DC Breaker Price in Pakistan 2026 — Solar, Battery & Low-Voltage Buyer's Guide | CNC Electric

A DC circuit breaker is the most important — and most misunderstood — protection device in any solar PV system, battery bank, or low-voltage DC installation. Standard AC breakers cannot safely interrupt DC fault currents, yet they are still routinely (and dangerously) used on the solar side of Pakistani residential installations. This guide explains why DC breakers are fundamentally different from AC, how to size them correctly for 500 V / 1000 V / 1500 V solar arrays, and which CNC models fit each application — with real Pakistan prices from Rs. 1,150 to Rs. 3,400.

CNC stocks the YCB8s-63PV series (solar PV) and YCB1-125 series (heavy DC / battery) in 1-pole, 2-pole, and 4-pole configurations at 500 V and 1000 V DC ratings. All units carry IEC 60947-2 compliance, 6 kA short-circuit interrupting capacity at rated DC voltage, and a 5-year warranty.

DC Breaker Price in Pakistan 2026 — CNC Range

Model	Type	Poles	Voltage	Current	Use Case	Price (PKR)
YCB8s-63PV 1P 500V	Solar PV MCB	1 Pole	500 V DC	10-63 A	Solar string positive or negative leg	Rs. 800 – 1,200
YCB8s-63PV 2P 500V	Solar PV MCB	2 Pole	500 V DC	10-63 A	Solar string both legs (PV + PV-)	Rs. 1,600
YCB1-125 1P 500V	DC MCB	1 Pole	500 V DC	125 A	Battery disconnect single leg, combiner	Rs. 1,150
YCB1-125 2P 500V	DC MCB	2 Pole	500 V DC	125 A	Battery bank disconnect both legs	Rs. 2,500
YCB8s-63PV 4P 1000V	Solar PV MCB	4 Pole	1000 V DC	10-63 A	Higher-voltage solar arrays, 2-string in series	Rs. 3,400
YCB8s 4P 1500V (on order)	Solar PV MCB	4 Pole	1500 V DC	10-63 A	Utility-scale / commercial roof arrays	Rs. 4,200

Free delivery across Pakistan. 5-year warranty. Bulk & dealer pricing — WhatsApp +92 326 1111376. Browse the full CNC DC Breaker Collection.

What Is a DC Circuit Breaker?

A DC circuit breaker performs the same function as its AC counterpart — interrupting an electrical circuit on overload or short-circuit — but uses a fundamentally different arc-extinguishing mechanism to handle the continuous current of direct current.

The DC breaker sits between two power sources and the load: between solar panels and an inverter, between a battery bank and an inverter / charger, between a DC bus and downstream equipment. When current exceeds the rated value (overload) or jumps thousands of times above rated value (short-circuit), the breaker opens its contacts. The challenge in DC: those contacts must extinguish a continuous arc rather than wait for an AC zero-crossing.

Why You Cannot Use an AC Breaker on a DC Circuit

This is the most dangerous misconception in Pakistani solar installation work. Every year, fires start from AC-rated breakers placed on DC PV strings or battery banks. The physics:

• AC interruption is easy. Alternating current naturally crosses zero 100 times per second (at 50 Hz). When an AC breaker opens, the arc between the contacts dies out at the next zero-crossing — within 10 milliseconds. The breaker just needs to interrupt; physics does the work.
• DC interruption is hard. DC has no zero-crossing. The current is continuous. When a DC breaker opens, the arc keeps burning indefinitely — drawing power from the source, ionising air between contacts, and eroding the contact surfaces. Without intervention, the arc never goes out.
• DC breakers force the arc to extinguish. They use stronger magnetic blow-out coils, larger arc-chambers with deionising plates, and specific contact geometries to stretch the arc until its voltage drop exceeds the supply voltage — at which point the arc collapses.

An AC breaker placed on a DC short-circuit fault will not interrupt. The arc continues until the cables melt, the inverter explodes, or the lithium battery catches fire. Use DC-rated breakers on the DC side. Always.

DC Breaker Voltage Ratings — 250V, 500V, 1000V, 1500V

The voltage rating of a DC breaker is the maximum voltage it can safely interrupt under fault conditions — not the operating voltage. Critical for solar where panel voltage scales with the number of panels in series.

