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YCB8-125PV Photovoltaic DC MCB
General
The YCB8-125PV series DC miniature circuit breakers are designed to handle operating voltages of up to DC1000V and currents up to 125A. They serve functions such as isolation, overload protection, and short circuit prevention. These breakers are widely applicable in photovoltaic systems, industrial setups, residential areas, communication networks, and other environments. Additionally, they are suitable for DC systems, ensuring stable and dependable operation.
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Product Details
Features
● Modular design, small size;
● Standard Din rail installation, convenient installation;
● Overload, short circuit, isolation protection function, comprehensive protection;
● Current up to 125A, 4 options;
● The breaking capacity reaches 6KA, with strong protection capacity;
● Complete accessories and strong expansibility;
● Multiple wiring methods to meet various wiring needs of customers;
● The electrical life reaches 10000 times, which is suitable for the 25-year life cycle of photovoltaic.
Selection
| YCB8 | — | 125 | PV | 4P | 63 | DC250 | + | YCB8-63 OF |
| Model | Shell grade current | Usage | Number of poles | Rated current | Rated voltage | Accessories | ||
| Miniature circuit breaker | 125 | Photovoltaic/ direct-current PV: heteropolarity Pvn: nonpolarity | 1P | 63A, 80A, 100A, 125A | DC250V | YCB8-125 OF: Auxiliary | ||
| 2P | DC500V | YCB8-125 SD: Alarm | ||||||
| 3P | DC750V | YCB8-125 MX: Shunt | ||||||
| 4P | DC1000V |
Note: The rated voltage is affected by the number of poles and wiring mode.
The single poleis DC250V, the two poles in series are DC500V, and so on.
Technical data
| Standard | IEC/EN 60947-2 | ||||
| Number of poles | 1P | 2P | 3P | 4P | |
| Rated current of shell frame grade | 125 | ||||
| Electrical performance | |||||
| Rated working voltage Ue(V DC) | 250 | 500 | 750 | 1000 | |
| Rated current In(A) | 63、80、100、125 | ||||
| Rated insulation voltage Ui(V DC) | 500VDC per pole | ||||
| Rated impulse voltage Uimp(KV) | 6 | ||||
| Ultimate breaking capacity Icu(kA) | Pv：6 PVn：10 | ||||
| Operation breaking capacity Ics(KA) | PV：Ics=100%Icu PVn：Ics=75%Icu | ||||
| Curve type | li=10ln(default) | ||||
| Tripping type | Thermomagnetic | ||||
| Service life (time) | Mechanical | 20000 | |||
| Electrical | PV：1000 PVn：300 | ||||
| Polarity | Heteropolarity | ||||
| Inline methods | Can be up and down into the line | ||||
| Electrical accessories | |||||
| Auxiliary contact | □ | ||||
| Alarm contact | □ | ||||
| Shunt release | □ | ||||
| Applicable environmental conditions and installation | |||||
| Working temperature(℃) | -35~+70 | ||||
| Storage temperature(℃) | -40~+85 | ||||
| Moisture resistance | Category 2 | ||||
| Altitude(m) | Use with derating above 2000m | ||||
| Pollution degree | Level 3 | ||||
| Protection degree | IP20 | ||||
| Installation environment | Places without significant vibration and impact | ||||
| Installation category | Category III | ||||
| Installation method | DIN35 standard rail | ||||
| Wiring capacity | 2.5-50mm² | ||||
| Terminal torque | 3.5N·m | ||||
■ Standard □ Optional ─ No
Wiring diagram
Overall and mounting dimensions(mm)
Tripping characteristics
Circuit breaker under normal installation conditions and reference ambient temperature (30~35)℃
| Tripping type | DC current | Initial state | Appointed time | Expected results |
| All types | 1.05In | Cold state | t≤2h | No tripping |
