Surge Protection Device
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Surge protection devices from YADA Electronics — a Guangdong-based manufacturer (Beijing Stock Exchange: 920556) building AC and DC SPDs for EV charging cabinets, solar PV strings and industrial distribution. This category holds 6 models: AC units rated 40 kA (8/20 μs) with <25 ns response, and a DC Type 2 unit for 1000 V / 1200 V DC PV arrays. All certified CE, CB and TUV.
Configuration Follows The Earthing System, Not Preference
The 1+1, 3+1 and 4+0 designations are not product tiers — they describe how the protection modules are arranged between live conductors, neutral and earth. Choosing the wrong arrangement for the site’s earthing system leaves a path unprotected no matter how high the kA rating is.
| Configuration | Model | Arrangement | Typical Use |
|---|---|---|---|
| 1+1 | YDF40-385/1+1 | One protection module line-to-neutral plus one neutral-to-earth | Single-phase supplies to EV chargers and small cabinets. |
| 3+1 | YDF40-385/3+1 | Three line-to-neutral modules plus one neutral-to-earth | Three-phase DC charger cabinets on TT and TN-S systems. |
| 4+0 | YDF40-385/4+0 | Four modules direct to earth, low residual voltage 1.8 kV | Three-phase installations needing the lowest let-through voltage. |
| DC Type 2 | DC 1000 V / 1200 V SPD | 3P, Ucpv 1000/1200 V, Up 4.0/4.5 kV | Solar PV strings on the DC side of the inverter. |
Surge Protection Technical Specifications
| Parameter | Specification |
|---|---|
| AC surge capacity | Up to 40 kA (8/20 μs) |
| AC nominal voltage | 220 V / 380 V |
| AC protection modes | L-N, L-PE, N-PE |
| Response time | < 25 ns |
| Residual voltage | 1.8 kV (YDF40-385/4+0) |
| DC voltage (Ucpv) | 1000 V DC, 1200 V DC |
| DC In / Imax | 20 kA / 40 kA |
| DC protection level (Up) | 4.0 kV, 4.5 kV |
| DC type | Type 2, 3P |
| Temperature range | −40 °C to +80 °C |
| Mounting | 35 mm DIN rail |
| Certification | CE, CB, TUV |
Typical Applications
- EV charging cabinets — both AC and DC charger enclosures, where a single strike can destroy the power module.
- Solar PV arrays — DC Type 2 protection between the strings and the inverter.
- Outdoor distribution boards — the −40 °C to +80 °C range covers unheated enclosures.
- Telecom and monitoring cabinets — protecting the supply to instrumentation.
- Industrial switchboards — coordinated protection downstream of the main incomer.
How To Select A Surge Protection Device
- Identify the earthing system (TT, TN-S, TN-C-S) — this determines whether you need 1+1, 3+1 or 4+0.
- Confirm AC or DC. A PV string on the DC side needs a DC-rated SPD; an AC device fitted there will not interrupt DC arcs safely.
- Check the voltage rating against the open-circuit array voltage at the lowest expected temperature, not the nominal figure.
- Compare the protection level (Up) with the withstand of the equipment you are protecting — a 4.0 kV Up is useless in front of a 2.5 kV-rated device.
- Set the discharge current from the exposure. 40 kA suits most secondary protection; direct-strike locations need coordinated Type 1 upstream.
- Confirm DIN-rail space — 3P and 4-module devices need the width allowed for.
Frequently Asked Questions
What is the difference between the 1+1, 3+1 and 4+0 versions?
They describe how protection modules are arranged between live conductors, neutral and earth. The correct choice follows the site’s earthing system — it is not a performance tier.
Can an AC SPD be used on the DC side of a solar array?
No. DC has no zero crossing, so an AC device cannot safely interrupt the follow current. Use the DC Type 2 unit rated Ucpv 1000 V or 1200 V.
Why does residual voltage matter more than kA rating?
The kA rating says how much energy the device survives; the residual (let-through) voltage says what reaches your equipment. The YDF40-385/4+0 clamps to 1.8 kV, which is what protects sensitive electronics downstream.
Are these suitable for outdoor cabinets?
Yes — the range is specified from −40 °C to +80 °C, which covers unheated outdoor enclosures in most climates.
Related Product Categories
- AC Energy Meters — metering on the board the SPD protects.
- DC Energy Meters — DC-side metering for PV and charging.
- New Energy Meters — PV inverter metering and export control.
- Power Quality Analyzers — recording the voltage events the SPD responds to.
- Remote Signaling & Control Units — remote status of SPD condition contacts.
Request A Surge Protection Quote
Send the earthing system, AC or DC, nominal and maximum voltage (open-circuit array voltage for PV), the withstand rating of the equipment being protected and the available DIN-rail width.