DC Voltage Rating	Typical Solar Application	Pole Configuration
250 V DC per pole	Small solar (1-2 panels in series, 12-24 V battery)	1P or 2P
500 V DC per pole	Standard residential solar (8-12 panels in series)	2P (both legs)
1000 V DC total (2 poles in series)	Larger residential / small commercial (16-24 panels)	4P (2 poles for + leg, 2 poles for − leg)
1500 V DC total (3 poles in series)	Utility / commercial-scale roof (24+ panels)	6P or specialised 3P

The CNC YCB8s-63PV 2P 500V handles a single solar string up to ~10 panels in series (open-circuit voltage typically 38-42 V per panel × 10 = 380-420 V, safely under the 500 V rating with margin). The 4P 1000V version handles up to ~24 panels in series by using two pole-pairs in series.

CNC YCB8s-63PV vs YCB1-125 — Which Series to Buy

The two CNC DC breaker series target different applications:

• YCB8s-63PV (Solar PV-rated): Up to 63 A current, 500 V or 1000 V DC. Specifically designed for solar PV string applications — the "PV" suffix indicates compliance with the rapid-shutdown and ground-fault detection conventions used in solar codes. Bi-directional current handling (panels can backfeed at night). Rs. 800 – 3,400 depending on poles and voltage.
• YCB1-125 (Heavy DC): Up to 125 A current, 500 V DC. Built for battery disconnect, large solar combiner boxes, and heavy DC industrial loads where the YCB8s 63 A capacity is insufficient. Single-directional rated. Rs. 1,150 – 2,500 depending on poles.

Use YCB8s-63PV on the PV (panel-to-inverter) side. Use YCB1-125 on the battery (inverter-to-battery) side or combiner-box main disconnect.

DC Breakers for Solar — Where to Install

A complete solar PV system needs DC breakers at three points:

1. String breaker (panel to combiner): One YCB8s-63PV 2P 500V per PV string at the combiner box. Disconnects the string for maintenance and protects against backfeed faults. Sized to 1.25× the string short-circuit current (Isc × 1.25).
2. Combiner-to-inverter main DC breaker: One larger breaker (YCB1-125 or matching MCCB) at the combiner output, before the inverter DC input. Protects the home wiring from inverter-side faults.
3. Battery breaker (battery to inverter): One YCB1-125 2P 500V at the battery bank output. Required for safe service work on the battery — without it, you cannot disconnect a 200 Ah lithium pack for repair.

For 5 kW residential systems (typical Pakistani net-metering installation), use: 1× YCB8s-63PV 2P 500V per string + 1× YCB1-125 2P 500V at the battery. Total DC protection cost: Rs. 4,100. See our Net Metering Pakistan 2026 guide for the complete protection bundle.

DC Breakers for Battery Banks & Low-Voltage Systems

Battery bank applications differ from solar in three ways:

• Higher current, lower voltage. A 48 V 200 Ah lithium battery delivers up to 200 A continuous, 500+ A on inverter inrush. Sizing focuses on amperage rather than voltage.
• Bidirectional considerations. The battery can charge (current into pack) or discharge (current out of pack). The breaker must handle both directions.
• Short-circuit current is enormous. A modern LFP battery delivers 10,000+ amps into a dead short. The breaker must have adequate interrupting capacity (kA rating) for the specific battery.

For 48 V battery systems up to 6 kW inverter, the CNC YCB1-125 2P 500V at 100-125 A is the right answer. For larger systems (24 V 400 Ah forklift packs, telecom 48 V plant), step up to a DC MCCB. Never substitute an AC breaker — the LFP short-circuit will weld the contacts shut.

Trip Curves — B, C, K for DC

DC breakers use the same B / C / K curve nomenclature as AC, but with different practical implications:

• B-Curve (3-5× rated): Pure resistive DC loads (heaters, lamps, electrolysis). Rare in solar / battery applications.
• C-Curve (5-10× rated): The default for solar PV strings and battery banks. Tolerates inverter inrush and charge / discharge transients without nuisance tripping.
• K-Curve (8-12× rated): Heavy inductive DC loads (DC motors, contactors with high inrush). Used in specialised industrial DC drives.

CNC YCB8s and YCB1 series ship as C-curve by default — the right choice for 95% of Pakistani solar and battery installations.

Sizing Your DC Breaker — Solar PV String Example

System Size	String Configuration	String Current (Isc)	Recommended Breaker
3 kW (8 panels @ 380 W)	8 series × 1 string	~11 A Isc	YCB8s-63PV 2P 16A @ 500V
5 kW (12 panels @ 420 W)	12 series × 1 string	~12 A Isc	YCB8s-63PV 2P 16A @ 500V
10 kW (24 panels @ 420 W)	12 series × 2 strings	~12 A Isc per string	2× YCB8s-63PV 2P 16A @ 500V
10 kW high-voltage (24 panels in 1 series)	24 series × 1 string	~12 A Isc	YCB8s-63PV 4P 16A @ 1000V
15 kW commercial	16 series × 3 strings	~36 A combined	1 per string + YCB1-125 main

Rule of thumb: breaker rating = 1.25 × Isc, rounded up to the next standard size (16, 20, 25, 32, 40, 50, 63 A). The 1.25× margin accounts for high-irradiance days when actual current can exceed the data-sheet Isc by ~20%.

