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Surge Protector Device (SPD)
SPD
The Htst1-c series surge protector (SPD) is designed for AC 50/60Hz, 380V and below power systems including TT, IT,...
Product Overview
What This Model Does
The Htst1-c series surge protector (SPD) is designed for AC 50/60Hz, 380V and below power systems including TT, IT, TN-S, and TN-C-S. It is suitable for LPZ1, LPZ2, and LPZ3 zones and installs on a 35mm electrical guide rail. Built to IEC61643-1 and GB18802.1, it provides voltage-limiting protection with an integrated disconnector that automatically isolates the device during overheating or breakdown. A visual indicator changes from green (normal) to red (fault) to signal failure. The unit supports 1P+N, 2P+N, and 3P+N configurations for use in TN-C-S and TN-S systems.
Key Benefits
- Automatically disconnects from the power grid during overheating or breakdown to prevent fire risk
- Visual green-to-red indicator shows real-time protection status without external tools
- Replaceable protector unit allows maintenance without replacing the base
- Withstands up to 100kA (8/20μs) lightning current impact for robust surge protection
- Action response time under 25ns ensures fast protection during transient events
- Supports multiple configurations: 1P+N, 2P+N, 3P+N for flexible integration in distribution boards
Who It Is For
- Electrical wholesalers stocking surge protection devices alongside conventional breakers
- Panel builders integrating SPDs into distribution boards for compliance and safety
- Switchgear assemblers building custom enclosures with built-in surge protection
- Solar EPC contractors installing SPDs at the main inverter input and sub-panels
- OEM/ODM buyers requiring a reliable, replaceable SPD for branded electrical systems
Problems It Solves
- A failed surge protector remains connected to the grid, posing a fire or shock hazard
- No visual indication of failure means a damaged SPD may go unnoticed for months
- Replacing the entire unit after a single protector failure increases downtime and cost
- Lack of fast response time leaves sensitive electronics vulnerable to transient overvoltage
- Inconsistent protection levels across different zones (LPZ1 to LPZ3) in a single installation
Application Scenarios
- Industrial control panels exposed to frequent voltage spikes from motor switching or nearby lightning
- Data centers and server rooms where equipment must remain protected during transient surges
- Commercial buildings with sensitive electronics in lighting, HVAC, and security systems
- Solar power systems where inverters and control units need surge protection at the main distribution point
- Renewable energy installations in rural or exposed areas with high lightning risk
Technical Features
How It Is Built
- Designed for AC 50/60Hz, 380V and below power systems including TT, IT, TN-S, TN-C-S
- Suitable for LPZ1, LPZ2, and LPZ3 zone surface equipotential connections
- Built to IEC61643-1 and GB18802.1 standards
- 35mm electrical guide rail mounting with fixed indoor installation
- Integrated disconnector automatically isolates the device during overheating or breakdown
- Visual indicator changes from green (normal) to red (fault) on failure
- Replaceable protector unit without replacing the base
- Can withstand 100kA (8/20μs) lightning current impulse
- Action response time less than 25ns
- Available in 1P+N, 2P+N, and 3P+N configurations
- Includes NPE zero ground protection module for 1P, 2P, 3P systems
Materials and Construction
- Flame-retardant housing designed for 35mm DIN rail mounting
- Internal surge protection components with thermal cutoff and disconnector
- Visual indicator window with color change from green to red on failure
- Conductive terminals and internal conductors for low-resistance path to ground
Quality Control
- Response time tested to ensure less than 25ns under standard impulse
- Disconnection function verified under simulated failure conditions
- Visual indicator tested for correct green-to-red transition
- Dielectric and insulation resistance tested before packing
- Mechanical stability checked on 35mm rail mounting
Specifications
Stated Ratings for This Model
| Standards Compliant | IEC61643-1, GB18802.1 |
|---|---|
| Rated Voltage | AC 50/60Hz, 380V and below |
| System Type | TT, IT, TN-S, TN-C-S |
| Installation Type | Indoor fixed, surface mounting |
| Mounting Rail | 35mm electrical guide rail |
| Configuration | 1P+N, 2P+N, 3P+N |
| Rated Current | Not specified in source text |
| Rated Impulse Withstand Voltage | Not specified in source text |
| Nominal Discharge Current | 100kA (8/20μs) |
| Maximum Discharge Current | Not specified in source text |
| Voltage Protection Level | Not specified in source text |
| Response Time | Less than 25ns |
| Visual Indicator | Green (normal), Red (fault) |
| Fail-safe Disconnection | Integrated disconnector automatically isolates on failure |
| Replaceable Unit | Protector unit replaceable without base replacement |
| Environmental Use | Indoor fixed installation |
Ratings are as published for this model. Where a value is not published we mark it TBC rather than estimating it.
Manufacturing Process
- Moulding and machining of the flame-retardant housing and mounting base
- Assembly of the surge protection module and thermal disconnector
- Installation of the visual indicator window and alignment with internal status sensor
- Testing of response time against the 25ns threshold
- Verification of disconnection function under simulated overheating or breakdown
- Final inspection and marking before packaging
Customization Options
- Available in 1P+N, 2P+N, and 3P+N configurations per order
- ODM branding on housing and packaging available upon request
- Packaging and carton marking can be tailored to buyer's specifications
- Configuration and rating selected from available series per order
Comparison
How It Compares
| Conventional SPD without disconnector | This model automatically isolates on failure, reducing fire risk and eliminating the need for manual inspection |
|---|---|
| SPD with non-replaceable module | This unit allows replacement of the protector without replacing the base, reducing long-term maintenance cost |
| SPD with no visual indicator | This model includes a green-to-red visual signal, enabling quick on-site status check without tools |
| SPD rated below 100kA | This model withstands 100kA (8/20μs), suitable for high-risk areas with frequent lightning or industrial surges |
Use Guide
- Mount the SPD on a 35mm electrical guide rail in the distribution board
- Connect the live and neutral conductors to the input terminals and the output to the protected circuit
- Ensure the NPE zero ground protection module is properly connected for 1P+N, 2P+N, 3P+N configurations
- Verify the visual indicator shows green after connection and under normal load
- If the indicator turns red, the device has failed and must be replaced with a new protector unit
- Replace the protector unit by removing the old module and inserting the new one into the same base
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FAQ
Questions About the SPD
What systems can this SPD be used in
It is suitable for TT, IT, TN-S, and TN-C-S power supply systems with AC 50/60Hz and 380V and below.
Does it automatically disconnect on failure
Yes. The integrated disconnector isolates the device from the power grid when overheating or breakdown occurs.
How do I know if the SPD is working
A green visual indicator shows normal operation. If it turns red, the device has failed and needs replacement.
Can I replace just the protector unit
Yes. The protector unit is replaceable without replacing the base, reducing maintenance cost and downtime.
What is the maximum surge current it can handle
It can withstand up to 100kA (8/20μs) lightning current impact.
What configurations are available
Available in 1P+N, 2P+N, and 3P+N configurations for use in TN-C-S and TN-S systems.
What are the minimum order quantity and lead time
Both depend on the configuration and branding required. Email [email protected] with your model list and quantities for a current answer.
Get a Quotation for the SPD
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