DC SPD
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DC SPD 600V 2 Pole | Solar Surge Protector
- Rs.2,900
Rs.3,220- Rs.2,900
- Unit price
- per
DC SPD 600V 2 Pole | Solar Surge Protector Protect your photovoltaic power generation systems with the reliable YCS6-C DC SPD. Designed specifically for solar applications, this device efficiently handles surge overvoltages caused by lightning strikes or other transient events, diverting excess energy safely...- Rs.2,900
Rs.3,220- Rs.2,900
- Unit price
- per
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DC SPD 1000V 2 Pole | Solar Surge Protector
- Rs.3,700
Rs.4,110- Rs.3,700
- Unit price
- per
Looking for a DC SPD 2 pole 1000V price in Pakistan for a solar combiner box, inverter-side DC panel, or rooftop PV protection setup? This CNC Electric solar surge protector is built for installers and buyers who want proper DC-side surge control instead of...- Rs.3,700
Rs.4,110- Rs.3,700
- Unit price
- per
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DC SPD 1500V 3 Pole | Solar Surge Protector
- Rs.8,600
Rs.9,700- Rs.8,600
- Unit price
- per
DC SPD 1500V is built for high-voltage solar strings, combiner boxes, and inverter DC input protection. This 3 pole version is listed at Rs.8,600 on CNC Electric Pakistan. If you are building a 1500V solar plant, this is the class of protector used to...- Rs.8,600
Rs.9,700- Rs.8,600
- Unit price
- per
What is a DC SPD?
A DC Surge Protection Device is a polarity-aware MOV-based surge arrester rated for photovoltaic and battery DC strings, installed inside solar combiner boxes to clamp transient overvoltages from lightning and switching events. Pakistani residential PV uses 1000 V DC strings, while commercial installs run 1500 V DC; corresponding SPD Uc values are 600 V, 1000 V, and 1500 V. Standard: IEC 61643-31 (DC PV SPDs). The YCS6 PV family covers 2P/3P with 20–40 kA Imax, plug-in cartridges and remote alarm contacts.
| PV string voltage | SPD Uc rating | Typical install |
|---|---|---|
| 250–600 V DC | 600 V | 12 V / 48 V battery banks, small PV |
| 600–1000 V DC | 1000 V | Residential rooftop solar |
| 1000–1500 V DC | 1500 V | Commercial / industrial PV |
CNC Electric Pakistan supplies the YCS6 family of DC PV SPDs at 600, 1000 and 1500 V, IEC 61643-31 certified for solar combiner-box assembly.
Updated: June 10, 2026 · CNC Electric Pakistan
DC SPD (Surge Protection Device) — Pakistan Quick Answer (May 2026)
A DC SPD in Pakistan protects solar PV systems, battery banks, and DC-bus equipment from lightning surges and voltage spikes by diverting fault current to earth within 25 nanoseconds. Standard CNC DC SPD prices range from Rs. 1,800 (2P 500V 20kA YCS6-C) for small rooftop solar to Rs. 8,500 (3P 1500V 40kA) for industrial PV plants. Critical rule: never use an AC SPD on a DC circuit — AC SPDs cannot extinguish DC arcs and will fail catastrophically.
| Solar System Size | Recommended DC SPD | CNC Model | 2026 Price (PKR) |
|---|---|---|---|
| 1–3 kW rooftop solar (24/48V battery) | 2P DC 500V 20kA Type 2 | YCS6-C 2P 500V | 1,800 |
| 3–5 kW hybrid solar (96V battery) | 2P DC 1000V 20kA Type 2 | YCS6-C 2P 1000V | 2,400 |
| 5–10 kW on-grid / hybrid solar | 2P DC 1000V 40kA Type 1+2 | YCS6-C 2P 1000V 40kA | 3,800 |
| 10–30 kW commercial solar (3 strings) | 3P DC 1000V 40kA Type 2 | YCS6-C 3P 1000V | 5,500 |
| 30–100 kW industrial PV plant | 3P DC 1500V 40kA Type 1+2 | YCS6-C 3P 1500V | 8,500 |
| Replaceable cartridge module (any of above) | Single-pole DC SPD cartridge | DC SPD cartridge | 650–1,200 |
Quick decision: For a typical Pakistani 5 kW rooftop solar with 96V battery → YCS6-C 2P 1000V 20kA at PKR 2,400. Install one on the DC side between PV array and inverter, one on the AC side between inverter and DB. All CNC DC SPDs: IEC 61643-31 compliant, polarity-marked, replaceable cartridge design, 1-year warranty.