Top Picks by Use Case

Best Value Solar String (5-8 kW residential): YCB8s-63PV 2P 500V. Rs. 1,600 — handles one solar string up to 10 panels in series. C-curve default. View product →

Best for Larger Solar (10-15 kW with high-voltage strings): YCB8s-63PV 4P 1000V. Rs. 3,400 — handles up to 24 panels in a single high-voltage string. View product →

Best for Battery Bank Disconnect: YCB1-125 2P 500V 125A. Rs. 2,500 — handles 48 V / 100 Ah-400 Ah lithium banks. Mandatory for service safety. View product →

Best for Combiner-Box Main Disconnect: YCB1-125 1P 500V 125A. Rs. 1,150 — single-pole main feeder. Pairs with the 2-pole version on the negative leg. View product →

CNC vs Chint vs Schneider vs Tomzn — DC Breaker Brand Comparison

Brand	Origin	Warranty	Voltage Range	PV Variant	Price for 2P 500V 32A
CNC YCB8s-63PV	Imported, Lahore-stocked	5 years	250V – 1500V DC	Yes (PV / PVn)	Rs. 1,600
Chint NB1-63 DC	Imported (China)	2 years	250V – 1000V DC	Yes	Rs. 1,800 – 2,400
Chint 125A DC MCCB	Imported (China)	2 years	500V DC	No (battery class)	Rs. 3,500 – 5,500
Schneider iC60 PV	European premium	3 years	250V – 1500V DC	Yes	Rs. 4,500 – 7,500
Tomzn (online only)	Direct import	None	500V DC	Yes (limited)	Rs. 2,200 – 3,500
Generic Chinese	Direct import	None	500V DC (rating often optimistic)	Yes (questionable)	Rs. 900 – 1,500

CNC and Chint occupy the imported quality tier with verifiable IEC 60947-2 compliance and proper PV bidirectional rating. Generic Chinese breakers under Rs. 1,500 frequently fail in field — the printed 500 V rating is often optimistic and the breaker locks up rather than interrupts on real fault current. Schneider is the premium choice for utility-scale and commercial work.

Installation Wiring — Solar PV String

1. Switch OFF the solar isolator at the panel array. Cover the panels with an opaque tarp to stop output (panels generate current whenever exposed to light).
2. Mount the YCB8s-63PV 2P 500V on the DIN rail in the solar combiner box, downstream of the string fuses if any.
3. Connect the positive (PV+) string conductor to the top-left input terminal. Connect the negative (PV−) string conductor to the top-right input terminal.
4. Connect the positive output to the inverter PV+ input. Connect the negative output to the inverter PV− input.
5. Verify polarity with a multimeter before energising — DC reverse-polarity can damage the inverter input.
6. Remove the tarp from the panels. Switch the breaker ON. The inverter should display the string voltage on its DC monitoring screen.
7. Test the breaker by toggling it OFF and confirming the inverter DC voltage drops to 0 V.

Critical: never disconnect a live DC string under load — open the inverter first to stop current flow, then operate the breaker. Live disconnection can draw a large sustained arc.

Common DC Breaker Mistakes to Avoid

• Using AC breakers on DC. Cannot extinguish the DC arc. Will fail on fault and start a fire. Always specify DC-rated.
• Wrong voltage rating. A 500 V DC breaker on a 24-panel series string (~900 V) will arc-over internally on fault. Match voltage to actual string voltage.
• Single-pole on bipolar PV. Modern PV systems often have both PV+ and PV− isolated from ground. Both legs need switching with a 2-pole breaker. Single-pole leaves one leg energised under fault.
• Disconnecting under load. Open the inverter / load first, then the breaker. Avoiding the under-load arc dramatically extends contact life.
• Sizing to short-circuit current (Isc) without margin. Always use 1.25× Isc minimum.
• Skipping the battery breaker. "I'll add it later" is the most common deferred safety failure. Service work without a battery disconnect is dangerous.

