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St. Dorchester Center, MA 02124
Horas de trabalho
De segunda a sexta-feira: das 7h às 19h
Fim de semana: 10:00 - 17:00
AC SPD
AC Surge Protective Device (AC SPD)
Engineered for industrial and commercial distribution systems, Kuangya AC SPDs deliver reliable Type 1, Type 2, and Type 1+2 protection against overvoltage events.
Select Your AC SPD
Use tabs and filters to find the right model. Click a card to open the product detail page.
Type 1+2 AC SPD
Type 2+3 AC SPD
Protection Stack – How It Works
Each SPD Type is designed for different surge waveforms and installation points. Combined, they create a layered protection system from main distribution to terminal equipment.
TYPE 1
Entrada de serviço principal
- Waveform: 10/350 μs, high-energy lightning currents
- Placement: Main distribution board / service entrance
- Function: Diverts direct lightning surge energy
TYPE 1+2
Combined Protection
- Waveforms: 10/350 μs + 8/20 μs
- Placement: Sub-distribution or main panels
- Function: Hybrid protection for lightning and switching surges
TYPE 2
Sub-Distribution Level
- Waveform: 8/20 μs
- Placement: Distribution boards downstream
- Function: Handles switching and indirect lightning surges
TYPE 2+3
Enhanced Distribution
- Waveforms: 8/20 μs + ring wave
- Placement: Final distribution, near sensitive loads
- Function: Combines mid-level and fine protection
TYPE 3
Terminal Device Level
- Waveform: Combination / Ring
- Placement: Near terminal devices, sockets, equipment
- Function: Protects sensitive electronics from residual surges
IEC standard reference:
IEC 61643-11
(test classes I / II / III, parameters such as Iimp, Em, Imax, Para cima).
Principais recursos e benefícios
Concise highlights aligned with the selector above—clean and practical.
Replaceable plug-in modules
Hot-swap cartridges reduce downtime; base wiring remains untouched.
Thermal & overload disconnector
Built-in thermal links / short-circuit cut-off ensure safe end-of-life behavior.
Status window & remote contact
Front indication plus optional NC/NO terminals for panel monitoring.
High SCCR coordination
Works with upstream fuses/MCBs for high short-circuit withstand.
Standards compliance
Designed in line with IEC 61643-11 (Class I/II/III); UL 1449 per model.
Low residual voltage (Up)
Optimized clamping for PLCs, drives, and other sensitive electronics.
Aplicativos e casos de uso
Typical deployment of AC SPDs across distribution levels. Use this as a quick guide to select the right Type and poles.
Main Switchboard / Service Entrance
Installed at the service entrance to handle high-energy surges from lightning currents and external lines.
Sub-Distribution Panels
Layered protection downstream of the main board to reduce residual surges and coordinate with upstream devices.
Final Distribution / Floor Panels
Placed near final distribution to clamp switching and induced surges with low residual voltage (Up).
Terminal Loads (PLCs, Drives, Sockets)
Close to sensitive equipment for fine protection; used as the last stage in a coordinated system.
Industrial Facilities / Data Centers / EV Charging
High availability scenarios with coordinated stages from service entrance to terminal devices.
Residential & Commercial Buildings
From main incomer to apartment/floor boards and end devices, choose staged protection by risk level.
Parameters & Model Summary
Quick comparison of key AC SPD parameters. Replace the sample rows with your confirmed data. Keep the structure to stay consistent with the selector above.
| Modelo | Tipo | Postes | Uc (V) | In / Imax (kA) | Up (kV) | Module | Remote Contact | Typical Placement | Notas |
|---|---|---|---|---|---|---|---|---|---|
| KYSPD-15T1-40 | Tipo 1 | 1P | 275 | 20 / 40 | 1.5 | Replaceable | Opcional | Main service entrance | 10/350 µs capable |
| KYSPD-40T1+2-3P | Tipo 1+2 | 3P | 385 | 20 / 40 | 1.3 | Replaceable | With dry contact | Quadros de subdistribuição | Combined 10/350 + 8/20 µs |
| KYSPD-40T2-4P | Tipo 2 | 4P | 385 | 20 / 40 | 1.2 | Replaceable | Opcional | Final distribution / floor panels | 8/20 µs |
| KYSPD-20T3-1P | Tipo 3 | 1P | 275 | 5 / 10 | 0.9 | Replaceable | — | Terminal devices / sockets | Combination / ring wave |
* Replace Uc / In / Imax / Up with final values; keep units consistent.
* “Module” indicates plug-in replaceable design; “Remote Contact” for status signaling.
Installation & Wiring Topologies
Typical AC SPD wiring arrangements at different distribution levels. Replace the schematic placeholders with your final drawings if needed.