Read also: 5 SPD Fire Case Studies — Pakistan · AC SPD Collection · DC Breakers for Solar
DC SPD — Why You Cannot Skip It on a Solar Installation
Pakistan averages 40–60 lightning days per year in Punjab, Khyber Pakhtunkhwa, and Sindh's rural belt. Every lightning strike within 1.5 km of a solar array can induce a 6 kV–10 kV transient on the DC side that destroys the inverter, panels, or battery in microseconds. A DC SPD installed correctly absorbs that surge and shunts it to earth before it reaches your equipment.
The 2026–2026 Pakistani solar boom saw an estimated 1,400+ inverter failures specifically caused by missing or wrong-type DC SPDs. The fix is one PKR 2,400 device installed during commissioning — vs PKR 80,000+ inverter replacement after a strike.
DC SPD vs AC SPD — Don't Mix Them Up
| Factor | AC SPD | DC SPD |
|---|---|---|
| Voltage | 230 V AC / 400 V AC | 500 V / 1000 V / 1500 V DC |
| Used for | Mains side of DB, inverter AC output, factory panels | PV array, battery bank, DC bus, EV chargers |
| Arc extinction | AC 50 Hz zero-crossing | DC has no zero-crossing — needs special arc chamber |
| Polarity marked? | No | Yes (+ / − terminals) |
| If wrongly used on opposite side | AC SPD on DC = fails to interrupt, catches fire | DC SPD on AC = works but oversized; wasteful |
| Marking | "AC" or "Uc 275V AC" | "DC" or "Uc 1000V DC" + PV symbol |
Critical: A PKR 800 AC SPD installed on a 1000 V DC solar string is one of the leading causes of inverter fires in Pakistani rooftop installations. Always verify the front label says "DC" and the voltage matches your PV string voltage.
Type 1, Type 2, Type 3 — Which DC SPD Do You Need?
| Type | Tested With | Install Where | Used For |
|---|---|---|---|
| Type 1 | 10/350 µs lightning impulse (Iimp) | Service entrance — closest to lightning source | Buildings with external lightning rod (LPS) |
| Type 2 | 8/20 µs (In, Imax) | DB / inverter input — most Pakistani solar | 90% of rooftop solar (no lightning rod) |
| Type 3 | Combination wave 1.2/50 µs + 8/20 µs | Equipment-side (after Type 2) | Sensitive electronics, monitoring |
| Type 1+2 | Both standards | Single unit at service entrance | Commercial PV plants, taller buildings |
For most Pakistani 1-15 kW rooftop solar installations → use Type 2 DC SPD. Type 1 is only required if the building has a lightning rod (which most don't in residential Pakistan). Type 3 adds equipment-side protection but isn't always cost-justified unless protecting a Rs. 200K+ inverter.
How to Size a DC SPD for Your Solar System
Step 1 — Match the DC SPD voltage rating to your PV string voltage
| PV String Voc (Open Circuit Voltage) | Required DC SPD Uc | Typical PV System |
|---|---|---|
| Up to 350 V DC | 500 V DC SPD | 8–10 panels in series |
| 350–700 V DC | 1000 V DC SPD | 15–20 panels in series |
| 700–1100 V DC | 1500 V DC SPD | Commercial/utility scale |
Common mistake: Installers use a 500 V DC SPD on a string with 580 V Voc thinking it's "close enough." It's not — the SPD's MOV starts conducting at 500 V, draws current continuously, overheats, and fails within months.
Step 2 — Choose the kA rating (Imax)
- 20 kA Imax (Type 2) — adequate for most Pakistani rooftop solar (no lightning rod, low exposure)
- 40 kA Imax (Type 1+2) — for higher-exposure installations: rural sites, hilltops, buildings with lightning rods
- 65 kA+ Imax — industrial PV plants, telecom towers, critical infrastructure
Step 3 — Pole count = positive + negative (sometimes + earth)
| Poles | Configuration | Use When |
|---|---|---|
| 2P (DC+ / DC−) | Floating / isolated PV system | Most residential rooftop solar in Pakistan |
| 3P (DC+ / DC− / PE) | Grounded PV system, MPPT inverter | Commercial/hybrid with grounded MPPT |
| 4P | Multi-string array with shared PE | Multi-string industrial inverters |
Where to Install — Critical Wiring Rules
- Install AS CLOSE as possible to the protected equipment — within 0.5 m of inverter DC input ideally. Every extra metre of cable between SPD and inverter reduces protection by ~10%.
- Earth wire length < 0.5 m, cross-section ≥ 6 mm² copper, going directly to earth bar (not daisy-chained).
- Always install a DC fuse or DC MCB upstream of the DC SPD. If the SPD fails short, the fuse interrupts. Use CNC YCB8-63PV DC MCB 16A or 25A.
- Replace the cartridge when the indicator turns red — DC SPDs have a wear indicator window. Once red, the SPD has absorbed too many surges and is no longer providing protection.
DC SPD Frequently Asked Questions — Pakistan
Q1: What is a DC SPD and why do I need one for solar?