Bulk & Solar-Installer Dealer Pricing

CNC YCB8s-63PV and YCB1-125 DC breakers are stocked in Lahore with same-day dispatch nationwide. Solar installer bundles (DC breaker + SPD + voltage protector + RCBO + cable lugs) priced together. NEPRA-compliant net-metering bundles for residential installers — 5 kW, 10 kW, 15 kW packages. WhatsApp +92 326 1111376 with your project requirement.

Frequently Asked Questions — DC Breaker Pakistan

What is a DC circuit breaker?

A DC circuit breaker interrupts a direct-current circuit on overload or short-circuit. Unlike AC breakers, DC breakers use stronger magnetic blow-out coils and larger arc-extinguishing chambers because direct current has no natural zero-crossing to help end the arc. DC breakers are essential for solar PV systems, battery banks, and any low-voltage DC installation.

What is the price of a DC breaker in Pakistan?

CNC DC breakers range from Rs. 800 for a single-pole 500 V solar breaker (YCB8s-63PV 1P) to Rs. 3,400 for a 4-pole 1000 V DC solar breaker (YCB8s-63PV 4P). Battery-class breakers (YCB1-125) cost Rs. 1,150 – 2,500. Local generic imports under Rs. 1,000 are available but have questionable kA ratings — Chint and Schneider go from Rs. 1,800 to Rs. 7,500 for equivalent specifications.

Can I use an AC breaker for solar?

No — never. AC breakers rely on the 100-time-per-second zero-crossing of the AC waveform to extinguish the internal arc. DC has no zero-crossing — the current is continuous — so an AC breaker placed on a DC short-circuit fault will not interrupt. The arc continues burning until the cables melt or the inverter fails. Always use DC-rated breakers on the solar PV and battery side.

What size DC breaker do I need for my solar system?

Match the breaker rating to 1.25 × the string short-circuit current (Isc) from the panel data sheet, rounded up to the next standard size (16, 20, 25, 32, 40, 50, 63 A). For a typical 5 kW residential string (12 panels @ ~12 A Isc), use a 16 A DC breaker. For a 10 kW commercial array, use 16-25 A per string. Voltage rating must exceed the open-circuit voltage of the full string.

What voltage rating should my DC breaker have for solar?

Add up the open-circuit voltage (Voc) of all panels in series and multiply by 1.25 for temperature margin. For 8 panels (~38 V Voc each) × 1.25 = 380 V — use a 500 V DC breaker. For 16 panels series-strung = ~760 V × 1.25 = 950 V — use 1000 V DC. For utility-scale 24+ panels in series, use 1500 V DC breakers. Never under-rate voltage — the breaker can fail to interrupt on fault.

What is the difference between a DC MCB and a DC MCCB?

A DC MCB (Miniature Circuit Breaker) handles up to 125 A and 6 kA interrupting capacity in a compact DIN-rail body. A DC MCCB (Moulded Case Circuit Breaker) handles up to 2500 A and 25-70 kA interrupting capacity in a larger panel-mount housing with adjustable trip settings. Use MCBs for residential solar (≤ 10 kW). Use MCCBs for commercial solar combiner outputs and large battery banks.

Can I use a DC breaker for my battery bank?

Yes — and you should. Battery banks need a DC disconnect breaker on the output for safe service work. The CNC YCB1-125 2P 500V 125A is rated for typical residential 48 V battery banks up to 6 kW inverter loads. For larger systems, step up to a DC MCCB. Always size to handle the battery's short-circuit current — modern LFP batteries deliver 10,000+ A into a dead short.

Do CNC DC breakers work with Schneider or Chint panels?

Yes. CNC DC breakers comply with IEC 60947-2 international standards and are dimensionally compatible with standard DIN-rail panels from Schneider, Chint, Hager, ABB, and other major brands. No special accessories needed — the breaker clips onto the standard 35 mm DIN rail used in all modern Pakistani panel work.

How do I install a DC breaker safely?

Cover solar panels with an opaque tarp before opening the DC circuit (panels generate current whenever exposed to light). For battery banks, switch off the inverter and any DC loads first. Mount the breaker on the DIN rail with the toggle in the OFF position. Connect the input terminals to the source (panel string or battery), output terminals to the load (inverter). Verify polarity with a multimeter before energising. Remove the tarp / restore the inverter, switch the breaker ON, and confirm operation with the downstream system.

Why does my DC breaker keep tripping?

Most common causes: (1) genuine overload — string irradiance higher than expected, breaker undersized; (2) ground fault in PV string — measure insulation resistance with a megger; (3) inverter drawing more than rated current during boost or charging mode; (4) faulty breaker (replace if it trips with no load). For solar systems, a tripping breaker often indicates a developing fault — investigate before resetting.

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