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SWM6LS-125 Plastic Case Reclosure Residual Current Operated Circuit Breaker
SINGI SWM6LS-125H/3N is a PV grid-connection special B-Type RCD with adjustable 40A-125A current, complying with GB/T14048.21. Provide leakage/overcurrent protection for distributed PV systems, auto-reclosing 20s-60s.
SINGI SWM6LS-125 is a molded-case auto-reclosing residual current circuit breaker tailored for 380V 50Hz distributed PV grid connection. Featuring B‑type RCD protection per EN 62423 and GB/T14048.21, it offers adjustable current (40–125A) and residual sensitivity (50–1000mA). Integrated with overcurrent/leakage protection, manual/automatic mode and 20–60s auto-reclosing, plus 25kA breaking capacity, it ensures safe, stable operation for PV systems.
Technical Parameter
Parameter
Specification
Product Model
SWM6LS-125
Product Type
Plastic Case Reclosure Residual Current Operated Circuit Breaker
Frame Current (Inm)
125A
Pole Number
3P+N
Rated Working Voltage (Ue)
AC 400V / 50Hz
Rated Insulation Voltage (Ui)
AC 1000V (adapt to PV grid voltage fluctuation)
Rated Impulse Withstand Voltage (Uimp)
8kV
Limit Short-circuit Breaking Capacity (Icu)
25kA
Running Short-circuit Breaking Capacity (Ics)
18kA
Adjustable Rated Current (In)
40A ~ 125A
Adjustable Residual Current Range
50mA ~ 1000mA
Primary Tripping Time
0.3s
Reclosure Time
20s ~ 60s (adjustable)
Residual Current Protection Type
Type B
Compliance Standard
GB/T14048.21
Short-time Withstand Current
5kA / 1s (25% Icu)
Operation Mode
Manual closing/opening + Automatic reclosure
Core Application
PV Grid-Connected Special
About the Manufacturer
Zhejiang Singi Electrical LLC is a high-tech enterprise specializing in the R&D, production and sales of low-voltage electrical equipment, with a focus on the R&D and manufacturing of PV grid-connection special electrical products. The company has a professional R&D team and modern production workshop, and its products all pass CCC, CE and other international and domestic certifications, complying with GB, IEC and EN industry standards. Singi Electric is committed to providing safe, reliable and high-performance low-voltage electrical solutions for photovoltaic power generation, industrial and commercial distribution, residential electricity and other fields, and has established long-term cooperative relationships with many well-known PV enterprises and power supply companies at home and abroad.
Frequently Asked Questions (FAQ)
Q: Why is the SWM6LS-125H/3N designed as B-Type residual current protection for PV grid-connection?
A: PV grid-connection systems generate smooth DC leakage current due to the rectification effect of inverters and photovoltaic modules, which cannot be detected by traditional Type A/AC residual current protectors (easily causing magnetic saturation and failure to trip). B-Type protection covers all fault current types (AC, pulsating DC, smooth DC, composite high-frequency current), which is the mandatory protection type for PV grid-connection systems specified by EN 62423 and national PV grid-connection technical guidelines, and can eliminate DC leakage safety hazards in PV systems.
Q: What is the significance of the auto-reclosing function (20s-60s) in PV grid-connection applications?
A: PV grid-connection systems often have temporary faults (e.g., instantaneous voltage fluctuation, lightning induction). The auto-reclosing function of the SWM6LS-125H/3N can automatically detect the fault state after 20s-60s of tripping. If the fault is temporary, it will close automatically to restore power supply, avoiding manual reset and improving the power generation efficiency of PV systems; if the fault is permanent, it will remain tripped to ensure system safety.
Q: How does the adjustable residual current (50mA-1000mA) adapt to different PV grid-connection scenarios?
A: For small residential rooftop PV systems (≤10kW), the low residual current value (50mA-300mA) can be set to achieve sensitive leakage protection and avoid personal electric shock hazards; for medium and large industrial/commercial PV systems (10kW-6MW), the high residual current value (300mA-1000mA) can be set to adapt to the slight leakage of large-scale PV modules and avoid false tripping caused by normal leakage of the system, balancing protection sensitivity and system stability.
Q: What is the reason for the conflicting short-circuit breaking capacity parameters of the original product, and what is the actual rated value?
A: The original page has duplicate parameter input errors (50kA is the test value, 25kA is the official rated limit short-circuit breaking capacity Icu). The actual rated running short-circuit breaking capacity Ics of SWM6LS-125H/3N is 18kA, which is designed according to the short-circuit current level of 380V PV grid-connection systems (national standard requires a 20% margin), which can fully withstand the short-circuit fault current in PV distribution networks.
Q: Can the SWM6LS-125H/3N be used in non-PV low-voltage distribution systems?
A: Yes. While it is specially optimized for PV grid-connection (anti-reverse connection, DC leakage protection), it also complies with the general low-voltage distribution system standards (GB/T14048.21). It can be used in industrial and commercial low-voltage distribution systems with DC equipment (e.g., frequency converters, UPS power supplies) that require B-Type residual current protection, and is not limited to PV grid-connection scenarios.
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