A DC SPD (Surge Protection Device) protects DC circuits — primarily solar PV strings and battery banks — from lightning surges by diverting fault current to earth in nanoseconds. Without one, a nearby lightning strike can destroy your inverter, MPPT, and battery bank in microseconds. For any rooftop solar in Pakistan (40-60 lightning days/year), a DC SPD is essential.
Q2: What is the price of a DC SPD in Pakistan?
CNC DC SPD prices in 2026 start at Rs. 1,800 for a 2P 500V 20 kA YCS6-C (1-3 kW solar) and go up to Rs. 8,500 for a 3P 1500V 40 kA (industrial PV plant). The most popular size for Pakistani 5 kW rooftop solar is 2P 1000V 20 kA at Rs. 2,400.
Q3: Can I use an AC SPD on a DC solar circuit?
No — never. AC SPDs cannot extinguish DC arcs (no zero-crossing), and an AC SPD on a DC line will fail catastrophically, often catching fire. Always use a properly DC-rated SPD with the voltage marking matching your PV string voltage (500V / 1000V / 1500V).
Q4: How do I know if my DC SPD is still working?
Every CNC DC SPD has a wear indicator window on the front. Green = working, Red = end of life — replace immediately. SPDs are sacrificial: each surge they absorb degrades the MOV slightly. After enough surges (typically 5-10 years of normal operation), the indicator turns red.
Q5: Type 1 or Type 2 DC SPD — which do I need?
For 90% of Pakistani rooftop solar (1-15 kW, no external lightning rod), Type 2 is correct. Type 1 is only required if your building has an external lightning protection system (LPS) with a metal rod and down-conductor — typical only for taller commercial buildings. Type 1+2 combination devices offer both in one unit, useful for commercial PV.
Q6: Where exactly should I install the DC SPD?
Install within 0.5 m of the inverter DC input, with the earth wire less than 0.5 m to the earth bar. Use 6 mm² copper for the earth connection. Add a DC fuse or DC MCB (16-25 A) upstream as backup overcurrent protection.
Q7: Do I need separate AC and DC SPDs in a solar installation?
Yes. A complete solar install needs DC SPD on the DC side (between panels and inverter) AND AC SPD on the AC side (between inverter output and main DB). One DC + one AC SPD per system is the standard configuration. Skipping either leaves half the system unprotected.
Q8: Are CNC DC SPDs PSQCA certified?
Yes. All CNC YCS6-C series DC SPDs carry IEC 61643-31 compliance and PSQCA approval. The certification details are printed on the side label of each unit. Verify before installation.
Protect your solar systems, DC circuits, and sensitive electronic equipment with high-quality DC Surge Protection Devices (DC SPD) from CNCelectric.pk. Designed for both residential and industrial applications, our DC SPDs safeguard your devices from lightning strikes, power surges, and voltage spikes, ensuring long-lasting performance and uninterrupted operation.
In Pakistan, power instability and occasional lightning surges can cause serious damage to solar panels, inverters, batteries, and DC wiring systems. Our DC SPDs provide fast, reliable protection, automatically diverting excess voltage to ground before it reaches your valuable equipment.
Why Choose CNCelectric.pk DC SPDs?
- Rapid Response Protection: Immediately reacts to dangerous voltage surges to prevent system damage.
- Wide Compatibility: Works with solar panels, DC combiner boxes, inverters, and industrial DC systems.
- Durable & Reliable: Made with high-quality components to withstand harsh conditions and ensure long service life.
- Easy Installation: Modular design makes it simple to install or replace.
- Custom Voltage Options: Available for 600V, 1000V, and 1500V DC systems.
Whether you are securing a solar power system, DC distribution panel, or a CNC industrial setup, our DC SPDs provide complete power protection. With competitive DC SPD price in Pakistan, you can protect your investment without compromising on quality.
CNCelectric.pk ensures every DC SPD is tested for safety, reliability, and performance, giving you peace of mind and maximum protection for all your critical DC equipment.
📖 Related Guide: SPD Guide for Solar Systems
📖 Related Guide: 1500V DC SPD Guide
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SPD Class Selection Quick-Reference
| Class | Where to Use | Price (PKR) |
|---|---|---|
| Class 1 (T1) | Main DB, lightning zone | Rs. 8,500 – 13,500 |
| Class 2 (T2) | Sub-DB, equipment-level | Rs. 2,800 – 4,500 |
| Class 3 (T3) | Sensitive electronics, plugs | Rs. 700 – 1,500 |
| Class 1+2 combo | Single-device main protection | Rs. 11,500 – 16,500 |
| DC SPD 1000V | Solar string protection | Rs. 3,800 – 6,500 |
Full in-depth guide: SPD Pakistan Complete Guide — Class 1, 2, 3 — includes sizing formulas, wiring diagrams, FAQ and 2026 Pakistani pricing.
