PV DC circuit breaker SOLARC SCB6DC-63

Q: Why a DC breaker rather than an AC breaker on the panel side?

Direct current never passes through zero: the arc that forms when the contacts open does not go out on its own as it does with alternating current. A DC breaker is designed and tested to break that arc at the voltage of photovoltaic strings. An AC breaker, even of the same rating, offers no such guarantee.

Q: How many poles should I choose?

The operating voltage increases with the number of poles wired in series: 300 V per pole for the SCB6DC-63. It must exceed the maximum open-circuit voltage of the string, calculated at the lowest temperature on site. This calculation is the installer’s responsibility.

PROTECTION FOR PHOTOVOLTAIC CIRCUITS UP TO 1,200 V DC AND 63 A

Ratings: 1 to 63 A
Breaking Capacity: 10 kA
Maximum Voltage: 1,200 V DC
Standard: IEC 60947-2

For the DC side of the installation
Designed for photovoltaic and energy storage circuits up to 1,200 V DC, the SCB6DC-63 protects lines, modules, inverters and batteries against overloads and short circuits.
Non-polarised, 1P to 4P
It can be wired in either direction, which removes the risk of reversed polarity during installation. Operating voltage of 300 V per pole: 300 V in 1P, 600 V in 2P, 900 V in 3P and 1,200 V in 4P.
Up to 10 kA breaking capacity
7.5 kA service breaking capacity, 10 kA ultimate, 6 kV impulse withstand and 1,200 V DC insulation. Thirteen ratings from 1 to 63 A, in B, C or D curve.

Documentation to download

Catalogue-SOLARC-Guide-de-selection-FR.pdf

*Product images may represent the product range, or be for illustration purposes only, and may not represent the product exactly.

Technical specifications

Electrical specifications
	SCB6DC-63
Number of poles	1P, 2P, 3P, 4P
Rated operating voltage	300 V (1P), 600 V (2P), 900 V (3P), 1,200 V (4P) DC
Frame rating	63 A
Ratings	1, 2, 3, 4, 6, 10, 16, 20, 25, 32, 40, 50, 63 A
Rated insulation voltage	1,200 V DC
Impulse withstand	6 kV
Service breaking capacity Ics	7.5 kA
Ultimate breaking capacity Icu	10 kA
Arc distance	50 mm
Tripping type	Thermal-magnetic
Tripping curves
Thermal tripping	No trip at 1.05 In (≥ 1 h), trip at 1.30 In (< 1 h)
B curve	Hold at 4 In, trip at 7 In (< 0.1 s)
C curve	Hold at 6.4 In, trip at 9.6 In (< 0.1 s)
D curve	Hold at 9.6 In, trip at 14.4 In (< 0.1 s)
Service life and standards
Mechanical endurance	20,000 operations
Electrical endurance	1,500 operations
Standards	IEC 60947-2, GB/T 14048.2
Compliance	CE, RoHS

Frequently asked questions

Why a DC breaker rather than an AC breaker on the panel side?

Direct current never passes through zero: the arc that forms when the contacts open does not go out on its own as it does with alternating current. A DC breaker is designed and tested to break that arc at the voltage of photovoltaic strings. An AC breaker, even of the same rating, offers no such guarantee.

See the whole protection range

How many poles should I choose?

The operating voltage increases with the number of poles wired in series: 300 V per pole for the SCB6DC-63. It must exceed the maximum open-circuit voltage of the string, calculated at the lowest temperature on site. This calculation is the installer’s responsibility.

See the SCB6DC-32, up to 1,000 V in 2P