EXB8-125DC Photovoltaic Miniature Circuit Breaker (DC MCB)
Non-Polarized DC Protection to 1000V — Built for PV Strings and Battery Banks
The EXB8-125DC is a 125A frame DC miniature circuit breaker for photovoltaic strings, energy storage cabinets and battery protection. A non-polarized arc chamber accepts current in either direction, so a single device protects forward and reverse circuits without wiring restrictions, while the 2P version switches 1000V DC in one compact DIN module.
Model
EXB8-125DC Series — DC Miniature Circuit BreakerEXB8-125DC 1P / 2P · B/C curve · Ie 63/80/100/125A · 500V / 1000V DC
IEC/EN 60947-2 · 4.5kA Icu and Ics · 6kV impulse withstand · DIN rail 35mm
Product Information
Product Application
This circuit breaker provides short-circuit protection, overload protection,control and isolation functions.It is especially suitable for photovoltaic,energy storage systems and battery protection.
Product Advantages
– Equipped with overload and short-circuit protection functions
– Maximum operational short-circuit breaking capacity up to 4.5 kA
– Non-polarized design, supports forward and reverse current protection
– Rated voltage up to 1000V, designed for photovoltaic, energy storage and other DC applications
– Complies with EN/IEC 60947-2 standard
Product Advantages
| Number of Poles | 1P | 2P | |
| Rated Operational Voltage Ue | 500V DC | 1000V DC | |
| Frame Rating | 125A | ||
| Rated Current In | 63A,80A,100A,125A | ||
| Rated Insulation Voltage Ui | 1600V | ||
| Rated Impulse Withstand Voltage Uimp | 6kV | ||
| Trip Characteristic | B/C | ||
| Trip Type | Thermal-magnetic | ||
| Ultimate Breaking Capacity Icu | 4.5kA | ||
| Service Breaking Capacity Ics | 4.5kA | ||
| Electrical Life | Actual average value | Rated current:125A,more than 1000 times | |
| Standard specified value | Rated current:125A,200 times | ||
| Mechanical Life | Actual average value | >10000 times | |
| Standard specified value | 10000 times | ||
| Overvoltage Category | Ⅲ | ||
| Pollution Degree | 3 | ||
| Protection Class | IP40;Terminal part IP20 | ||
| Damp Heat Resistance | Class 2 | ||
| Relative Humidity | ≤95% | ||
| Vibration Resistance | In accordance withIEC60068-2-6 | ||
| Mechanical Shock Resistance | In accordance withIEC60068-2-27 | ||
| Wiring Capacity | 2.5~50mm2 | ||
| Wiring Torque | 3.5 N.m | ||
| Ambient Operating Temperature | -30℃~70℃ | ||
| Storage Temperature | -40℃~85℃ | ||
| Mounting Type | DIN35 | ||
| Altitude | ≤2000m | ||
Wiring Diagram
Installation
This product adopts DIN rail mounting, for installation on a 35mm standard DIN rail.
Trip Characteristic
Derating Factor
| Temperature Derating Factor Table | ||||||||||||||||||||||
| Temperature | -30℃ | -25℃ | -20℃ | -15℃ | -10℃ | -5℃ | 0℃ | 5℃ | 10℃ | 15℃ | 20℃ | 30℃ | 35℃ | 40℃ | 45℃ | 50℃ | 55℃ | 60℃ | 65℃ | 70℃ | ||
| Rated Operating Current Factor | 1.242 | 1.223 | 1.204 | 1.182 | 1.161 | 1.143 | 1.127 | 1.103 | 1.079 | 1.063 | 1.047 | 1 | 0.984 | 0.968 | 0.952 | 0.922 | 0.904 | 0.891 | 0.872 | 0.844 | ||
| Temperature Derating Factor Table | ||||||||||||||||||||||
| Altitude(m) | 2000 | 3000 | 4000 | 5000 | ||||||||||||||||||
| Rated Operating Current Factor | 1 | 0.96 | 0.91 | 0.86 | ||||||||||||||||||
| Rated Operating Voltage Factor | 1 | 1 | 1 | 1 | ||||||||||||||||||
| Rated Power-frequency Withstand Voltage Factor | 1 | 0.9 | 0.82 | 0.71 | ||||||||||||||||||
| Rated Impulse Withstand Voltage Factor | 1 | 0.9 | 0.82 | 0.71 | ||||||||||||||||||
| Rated Ultimate Short-circuit Breaking Capacity&Electrical Life Factor | 1 | 0.82 | 0.7 | 0.6 | ||||||||||||||||||
Wiring
| Wire Harness Specification Selection | |||
| Current Rating(A) | Copper Wire Gauge(AWG) | Conductor Cross-sectional Area(mm²) | Wiring Torque(N ·m) |
| 80A | 4 | 25 | 3.0~4.0 |
| 100A | 2 | 35 | |
| 125A | 1 | 50 | |
Overall Dimensions
Wiring
