What Do The Circuit Breaker Model Symbols Mean?

Publish Time: 05/22 2025 Author: Site Editor Visit: 26

Lv Pole Mounted Circuit Breakers Meaning of model symbols

About the meaning of circuit breaker model symbols, according to the provisions of national technical standards, the circuit breaker model is generally composed of text symbols and numbers, including the model and symbol description of low-voltage circuit breakers and high-voltage circuit breakers.

Meaning of circuit breaker model symbols

At present, according to the provisions of national technical standards, the circuit breaker models in my country are generally composed of text symbols and numbers in the following way.

Its representative meaning is:

① Product letter code, represented by the following letters:

S-low oil circuit breaker;

D-high oil circuit breaker;

K-air circuit breaker

L-sulfur hexafluoride circuit breaker;

Z-vacuum circuit breaker

Q-gas circuit breaker

C-magnetic blow circuit breaker.

②-installation location code:

N-indoor;

W-outdoor.

③-design series sequence number:

indicated by the numbers 1, 2, 3-.

④Rated voltage, KV.

⑤Other supplementary working characteristic marks:

G-improved type;

F-phase operation.

⑥Rated current, A.

⑦Rated breaking current, KA.

⑧Special environment code.

Low voltage circuit breaker:

DW10 series frame type automatic switch;

DWX15, DWX15C series universal current limiting circuit breaker;

DW17 (ME) series universal circuit breaker;

DZ10 series plastic case automatic switch;

DZ15 series plastic case circuit breaker;

DZX10 series plastic case current limiting circuit breaker;

DZ20 series plastic case circuit breaker;

DZ25 series plastic case circuit breaker;

High voltage Circuit breakers:

DW series high-voltage outdoor installation oil-rich circuit breakers;

SW series high-voltage outdoor installation oil-poor circuit breakers;

SN series high-voltage indoor installation oil-poor circuit breakers;

ZW series high-voltage outdoor installation vacuum circuit breakers;

ZN series high-voltage indoor installation vacuum circuit breakers;

LW series high-voltage outdoor installation SF6 circuit breakers;

LN series high-voltage indoor installation SF6 circuit breakers;

Note: 1. Some models here are now out of production, but some are still installed and in use. 2. Foreign introduction, joint venture models, etc. are not included.

Supplement:

ZW32-12/630-20,

Z-----Vacuum circuit breaker

W-----Outdoor

32-----Design serial number

12-----Voltage level 10KV (applicable to systems with a rated voltage of 10KV)

20-----Breaking current KA

HNV1-12/630-25,

HN-----Enterprise code

V------Vacuum circuit breaker

1------Design serial number

12-----Voltage level 10KV (applicable to systems with a rated voltage of 10KV)