In 24kV medium-voltage switchgear, the contact box is compact yet mission-critical. Positioned at the primary busbar-to-circuit interface, it carries full rated current while ensuring robust isolation between high-voltage conductors and the earthed cabinet enclosure. For the widely deployed KYN28A-24 indoor switchgear, this component is foundational to overall distribution reliability. Manufactured via the APG (Automatic Pressure Gelation) epoxy molding technique, our 24kV contact box delivers bubble-free insulation and repeatable electrical characteristics. From substation projects and industrial retrofits to solar farm collector networks, it offers the dielectric strength and mechanical ruggedness that demanding applications require.

Product Specifications

Specification Sheet

S.N	Item	Data
1	Rated voltage	24kV
2	Rated current	630/1250/1600/2000/2500/3150A
3	Frequency withstand voltage	42kV/5min
4	Rated lightning impulse withstand voltage	75kV peak value(Contact to ground)
5	Partial discharge	≤5pC(1.1xUn下)
6	Temperature rise test	Long-term operation end temperature rise ≤ 65K (in line with GB/T 11022 standard)
7	Bending strength	≥150MPa(Epoxy resin material)
8	Insulation resistance	≥10⁹Ω(normal),≥10⁸Ω(After being wet)
9	Creepage distance	≥300mm(Standard type),≥400mm(Enhanced)
10	Tensile strength	≥80MPa(Contact connection part)
11	operating temperature	-10℃~+40℃(normal),-25℃~+40℃(Low temperature type)
12	relative humidity	≤95%(No condensation at 20℃)
13	altitude	≤1000m(normal),2000m(Plateau type optional)
14	pollution level	Ⅲ level(Insulation design needs to be strengthened)
15	Protection level	IP4X
16	Standard certification	GB/T 11022(General technical requirements for high-voltage switchgear)
		DL/T 404(Technical conditions for ordering indoor AC high-voltage switchgear)
		IEC 62271-200(General specification for high-voltage switchgear)