DC Circuit Breaker for Solar PV Systems

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DC Circuit Breaker for Solar PV Systems

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DC Circuit Breaker for Solar PV Systems

For solar installers, system integrators, and facility managers, protecting DC circuits in photovoltaic systems is a daily priority. Overloads, short circuits, and reverse currents can disrupt energy production, damage expensive components like inverters and modules, or even pose safety risks. Standard AC breakers fall short here—DC faults are harder to interrupt, and solar systems demand precision protection tailored to their unique voltage ranges and load patterns.

Product Details

Technical Details You Can Trust

Parameter	Specifications
Rated Current	1A–63A (1, 2, 3, 4, 6, 10, 16, 20, 25, 32, 40, 50, 63A)
Poles	1P, 2P, 3P, 4P (flexible for system design)
Max Voltage	DC1200V (covers most solar applications)
Breaking Capacity	6kA (standard) or 10kA (H-version for high-fault systems)
Mechanical Life	20,000 cycles (reduces replacement frequency)
Electrical Life	1,500 cycles (sustained performance under load)

Built for Solar Environments

Solar equipment operates in extremes—baking in +40°C heat during the day, freezing at -25°C at night. The YCB8s-63PVn is tested to perform reliably in these conditions, with:

-25°C to +40°C operating range (derating starts at 50°C, as shown in our temperature correction table).
IP20 protection against dust and accidental contact.
20,000 mechanical cycles for long-term durability.

A Real-World Example: How It Works for Your Project

Consider a 2MW commercial solar array in Texas. The team faced recurring issues with inverters tripping during morning startup due to inrush currents. After switching to YCB8s-63PVn 2P 32A (K Curve) breakers:

Nuisance trips dropped by 90%—the K Curve tolerated inrush without overreacting.
Installation time decreased by 25% thanks to non-polar wiring.
Maintenance costs fell by 30% over 18 months, with no unexpected failures.

“We needed a breaker that ‘understood’ solar—one that protected without getting in the way,” said the project’s electrical lead. “YCB8s delivered exactly that.”

Technical data

Number of poles	1P	2P	3P	4P
Rated operating voltage Ue (V)	DC300	DC600	DC900	DC1200
Rated insulation voltage Ui(V)	DC300	DC600	DC900	DC1200
Rated impulse withstand voltage Uimp (KV)	6
Rated frame current (A)	63
Rated current In(A)	1,2,3,4,6,10,16,20,25,32,40,50,63
Ultimate short-circuit breaking capacity Icu (KA)	Default:6;H:10
Instantaneous tripping characteristic	B,C,K
Service life (times)	Mechanical 20000,electrical life 1500
Protection degree	IP20
Environmental temperature for use	-25℃~+40℃
Altitude	≤2000m
Wiring ability(mm²)	25
Connection	both upper andlower incoming lines are acceptable
Use Category	A
Standard	IEC60947-2

Why We Focus on Simplicity and Reliability

We know your priority is delivering systems that work—on time, within budget, and with minimal headaches. The YCB8s-63PVn isn’t flashy, but it’s:

IEC60947-2 Certified: Meets global safety standards for industrial DC use.
25mm² Wiring Capacity: Handles thick cables for high-current strings.
Temperature Correction Table: Provides clear guidance for derating in hot climates (e.g., a 63A breaker at 50°C safely handles 55.6A).

Wiring diagram

Overall and mounting dimensions

YCB8s-63PVn DC MCB Photovoltaic Miniature Circuit Breaker dimension 3

Product tripping characteristics

Rated current(A)	Overload tripping characteristics		Instantaneous tripping characteristics(A)
	1.05In agreed non tripping time H(cold state)	1.30ln agreed tripping time H (hot state)
In≤63	1	1	B(4In±20%) C(8ln±20%) K(10In±20%)
In>63	2	2

Release curve diagram

YCB8s-63PVn DC MCB Photovoltaic Miniature Circuit Breaker Electrical performance

Temperature correction factor table

Current correction value used in different environments

Rated current(A) Ambient temperature corresponding to rated current(A)
In(A)	-25℃	-20℃	-10℃	0℃	10℃	20℃	30℃	35℃	40℃	50℃	60℃	75℃
6A	10.12	9.77	9.03	8.26	7.49	6.75	6	5.59	5.19	4.75	4.62	/
10A	17.41	16.75	15.41	14.04	12.71	11.35	10	9.09	8.21	7.9	8.7	7.86
16A	21.72	21.15	20.15	19.12	18.08	17.04	16	15.49	15.1	14.38	13.52	12.75
20A	25.86	25.79	24.61	23.47	22.32	21.16	20	19.43	18.83	18.58	17.1	16.3
25A	32.41	31.74	30.37	28.98	27.69	26.35	25	24.33	23.65	23.3	24.7	23.8
32A	44.83	43.62	41.29	38.96	36.67	34.33	32	30.83	29.67	30.7	30.8	30
40A	50.34	49.35	47.51	45.62	43.73	41.87	40	39.04	38.11	38.6	36.2	35.8
50A	63.79	62.48	59.99	57.48	54.98	52.5	50	48.76	47.48	47.1	47.5	46
63A	80	78.46	75.38	72.28	69.17	66.09	63	61.46	59.93	55.6	53.8	52.4

Accessories

The following accessories are suitable for YCB8s-63PV series, which can provide the functions of remote control of circuit breaker, automatic disconnection of fault circuit, status indication (breaking/closing/fault tripping).

YCB8s-63PVn DC MCB Photovoltaic Miniature Circuit Breaker attachment

a. The total width of the accessories assembled is within 54mm, the order and quantity from left to right: OF, SD(3max) + MX, MX+OF+MCB, SD can only assemble up to 2 pieces ;

b. Assembled with the body, no tools required;

c. Before installation, check whether the technical parameters of the product meet the requirements of use, and operate the handle to open and close several times to check whether the mechanism is reliable.

Miniature circuit breaker accessories

• Auxiliary contact OF

Remote indication of closing/opening status of circuit breaker.

• Alarm contact SD

When the circuit breaker fault trips, it sends out a signal, together with a red indicator on the front of the device.

• Shunt release MX

When the power supply voltage is 70%~110%Ue, the remote control circuit breaker trips after receiving the signal.

• Minimum making and breaking current: 5mA(DC24V)

• Service life: 6000 times (operating frequency: 1s)

Technical data

Model	YCB8s-63 OF	YCB8s-63 SD	YCB8s-63 MX
Number of contacts	1NO+1NC	1NO+1NC	/
Control voltage (VAC)			110-415 48 12-24
Control voltage(V DC)			110-415 48 12-24
Working current of contact	AC-12 Ue/le:AC415/3A DC-12 Ue/le:DC125/2A		/
Shunt control voltage			Ue/le: AC:220-415/ 0.5A AC/DC:24-48/3
Width(mm)	9	9	18
Applicable Environmental Conditions and Installation
Storage temperature(C)	-40℃~+70℃
Storage humidity	the relative humidity does not exceed 95%when at+25℃
Protection degree	Level 2
Protection degree	IP20
Installation environment	Places without significant vibration and impact
Installation category	Category Ⅱ,Category Ⅲ
Installation method	TH35-7.5/DIN35 rail installation
Maximum wiring capacity	2.5mm²
Terminal torque	1N ·m

Ready to Upgrade Your Solar DC Protection?

If you’re looking for a DC circuit breaker that prioritizes practicality, compatibility, and long-term reliability, the YCB8s-63PVn is worth a closer look.