Chint NM8 NM8S MCCB NM8-250S NM8-400S NM8-630S NM8S-630S NM8-800S NM8S-800S NM8S-1250S CHNT Chint Moulded Case Circuit Breaker
– Chint NM8 Thermal Magnetic type
– Chint NM8S Electronic type
Certificates: CE, DNV, KEMA, UKrSEPRO, EAC, RCC;
Electric ratings: AC50/60Hz, AC220V~690 16A~1600A;
Standard: IEC/EN 60947-2.
| Weight | 2 kg |
|---|---|
| Dimensions | 25 × 25 × 25 cm |
| Rated Current |
16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, 125A, 160A, 180A, 200A, 225A, 250A, 315A, 350A, 400A, 500A, 630A, 700A, 800A, 1000A, 1250A |
| Poles |
2P, 3P, 4P |
Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for CHINT NM8 NM8S Series Moulded Case Circuit Breaker 250A-1250A.
Pure engineering specifications, tripping curve parameters, and electrical selection guidance for panel builders and system designers.
Thermal-magnetic trip units provide fixed or adjustable bimetallic overload and electromagnetic instantaneous short-circuit protection, ideal for standard industrial power distribution. Electronic microprocessor trip units offer precise digital dials for L (Long-time delay overload), S (Short-time delay short-circuit), I (Instantaneous short-circuit), and G (Ground-fault protection), delivering total time-current selectivity in modern switchgear.
Icu represents the absolute maximum fault current the breaker can safely interrupt, after which inspection or replacement may be needed. Ics represents the operational breaking capacity (50%, 75%, or 100% of Icu) that the breaker can clear repeatedly and remain fully operational without performance degradation. In critical healthcare, data center, and continuous industrial applications, specify breakers with Ics = 100% Icu.
A 4P breaker with a switched neutral is required in systems with dual power sources (generator / utility ATS transfer) to prevent circulating neutral currents, in IT distribution networks, and in commercial installations with heavy non-linear harmonic loads (LED drivers, variable speed drives) where neutral conductor current can exceed phase currents.
Direct or extended door rotary handles are specified when the MCCB is enclosed inside switchgear cubicles, providing padlocking and door-interlock safety. Motor operating mechanisms (electric operators) are required for automated SCADA control, remote PLC open/close operations, and automatic transfer switch (ATS) integration.
Standard front connection lugs accept copper or aluminum compression terminals and busbar connections. For high-density panel boards, extended spreader terminals, rear connection studs, and plug-in / draw-out base cassettes are available to facilitate rapid maintenance and modular swap-out.
