Disconnector (Isolator)
Your Leading Disconnector (Isolator) Supplier
Trust In Grid Co., Ltd. is a professional transformer manufacturer, specializing in the design and production of power transformer, high-voltage switchgear, power distribution equipment, energy storage systems (ESS), magnetic wire, bushing and machining parts. Our power transformers are available in 500KV, 330KV, 220KV, and 110KV models, and are widely used in power utilities, renewable energy systems (solar and wind), industrial facilities, data centers, transportation infrastructure, and OEM applications.
Why Choose Us?
Production Capacity
With 6 factories covering 240,000 m², over 2,000 employees, and 200+ engineers, we support large-scale projects and long-term global supply with more than 30 years of export experience.
Advanced Equipment
We operate a complete set of in-house production equipment, including cutting, winding, CNC machining, vacuum drying, and testing systems, with over 450 machines ensuring stable quality and efficient output.
Quality Control
All products are manufactured and tested in compliance with IEC, IEEE, ANSI, CSA, UL/cUL, CE, and ISO 9001:2015 standards, ensuring reliable performance and smooth international approval.
OEM & ODM Capability
Our engineering team provides OEM/ODM support, including customized design and technical optimization, delivering tailored solutions for utility, industrial, and renewable energy projects.
Technical Specifications of Disconnector (Isolator)
|
Model |
Rated Voltage (kV) |
Rated Current (A) |
Rated Short-time Withstand Current (kA), 4s |
Rated Peak Withstand Current (kA) |
|
GN19-10(C)400-12.5 |
12 |
400 |
12.5 |
31.5 |
|
GN19-10(C)630-20 |
12 |
630 |
20 |
50 |
|
GN19-10(C)1000-31.5 |
12 |
1000 |
31.5 |
80 |
|
GN19-10(C)1250-40 |
12 |
1250 |
40 |
100 |
Advantages of Disconnector (Isolator)
Enhance Safety
The visible gap gives you peace of mind that the power is truly off.
Easy to Use
They are easy to operate, usually with a clear handle or lever.
Reliable
They are built tough and can handle frequent use.
Compact Design
Two functions switching and disconnecting into one device makes it compact.
Clear & Visible Isolation
• Switch Disconnector: Provides a visible and positive break of the circuit (I-0 positions clearly indicated). Operators can see and confirm that the circuit is safely isolated before maintenance.
• MCB: Breaks internally; no visible isolation. Even in OFF position, uncertainty may exist about complete disconnection.
Knife-Type Contact Advantage
• Switch Disconnector: Uses robust knife-type contacts, creating a wide, visible air gap. This ensures reliable isolation, superior arc suppression, and long-term durability under DC stress.
• MCB: Relies on spring-loaded contacts inside an enclosed mechanism. No visible gap, higher wear, and less confidence in isolation at higher DC voltages.
No Risk of Nuisance Trips
• Switch Disconnector: Purely mechanical — Isolates only when you decide. Eliminates false trips, which can compromise safety during critical operations.
• MCB: Sensitive to fluctuations, harmonics, or surge events → Risk of nuisance tripping → unplanned downtime or even unsafe shutdown.
Arc-Safe Operation
• Switch Disconnector: Designed with arc chambers & extinguishing paths suitable for high DC voltages. Operator safety ensured by isolating circuit under controlled conditions.
• MCB: Arc quenching in DC is more difficult (longer arc length vs AC). At higher voltages (like 1000V DC), MCBs struggle, which can lead to unsafe arc propagation.
System Safety Compliance
• Switch Disconnector: Complies with IEC 60947-3, specifically tested for isolation, making it a true disconnector (safe for maintenance and service).
• MCB: Complies with IEC 60898/60947-2, primarily a protection device, not validated for isolation.
Operator Safety During Maintenance
• Switch Disconnector: Lockable handle options prevent accidental re-energization. Enhances safety for technicians working on panels.
• MCB: Cannot always be lockable; risk of accidental ON during service
Designed for Harsh DC Applications
• Switch Disconnector: Built for solar PV, battery storage, and EV systems with high DC voltage and current stresses.
• MCB: Originally designed for AC; adapted to DC but with limitations at higher voltages, making them less safe in demanding DC networks.
Application Scope of Disconnector (Isolator)
Industrial installations
At the head of switchboards, to isolate motor feeders and production lines.
Commercial and tertiary buildings
As main disconnectors for distribution boards.
Photovoltaic installations
To disconnect DC current on the panel or inverter side.
Some residential applications
As emergency disconnects or for specific circuit isolation.
How to Choose Disconnector (Isolator)
Current Capacity
Ensuring the disconnector can handle the required load without overheating or failing.
Pole Count
Determining the number of poles needed for the application (e.g., 3-pole for three-phase systems, 4-pole for systems requiring a neutral connection).
Operation Frequency
Considering how often the switch will be operated under load conditions.
Safety Features (On load operation)
Ensuring the switch can safely operate under load, preventing arcing and equipment damage.
Customization Options
Material: Customizable
Logo: Customizable
Structure: Customizable
MOQ: Customizable
Ordering Process
Send Us Inquiry → Receive Our Quotation → Negotiate Details → Confirm the Sample → Sign Contract/Deposit → Mass Production →Cargo Ready → Balance/Delivery → Further Cooperation
Payment Terms
T.T with 30% downpayment, 70%before shipment.
Paypal or West Union also accept.
Our Service Highlights
Pre-Sales Consultation & Design Support
Early technical engagement to define requirements and deliver optimized solutions.
During Sales & Project Execution
Transparent project management with controlled production, quality tracking, and on-time delivery.
Warranty Advantage
Minimum 2-year warranty on all products, ensuring reliable and risk-free operation.
After-Sales Support
24/7 technical support with fast response, spare parts availability, and training services.
Long-Term Partnership
Lifelong technical support and upgrade guidance for sustained performance.
Packaging & Shipping
Packaging details:
Shockproof foam/moisture-proof film, professional export cartons/wooden crates/pallets.
Final assembly ensures mechanical integrity and readiness for transportation and installation.
Certificates
We're well-known as one of the leading disconnector (isolator) manufacturers and suppliers in China, also support customized service. Please feel free to buy high quality disconnector (isolator) made in China here from our factory. Contact us for more details.
GW4 40 5 Outdoor High Voltage AC Disconnector, GW4 252 Outdoor High Voltage AC Disconnector, GW4 72 5 126 Outdoor High Voltage AC Disconnector