| 1.3In | Thermal state | t<2h | Tripping | |
| Ii=10In | 8In | Cold state | t≤0.2s | No tripping |
| 12In | t<0.2s | Tripping |
Curve
Temperature correction factor table
Current correction value for different ambient temperatures
| Temperature (℃) Rated current (A) | -25 | -20 | -10 | 0 | 10 | 20 | 30 | 40 | 50 | 60 |
| 63A | 77.4 | 76.2 | 73.8 | 71.2 | 68.6 | 65.8 | 63 | 60 | 56.8 | 53.4 |
| 80A | 97 | 95.5 | 92.7 | 89.7 | 86.6 | 83.3 | 80 | 76.5 | 72.8 | 68.9 |
| 100A | 124.4 | 120.7 | 116.8 | 112.8 | 108.8 | 104.5 | 100 | 95.3 | 90.4 | 87.8 |
| 125A | 157 | 152.2 | 147.2 | 141.9 | 136.5 | 130.8 | 125 | 118.8 | 112.3 | 105.4 |
Use of derating table at high altitude
Current correction factor at different altitudes
| Rated current(A) | Current correction factor | ||
| ≤2000m | 2000-3000m | ≥3000m | |
| 63, 80, 100, 125 | 1 | 0.9 | 0.8 |
Example: If a circuit breaker with a rated current of 100A is used at an altitude of 2500m, the rated current must bederated to 100A×90%=90A
Power consumption per pole of circuit breaker and wiring size
| Rated current In(A) | Nominal cross-section of copper conductor(mm²) | Maximum power consumption per pole(W) |
| 63 | 16 | 13 |
| 80 | 25 | 15 |
| 100 | 35 | 15 |
| 125 | 50 | 20 |
Accessories
The following accessories are compatible with the YCB8-125PV series circuit breakers. They enable functions such as remote operation, automatic fault circuit disconnection, and status indication (open/closed/fault trip).
Key Features
a. The total combined width of the accessories is no more than 54mm. They can be arranged in the following sequence (from left to right): OF, SD (up to 3 pieces max) + MX, MX + OF, MV + MN, MV (up to 1 piece max) + MCB. Note that a maximum of 2 SD units can be assembled.
b. Accessories are easily assembled onto the main body without requiring tools.
c. Before installation, verify that the product’s specifications meet usage requirements. Test the mechanism by operating the handle to open and close a few times, ensuring reliable performance.
Accessory Functions
● Auxiliary Contact (OF): Provides remote signaling of the circuit breaker’s open/closed status.
● Alarm Contact (SD): Sends a signal when the circuit breaker trips due to a fault, accompanied by a red indicator on the device’s front panel.
● Shunt Release (MX): Enables remote tripping of the circuit breaker when the supply voltage is within 70%-110% of Ue.
● Minimum operational current: 5mA (DC24V).
● Service life: 6,000 operations (1-second intervals).
Technical data
| Model | YCB8-125 OF | YCB8-125 SD | YCB8-125 MX |
| Appearance |  |  |  |
| Types |  |  |  |
| Number of contacts | 1NO+1NC | 1NO+1NC | / |
| Control voltage (V AC) | 110-415 48 12-24 | ||
| Control voltage(V DC) | 110-415 48 12-24 | ||
| Working current of contact | AC-12 Ue/Ie: AC415/3A DC-12 Ue/Ie: DC125/2A | / | |
| Shunt control voltage | Ue/Ie: AC:220-415/ 0.5A AC/DC:24-48/3 | ||
| Width(mm) | 9 | 9 | 18 |
| Applicable Environmental Conditions and Installation | |||
| Storage temperature(℃) | -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 | ||
Overall and mounting dimensions(mm)
Alarm Contact Outline and installation dimensions
MX+OF Outline and installation dimensions
MX Outline and installation dimensions
Data Download
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Email：cncele@cncele.com
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Address：CNC High-Tech Hutou Industrial Zone, Liushi Town,Yueqing . Wenzhou City, China
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