDs be used in residential applications?

Yes—RCDs (or RCBOs, which integrate RCD and overload/short-circuit protection) are essential for residential circuits. Typical configurations use 30mA RCDs for sockets (especially wet areas) and 100mA RCDs for main circuits, ensuring home electrical safety.

What maintenance do RCDs require?

RCDs have no consumable parts and require minimal maintenance: keep the device clean (avoid dust/moisture), press the test button monthly, and replace the device if it fails the test (or if tripping becomes slow). Do not disassemble—professional replacement is recommended for faults.

Are RCDs environmentally friendly?

Modern RCDs use RoHS-compliant materials (free of lead, mercury, etc.) and are recyclable (metal contacts, plastic housing). Their 10–15 year service life reduces waste from frequent replacements, and they prevent electrical fires (indirectly reducing fire-related pollution).

What sizes do RCDs come in?

RCDs are sized by residual current rating (30mA, 100mA, 300mA) and rated current (16A, 20A, 32A, 63A). Physical sizes follow standard electrical panel dimensions (e.g., 1-module, 2-module for residential RCBOs), ensuring compatibility with distribution boxes.

Do RCDs have a warranty?

Most manufacturers provide a 1–2 year warranty covering material/workmanship defects. Some brands offer extended warranties (up to 5 years) for commercial bulk orders. The warranty does not cover damage from improper use (e.g., overloading beyond rated current).