The site states components are supplied to overseas switchgear plants in China and Vietnam, and UL-listed breakers and switches are produced for the Americas.
Certifications
ISO 9001, ISO 14001, ISO/TS 16949
About
NS Electric (formerly Sungsin Sanjeon) has produced key parts for power circuit breakers since 1985. From its plants in Ochang, Cheongju, it builds mechanism assemblies for air circuit breakers (ACB), vacuum circuit breakers (VCB) and moulded-case circuit breakers (MCCB), plus withdrawable cradles for medium-voltage switchgear.
The company also carries out OEM production of complete breakers and load interrupter switches, including UL-listed products for the North American market. In-house processes cover precision machining, press work, sheet-metal fabrication, spot and gas welding and CNC automatic riveting, supported by a corporate R&D centre and 3D measuring equipment.
Mechanism assemblies, moving-conductor assemblies and complete OEM air circuit breakers for low-voltage distribution boards, including compact frames that reduce panel size and weight.
Key features
Mechanism assembly handling manual and motor-driven opening and closing
Moving conductor assemblies for main circuits
Compact ACB 800–1600 A in standard, disconnector and current-limiting types
Rating plug for selectable rated current and frequency
Applications
Low-voltage switchboards
Package substations
Building and industrial power distribution
Air circuit breakers 630 A–6300 A (2000/4000/6300 AF frames)
Withdrawable cradles for vacuum circuit breakers and vacuum contactors used in medium-voltage switchgear, available in open, shutter and shutter-and-bushing grades, including heavy-duty versions for power plants.
Key features
Clip-type and tulip-type contacts
E (open), F (shutter) and G (shutter & bushing) grades
Power-plant versions for 40–50 kA duty
Compartment (H-type) cradle with metal segregation
Applications
Medium-voltage switchgear
Power stations
Industrial substations
3.6/7.2 kV 200/400 A VCS cradles; 7.2 kV 630 A–4000 A VCB cradles; E/F/G grades
Sub-assemblies and OEM products for vacuum and moulded-case breakers, such as closing spring assemblies and terminal assemblies, plus UL-listed MCCBs and load interrupter switches.
Key features
VCB closing spring and R/S/T terminal assemblies
UL-listed MCCB 630–1200 A with lug terminals and trip relay
Large-frame MCCB 800–1600 A with communication module options
UL load interrupter switch up to 24 kV / 48 kA
Applications
Breaker OEMs
Cubicle switchgear and capacitor banks
North American distribution equipment
VCB 7.2 kV 12.5 kA–24 kV 50 kA; MCCB 630 A–1600 A; load interrupter switch up to 24 kV 48 kA
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Cheongju, Chungcheongbuk-do, South Korea
