A practical low-voltage layer for renewable-energy support systems
Solar and energy projects need well-defined protection between AC generation interfaces, distribution boards, auxiliary equipment and building loads. Products must be selected for their exact circuit location; an AC-rated device must not be assumed suitable for photovoltaic strings or battery DC circuits.
Bentong supports the low-voltage AC distribution and control scope with circuit breakers, contactors, protection devices and industrial controls. Dedicated DC circuits require purpose-rated DC products selected from verified voltage, polarity, fault-current and isolation requirements.
Key electrical requirements
AC-side fault protection
Confirm system voltage, available fault current and the contribution of connected sources at each AC distribution point.
Circuit separation
Keep generation interfaces, auxiliary supplies, building loads and maintenance circuits clearly identified.
Environmental suitability
Account for panel temperature, enclosure protection, altitude and indoor or outdoor installation conditions.
Safe operating scope
Use only products whose verified AC or DC ratings match the exact application and applicable standard.
Recommended system approach
Define every circuit domain
Mark AC distribution, control power, auxiliary loads and any DC circuits separately before selecting devices.
Protect AC connection points
Select main and branch protection from rated current, conductor capacity and prospective short-circuit current.
Control supporting loads
Apply contactors and control products to suitable pumps, fans, ventilation and auxiliary equipment.
Document boundaries
Record device ratings and circuit type in the BOM and panel labels so AC products are not misapplied on DC circuits.
Product roles within the solution
Molded case circuit breakers
Protection and isolation for suitable low-voltage AC feeders and distribution points.
Final-distribution breakers
Compact AC branch protection for monitoring, communications and supporting building services.
AC contactors
Remote switching for compatible AC auxiliary loads under the system control strategy.
Buttons and control devices
Local command and emergency interfaces for supporting equipment panels.
Typical application areas
Information needed for product selection
Circuit type
Confirm whether each circuit is AC or DC before product selection begins.
Electrical ratings
Maximum operating voltage, frequency, current and prospective fault current.
Source characteristics
Inverter arrangement, source contribution and operating modes relevant to the AC study.
Load profile
Auxiliary load type, switching duty and continuous or intermittent operation.
Installation environment
Indoor or outdoor enclosure, temperature, altitude and ventilation.
Compliance scope
Applicable project standard, approvals, labeling and test-document requirements.
Project benefits
- Clear separation between AC and dedicated DC product scopes
- More accurate device selection from actual circuit data
- Consistent auxiliary-panel product references
- Reduced risk of applying an AC device in an unsuitable DC circuit
