Naming Rules for Electronic Molded Case Circuit Breaker Models (e.g., CM3E, NSX E)
Electronic molded case circuit breaker (MCCB) models follow standardized naming conventions that encode key technical parameters, features, and manufacturer-specific designations. While rules vary slightly between manufacturers, they typically include product series, current rating, pole configuration, protection type, and special features. Below is a detailed breakdown using examples like CM3E (CHINT) and NSX E (Schneider Electric):
The first part of the model name usually identifies the manufacturer and product series, indicating the design platform or generation of the MCCB.
Common Manufacturer Prefixes:
ABB: Tmax (e.g., T5N160E: T5 series, N=breaking capacity, 160A, E=electronic).
Siemens: 3VA (e.g., 3VA9630: part of the Sitop series).
Eaton: XN (e.g., XN250E: XN series, 250A, E=electronic).
The model often includes numbers specifying the rated current (In) and short-circuit breaking capacity (Icu).
Example: CM3E-100/3300
100: Rated current (100A).
3: Pole count (3P for three-phase).
300: Breaking capacity or protection features (varies by manufacturer; e.g., "300" may indicate thermal-magnetic trip, but "E" specifies electronic).
Example: NSX E 160N
160: Rated current (160A).
N: Breaking capacity (e.g., N=36kA, H=50kA, L=100kA in Schneider’s NSX series).
Key Symbols for Breaking Capacity:
N: Normal (e.g., 36kA at 400V).
H: High (e.g., 50kA–70kA).
L: Low (e.g., 18kA for residential use).
Model codes specify the number of poles (1P, 2P, 3P, 4P) and protection functions (e.g., electronic trip, 漏电 protection [earth leakage]).
Common Protection Type Codes:
E or ELE: Electronic trip unit (e.g., CM3E, DZ158E).
LE or 30: Earth leakage protection (e.g., DZ47LE, NSX 160LE).
S or SI: Selective coordination (e.g., Tmax T5S).
Additional suffixes or letters indicate optional features or accessories integrated into the MCCB.
Common Feature Codes:
M: High breaking capacity (e.g., "M" for "Maximum").
H: Hybrid (solid-state + mechanical).
C: Communication module (e.g., Modbus, Profibus).
D: Digital display or diagnostic functions.
Schneider NSX E:
NSX: Series name (New System eXtended).
E: Electronic trip (vs. "TM" for thermal-magnetic).
Example: NSX E 400H = 400A, high breaking capacity (H=70kA).
ABB Tmax T5E:
Tmax: Product series (ABB’s premium MCCB line).
T4: Frame size (accommodates 160A–250A).
E: Electronic trip unit.
160: Rated current (160A).
PR222DS: Trip unit model (PR=Protection Relay, 222=advanced electronic, DS=distributed system).
LSIG: Protection functions:
L: Long-time (overload) protection.
S: Short-time (delayed short circuit).
I: Instantaneous short-circuit protection.
G: Ground fault protection.
Manufacturer Series: Identifies the product line and design heritage (e.g., NSX, Tmax).
Current and Breaking Capacity: Numbers and letters specify In (rated current) and Icu (short-circuit rating).
Trip Unit Type: E = electronic; TM = thermal-magnetic; LE = with earth leakage.
Pole Count: 1P, 2P, 3P, or 4P (including neutral).
Special Features: Suffixes for communication (C), high capacity (M/H), or digital functions (D).
By understanding these conventions, engineers can quickly identify an MCCB’s capabilities, ensuring proper selection for applications in residential, commercial, or industrial systems. Always refer to the manufacturer’s technical documentation for precise model specifications.
