LDSP1s-B60 Type 2 AC Surge Protective Device, In 30kA / Imax 60kA

Product Overview

The LDSP1s-B60 is a pluggable Type 2 AC surge protective device designed to limit transient overvoltages in low-voltage power distribution systems.

With a nominal discharge current of 30 kA and a maximum discharge current of 60 kA under an 8/20 μs waveform, it is suitable for distribution boards, commercial electrical panels, and industrial control cabinets exposed to indirect lightning effects and switching transients.

The series is available with maximum continuous operating voltage ratings of 275 V, 320 V, 385 V and 440 V AC. This allows the SPD to be selected according to the actual system voltage, temporary overvoltage conditions and required voltage protection level.

During normal operation, the MOV-based protection elements remain in a high-impedance state. When a short-duration overvoltage occurs, the SPD provides a discharge path that helps limit the transient voltage reaching connected electrical and electronic equipment.

The pluggable design, internal thermal disconnector and green/red status window make inspection and maintenance more straightforward. Optional remote signalling is also available for monitored panels and unattended electrical installations.

Product features

1. Type 2 AC surge protection

Designed for low-voltage AC distribution systems, with In 30 kA and Imax 60 kA under an 8/20 μs current waveform.

2. Four Uc voltage options

Available in 275 V, 320 V, 385 V and 440 V AC versions for different system-voltage and protection requirements.

3. MOV voltage-limiting technology

The MOV-based protective circuit responds quickly to transient overvoltages while maintaining a low residual-voltage design.

4. Pluggable protection modules

The protective cartridge can be removed from the wired base for inspection or replacement without necessarily rewiring the entire SPD assembly.

5. Internal thermal disconnection

An integrated thermal disconnector isolates the protective element if an abnormal thermal condition develops.

6. Green/red visual status indication

Green indicates normal operating condition. Red means the protection module should be inspected and replaced.

7. Optional remote signalling

An optional remote contact allows the SPD condition to be connected to an alarm, control panel or building monitoring system.

8. Multiple protection configurations

The series includes 1+0, 2+0, 3+0, 4+0, 1+1 and 3+1 variants for different conductor and protection arrangements.

9. Standard DIN-rail mounting

The compact modular housing is designed for installation on a standard 35 mm DIN rail inside a suitable electrical enclosure.

10. OEM support

Product branding, labels, packaging, manuals and supporting technical documents can be prepared for qualified OEM projects.

  

Model Selection Note

The correct Uc rating and protection configuration should be selected according to the actual AC system voltage, conductor arrangement, earthing design and required protection path.

A higher Uc rating is not automatically the better choice. The SPD must remain stable under normal voltage conditions while providing a voltage protection level suitable for the equipment being protected.

If you are unsure which model to use, send us the nominal system voltage, earthing arrangement and electrical single-line diagram.

Product details

FAQ

1. What does Imax 60 kA mean on this AC SPD?
Q: Imax is the maximum discharge current that the SPD is designed to handle under the specified 8/20 μs test waveform.

For the LDSP1s-B60, Imax is 60 kA per protection path. It is a surge-current rating, not the normal operating current of the electrical circuit.

2. What is the difference between In 30 kA and Imax 60 kA?
Q:

In is the nominal discharge current used to describe the SPD’s Type 2 surge-current performance. For this series, In is 30 kA.

Imax is the higher maximum discharge-current test value. For the LDSP1s-B60, it is 60 kA.

Put simply, In is the nominal rating, while Imax is the maximum specified 8/20 μs discharge-current value.

3. What are the Up values for the different models?
Q:  The specified voltage protection levels are:

275 V model: Up ≤1.8 kV

320 V model: Up ≤2.0 kV

385 V model: Up ≤2.2 kV

440 V model: Up ≤2.4 kV

Up is the residual voltage specified across the SPD under definesurge-test conditions. The SPD does not reduce the surge voltage to zero; it limits it to a controlled level.

4. Where should a Type 2 AC SPD be installed?
A Type 2 AC SPD is commonly installed in a distribution board, sub-distribution panel or industrial control cabinet where protection against residual surges, induced lightning effects and switching transients is required.

The final installation point depends on the complete surge protection design, cable lengths and whether upstream Type 1 protection is already installed.

5. What do the green and red status indicators mean?
Q: Green indicates that the protection module is in its normal operating condition.

Red means the module is no longer providing the intended surge-protection function and should be inspected and replaced by qualified personnel.

The status window should be checked during routine maintenance and after a significant surge event.

6. How many years has your company made this kind of equipment?

Q:Our company has a history of 12 years. We have been specializing in the production of a series of electrical products such as surge protectors, fuses, circuit breakers, etc.

7. Which certificate do you have for your equipment?

Q: We have established a complete quality management, supply chain and after-sales service system. Continuously introduce 6S international advanced concepts in management, and have successively passed ISO9001, ISO14001, OHSAS18001, CQC certification, CE certification, TUV certification, CB certification, RoHS certification.

8. How many staff do you have in your factory?

Q:Our company is located in Jiujiang Economic and Technological Development Zone, Jiujiang City, Jiangxi Province, the only International trade port city in Jiangxi Province, with a plant area of more than 30,000 square meters and more than 200 employees.

9. How can I become your agent in my country?

Q: We welcome distributors in various countries to cooperate with us. Sales is an important assessment criterion. According to the different requirements of different countries, new and old customers are welcome to consult!

10. Do you have a detailed and professional installation manual?

Q:Of course, you can find the installation manual of any product on our website, and there will be an installation manual in our product box.

11.If OEM is acceptable?
Q:We can provide OEM and ODM services. We have many different specifications and appearances for custom.