Switchgear parts: what buyers need from the mould
Switchgear parts are the insulating components that hold and separate live conductors in breakers, panels and distribution boards: insulators, busbar supports, terminal blocks, MCB enclosures and breaker housings. They are usually compression moulded from DMC, BMC or Bakelite because these thermosets resist heat, arcing and tracking and keep their shape under load.
Switchgear makers need parts that pass dielectric, glow-wire and tracking tests every batch, with brass inserts and threads that line up with the busbars. That depends on dense, void-free moulding, which depends on the mould.
Most switchgear parts are small and made in large numbers, so multi-cavity moulds with balanced heating and individual loading wells are common. Larger parts such as MCB panel boxes and MCB enclosures are often SMC.
Switchgear part moulds we build
What a switchgear part mould must deliver
Dense, void-free parts
Correct charge, venting and pressure so parts pass dielectric and tracking tests without porosity.
Insert accuracy
Brass inserts and threads held square by pins and pockets, so busbars and screws line up on assembly.
Creepage ribs and barriers
Thin ribs and barriers that keep creepage distances, cut by EDM so DMC and BMC fill them cleanly.
Multi-cavity balance
Every cavity at the same temperature and charge, so parts are identical across the mould.
Materials and mould design
Small switchgear parts are mostly DMC, BMC or Bakelite; larger MCB enclosures and panel boxes are often SMC. We help you choose the compound in the DFM.
Every mould starts with a free DFM review: draft, wall section, shear edge, charge placement and press tonnage are checked before steel is cut. Read more about compression moulds and the moulding process.
