LT-SSD Series SPD Disconnector & External Disconnect Switch
A disconnector switch that enables visible isolation to facilitate SPD maintenance while providing additional overcurrent protection for the SPD. Leitai Electric is a surge protective device manufacturer based in China, focusing on in-house production, testing, and quality control of surge protective devices of Type 1, Type 2, and Type 3.
Applications & circuit protection
The LT-SSD50X / SSD80 / SSD160 is utilized as an external disconnector / backup protection switch for surge protection devices. Disconnection of the SPD from the circuit occurs upon failure.
The following are the typical applications of this device.
- SPD back up: External disconnection for SPD protection.
- Switchboards: Visible isolation for maintenance.
- Fault protection: Overcurrent protection backup.
- Retrofit: External disconnector fitted on existing SPDs.
Schematic Diagram
The diagram depicted above presents a depiction of the surge protection devices named LT-SSD50X/ SSD80/ SSD160 and their connection methods.
Construction & operating reliability
The LT-SSD50X/ SSD80/ SSD160 device incorporates both the use of high-energy MOV elements and an internal thermal disconnector providing high resistance to clamping and an extended lifespan. When used in production, these factories handle everything from MOV classification, construction, thermal connection, and testing without leaving customers in the dark about the production of surge protective devices.
- Use of high-energy metal oxide varistor (MOV) to provide quick response.
- Internal thermal disconnector equipped with a failure indicator.
- IP20 housing with UL94 V0 flame proof capability.
- Complies with both IEC 61643-11 and GB/T 18802.11 standards.
SPD Disconnector Technical Specification & Selection Guide
| Technical Data | Value |
|---|---|
| Uc | 440V |
| Iimp | 30kA |
| It | 3A |
| Isccr | 25000A |
| ta | 100ns |
Where to Buy SPD Disconnector at Factory Sales Prices
The pricing for the LT-SSD50X / SSD80 / SSD160 is dependent on your specifications, types of models, the capacity of discharge, the voltage, and the quantity of order. Factory pricing is applicable for all the large quantity orders, OEM, and project orders.
- Standard classifications are quote from the factory price list
- Custom configurations are given for the prices
- Written quote is given as per the above specifications
How to Install and Connect SPD Disconnector
Positions LT-SSD50X / SSD80 / SSD160 on 35mm DIN rail near the panel or equipment to be protected. The SPD is connected in parallel, observe terminal markings of the housing and following wiring diagram from documentation.
- Parallel connection with minimal length of leads to PE terminal.
- Exterior isolator as per specification.
- Wiring diagram is included in the product documentation.
Wiring Diagram
The circuit diagram above illustrates the preferred way of wiring the LT-SSD50X / SSD80 / SSD160 in a standard distribution board, with all the terminals corresponding to the common convention for marking L, N and PE.
SPD Disconnector Comparison Guide: Choose the Right Option
While choosing a surge protective device for your installation you will mostly be safe going for a Type 2 SPD when installing it in a distribution board, although in the case of direct lightning strikes other types of SPDs, like Type 1 or Type 1+2, should be selected.
| Feature | This SPD | Alternative |
| Type | SPD External Disconnector | Other SPD types available |
| Discharge capacity | Per specification / 30kA | Matched to network duty |
| Protection level | Per specification | Lower Up options available |
| Application | External Disconnect | Other installation types |
Export Markets & Country Compatibility
Leitai surge protective devices are used in projects in over 40 countries worldwide, with full certification and documentation according to local market requirements.
SPD Dimensions, Weight & Packing
The LT-SSD50X / SSD80 / SSD160 is highly efficient and is specifically designed to be attached on load discharge of control boxes. This makes the product very simple to use as there are no rigorous instructions and the installation can be easily performed without wasting time.
- Installation can be done simply
- All parts of the model are well protected during shipment
- Dimension drawing included
Dimensional Drawing
The above dimensional sketch illustrates the mounting outline of LT-SSD50X / SSD80 / SSD160 needed for installation on DIN rail and regarding panel layout design.
Standards & certifications
The surge protector LT-SSD50X / SSD80 / SSD160 follows the requirements from IEC 61643-11 / GB/T 18802.11, and upon requirements of any project or destination market, reports and records of type testing and routine test results can be provided.
- Standard: IEC 61643-11 / GB/T 18802.11.
- Certifications: CE (per model).
- Marking of terminals and polarity is done as per standard.
- Suitable for DIN rail mounting in distribution panels.
OEM & B2B supply support
We offer OEM, distribution and wholesale programmes for the SPDs and custom marking, packaging and branding.
If LT-SSD50X/SSD80/SSD160 configurations are unsuitable for your project, send us the required specifications such as types, capacity, voltage and quantity of SPDs so that our export department can prepare the quotation for you based on your specifications with terms confirmed with the order.
- Product samples are available for evaluation.
- Flexible quantities can be provided for any project and B2B purchase.
- We can provide OEM and ODM for suitable projects.
- We can offer marking, branding and packaging options.
- Technical documentation and certification support is available.
SPD Disconnector Buyer FAQ: What You Need to Know
What is the trip current?
A trip current is where an SPD will trip if it encounters a fault or some type of malfunction. The disconnector will trip at its power frequency current level, i.e. 3A, and will successfully disconnect the damaged SPD.
What is an SPD disconnector?
An SPD disconnector is an external protective device that ensures proper disconnection of an SPD at the end of its life or when there is a malfunction. It adds a level of visible disconnecting during maintenance work is being performed.
Can I get OEM supply?
Yes, Leitai offers the OEM service and bespoke packaging of disconnectors and SPDs.
Do all SPDs need an external disconnector?
Not necessarily, as most of the SPDs would have an inbuilt thermal disconnector. However, in order to add extra reliable protection, the use of a disconnector may be advisable.
Where is the LT-SSD50X / SSD80 / SSD160 installed?
The disconnector is placed in a series in front of the surge protective device and is mounted on the DIN rail of the distribution board.
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