⚡ Solar Electrical

Solar Breaker

A solar (DC) breaker provides overcurrent protection and manual switching for PV circuits. Unlike AC breakers, PV DC breakers are polarised and use enhanced arc-extinguishing to safely interrupt continuous DC. They are used in combiner boxes and at inverter DC inputs, built to IEC 60947-2.

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⚠️ Note: Observe the marked polarity and DC voltage rating exactly; never open a DC breaker under fault load beyond its breaking capacity, and isolate the array before working.

Typical specification

Property	Typical value
Type	DC miniature circuit breaker (MCB) / moulded-case breaker, polarised, DC-rated
Rating	Common ratings ~6–63 A; select above string current and below cable/fuse limits
DC voltage	Typical rating up to 1000 V or 1500 V DC (often via series poles)
Protection	DC overcurrent and short-circuit protection plus manual load-break isolation
Standard	IEC 60947-2 (circuit breakers); DC-specific rating and polarity required

Indicative / typical values for planning — actual products vary by manufacturer and standard. Confirm the final spec sheet before ordering; we do not publish fixed prices, request a quote for current offers.

Applications

String and array DC protection/isolation inside combiner boxes and at inverter DC inputs.

What to specify when you request a quote

DC voltage rating matched to system class (1000 V / 1500 V)
Trip current rating coordinated with cable ampacity and string current
Number of poles and correct polarity/wiring per manufacturer
Breaking capacity and mounting/DIN-rail format

Related in Solar Electrical

Solar Inverter Solar Cable Combiner Box ← All solar electrical

FAQ

Can an AC breaker be used on a solar DC circuit?

No. DC does not have a zero-crossing, so arcs are harder to extinguish; DC breakers are polarised and specially constructed to interrupt DC safely. Using an AC-only breaker on a PV DC circuit is a fire and shock hazard.

Why are DC breakers polarised?

Their arc-quenching design depends on current flowing in a defined direction, so line and load terminals and polarity must be wired exactly as marked; reversed connection can prevent safe interruption.

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