Service Entrance — Type 1
Install upstream at the service entrance. Handles high-energy surges (10/350 µs). Keep leads short and bonded to PE.
Tip: Place as close as possible to the incomer; observe bending radius & PE bonding.
Sub-Distribution — Type 1+2
Downstream stage combining lightning and surge discharge paths. Coordinate with upstream Type 1 and downstream Type 2/3.
Tip: Keep total lead length (L-in + L-out + PE) minimal to reduce Up.
Final Distribution — Type 2
Installed near floor panels or final distribution to clamp switching/induced surges with low residual voltage (Up).
Tip: Use short, direct PE bonding; verify coordination with upstream stages.
Terminal Devices — Type 3
Close to sensitive electronics (PLCs, drives, servers). Functions as the last stage in the cascade.
Tip: Keep device leads short; verify Up against equipment impulse withstand.
Coordinated Cascade
Full coordination from service entrance to terminal devices. Reduces residual energy stage by stage while maintaining low Up.
Tip: Verify coordination rules and spacing; follow panel maker’s guidelines for PE and conductor routing.
Why Choose Us
Engineer-grade surge protection with reliable delivery and clear guidance—built for industrial and commercial power systems.
Direto da fábrica
Own manufacturing with consistent processes and incoming/outgoing tests for every batch of AC SPDs.
Padrões e conformidade
Designed for coordinated protection with clear Type labeling (T1 / T1+2 / T2 / T2+3 / T3) and SCCR guidance.
Engineering Support
Selection, wiring and coordination—from service entrance to terminal devices—with concise guidance and quick replies.
Fast Lead Time & Logistics
Stock for common Types and poles, flexible packing, and reliable forwarding to keep projects on schedule.
Customization (OEM/ODM)
Model labeling, remote contact options, and coordination packs tailored for your panels and markets.
AC SPD - Perguntas frequentes
Short, practical answers. See wiring topologies e parameters for more details.
What’s the difference between Type 1, Type 1+2, Type 2, Type 2+3 and Type 3?
Tipo 1 handles lightning surge currents (10/350 µs), installed at the service entrance. Tipo 1+2 combines lightning + surge (10/350 + 8/20 µs) for sub-distribution boards. Tipo 2 clamps switching/induced surges (8/20 µs) at final distribution. Type 2+3 adds terminal-level enhancement. Tipo 3 protects sensitive loads at sockets/devices.
See Aplicativos
See Topologies
How do I choose Uc (continuous operating voltage)?
Escolha Uc ≥ system nominal (allowing tolerances & faults) and match the earthing system (TN/TT/IT). Typical picks: 275 V for 230/400 V systems (L-N), 320–385 V for higher L-N or where overvoltage exposure is expected. Always confirm with your panel standards and utility conditions.
Check Uc/Up table
What does Para cima mean and how low should it be?
Para cima is the SPD’s residual (let-through) voltage at a specified current/shape. Lower Up reduces stress on equipment, but must be balanced with coordination and SCCR. Keep leads short to lower effective Up at the terminals.
What is SCCR / short-circuit coordination for SPDs?
SCCR is the assembly’s ability to withstand short-circuit conditions. Many SPDs require a backup protective device (fuse/MCB) to meet the specified SCCR. Select per datasheet and panel standard; verify clearing I²t and max backup ratings.
Do I still need an external disconnector if the SPD has an internal thermal element?
Yes—internal thermal disconnect protects the module itself, but an external OCPD (fuse/MCB) is usually required for short-circuit protection and maintenance isolation. Place it per the wiring diagram and coordination rules.
How do I coordinate multiple stages (T1 → T1+2 → T2 → T3)?
Start at the service entrance with Type 1, then add Type 1+2 in sub-DBs, Type 2 in final boards, and Type 3 near devices. Keep interconnection leads as short as possible, bond to PE directly, and avoid loops to minimize inductive voltage rise.
What is the remote signaling contact used for?
Dry contacts report SPD status (e.g., OK/replace) to PLC/SCADA/BMS for maintenance alarms. Choose models with remote contact when you need centralized monitoring.
How often should I inspect or replace the module?
Check the status window during routine maintenance (e.g., quarterly). Replace plug-in modules when the indicator shows fault, after severe surge events, or per your site’s preventive-maintenance plan.
Can I use an AC SPD on a DC circuit?
No. Use DC-rated SPDs for DC systems—they differ in ratings, modes, and test standards. See our DC SPD page for PV/ESS/EV DC applications.
Which standards do these products follow and where can I learn more?
AC SPDs are designed to IEC 61643-11; regional conformity may reference UL 1449, CE, and RoHS. Contact us for datasheets and declarations.
