High-voltage compartment

Prefabricated substation generally adopted load switch with fuse to protect the substation, any phase of fuse is melt, three-phase will trip together, load switch may be air-pressed type, vacuum type, SF6 type for choice, which can be operated by motor mechanism; fuse is current limiting type with striker, breaking reliably, high interrupting capacity. For the distribution transformer exceeding 800KVA, it can choose ZN12,ZN28, VS1 or other vacuum breaker for protection and control.

Low-voltage compartment

Main switch in low voltage compartment adopted universal or intelligent type circuit breaker, outgoing switch use moulded case circuit breaker: small size, short arcing distance, various outgoing lines, intelligent reactive compensation device has two switching modes for choice: switching by contactors, or without contacts.

Transformer

Prefabricated substation may select S9、S10、S11 series low loss, oil-immersed, hermetically sealed distribution transformer, or resin epoxy type or NOMEX paper insulated environment protected dry type transformer.