Yes. We include a breaker coordination study with every SMDB order. Provide your upstream MDB breaker curves and we verify selectivity. The nearest breaker to the fault trips first. The upstream breakers hold. We ship the selectivity study as part of the documentation package.
160A to 630A incoming. Copper busbar with silver plating. Schneider or ABB MCCB main breaker. MCBs and RCCBs for outgoing circuits. Floor-standing for 400A and up, wall-mounted for 160A to 250A. Every board is IEC 61439 type-tested.
A main distribution board handles the whole building at 400A to 4000A with ACB or large MCCB incoming. A sub distribution board handles a zone at 160A to 630A with MCCB incoming. The SMDB sits one level below the MDB in the hierarchy and feeds lighting panels, small MCCs, and floor-level distribution boards.
CE certified, IEC 60831 type-tested at an accredited laboratory. Every stage has its own HRC fuse link — one capacitor fault isolates only that stage. The rest of the bank keeps running. Mechanical door interlock prevents access to live busbar. Built-in discharge resistors meet IEC 60831 safety requirements. We configure regional compliance — SASO, SNI, GOST — for your destination market.
Standard range is 380V to 690V, 50kVAR to 1000kVAR. Step sizes are typically 25kVAR or 50kVAR. We build custom ratings for 220V systems and special high-ambient-temperature sites. Every capacitor stage uses polypropylene film dielectric with built-in discharge resistor — drains to below 50V in under 60 seconds after disconnection.
What is APFC panel sizing? It is the process of matching total kVAR and step sizes to your load profile — too few steps and you under-correct at low load, too many and the contactors cycle unnecessarily. A good apfc panel manufacturer builds each stage with its own fuse and contactor, uses polypropylene film capacitors with discharge resistors, and type-tests the complete bank to IEC 60831. Zhegui has been doing exactly this since 2013.
An APFC panel is an automatic capacitor bank — the controller reads voltage and current 50 times per second and switches capacitor stages as the load changes, preventing both under-correction and over-correction. A good apfc panel supplier provides IEC 60831 test reports for every stage, uses HRC fuse links per stage, and offers controller programming support. If the supplier hesitates on test reports, find another one.
Start with your 12-month utility bills. Average PF and peak kVA demand determine the kVAR correction you need. A 500kVA plant at 0.75 PF needs roughly 200kVAR to reach 0.95. Our capacitor bank for power factor correction spans 50kVAR to 1000kVAR in 25kVAR or 50kVAR steps. Send us your bills and single-line diagram for a free sizing calculation with payback estimate.
