8058 series explosion-proof miniature circuit breakerDetailed product description：

Purpose
8058 is used for protection and isolation of distribution motors in electrical circuits with AC 50Hz and voltage of 380V or below.

8058 series explosion-proof small circuit breaker model meaning



The product guarantees reliable operation under the following conditions
a) Altitude not exceeding 2000m;
b) The ambient air temperature shall not be higher than+40 ℃ and not lower than -20 ℃;
c) The relative humidity of the surrounding air is not greater than 95% (at+25 ℃);
d) During normal operation, explosive gas mixtures of Class IIC T5, T6 and below may occur in places;
e) In places without rain or snow invasion;
f) A place that can prevent water and other liquids from entering;
g) Places without significant shaking and impact vibration;
h) The pollution level is level 3;
i) The installation category is Class III;

Technical data of 8058 series explosion-proof miniature circuit breaker
The work schedule is an 8-hour work schedule;
The rated short-circuit breaking capacity is 6KA;
The maximum cross-sectional area of the connecting wire of the explosion-proof circuit breaker is 10m ㎡;
The explosion-proof circuit breaker adopts explosion-proof and rubber sealed structure, with explosion-proof markings of Exd Ⅱ CT5 and Exd Ⅱ CT6;
The agreed heating current of the explosion-proof circuit breaker is shown in Table 1;

Table 1 Agreed heating current

Temperature group T	T5	T6
Current A	20,25,30,401)	1,3,6,10,16

The rated working voltage Ue of the explosion-proof circuit breaker is shown in Table 2, with a rated frequency of 50Hz.

Table 2 Rated working voltage

U6	380V	220V
Overload characteristics	B. C and D B,C and D	B and C B and C
polar number	2P,3P,3P+N	1P+N,2P

The rated current of the explosion-proof circuit breaker is shown in Table 3
Table 3 Rated Current

Rated current A	1,3,6,10,16	20,15,30,401)
Temperature Class	T6	T5

Note: 1) is an explosion-proof isolator

Explosion proof circuit breakers can also be used for limited motor protection with a fixed rated current of 16A or less, and their breaking capacity meets the requirements of Table 4.
Table 4 Switching Capacity

Usage category	On-off conditions
AC-3	1C/1e	Ur/Ue	COS Ф
	eight	one point zero five	zero point four five

The type, current range, and time of the thermal release of the explosion-proof circuit breaker are specified in Table 5.
Table 5 Tripping Current

Types of Warm Release Devices	Tripping current value	tripping time
B	＞3In～5In	3In≥0.1s 5In<0.1s
C	＞5In～10In	5In≥0.1s 10In<0.1s
D	＞10In～20In	10In≥0.1s 20In<0.1s