This 12KV circuit breaker with disconnector in the environmental friendly switchgear, features a semi-encapsulated structure and offers advantages such as uniform electric field, reliable interruption, long service life, maintenance-free operation, and easy installation. Primarily used in environmentally friendly air-insulated ring main unit cabinets, it serves as the primary component within the cabinet, responsible for closing and opening the main circuit, closing and opening rated load currents, and closing and interrupting short-circuit currents.

This circuit breaker has passed all tests required by the standard, including the breaking and closing test (including E2-level electrical life test), short-time withstand current and peak withstand current test, high/low temperature test, mechanical life (M2-level), capacitive current opening and closing test (C2-level), insulation test under zero gauge pressure, partial discharge test, and main circuit 1.1 times rated continuous current temperature rise test.

Standards

GB/T 1984 High Voltage AC Circuit Breaker
DLT 402 High-voltage AC circuit breaker
GB/T 1985 High-voltage AC disconnectors and grounding switches
DL/T 486 High-voltage AC disconnector and grounding switch

Environmental condition

1) Ambient Temperature: Maximum +40°C, Minimum -15°C (Storage and transportation at -30°C permitted);

2) Altitude: ≤ 2000 meters;

3) Ambient Humidity: Daily average relative humidity < 95%, monthly average relative humidity ≤ 90%;

4) Earthquake Intensity: Not exceeding 8 degrees;

5) Operating Location: No flammable or explosive hazards, no water vapor, no chemically corrosive gases, and no severe vibration.

NOte: For special operating conditions that differ from normal operating conditions, buyers should inform the manufacturer. For example, when electrical equipment is installed at an altitude of 2000 meters or above, this must be specifically noted so that we can make adjustments during production.

Product Parameters

No.	Item	Unit	Data	Note
1	Rated voltage	KV	12
2	Rated current	A	60
3	Rated breaking current / Thermal stabilization time	KA/S	20/4; 25/3
4	Rated peak withstand current	KA	50/63
5	Rated short-circuit making current	KA	50/63
6	Short circuit closing times	Time	30
7	Power frequency withstand voltage: to ground/between phases	KV	42	In dry air or N₂
8	Power frequency withstand voltage:	KV	48	In dry air or N₂
9	Lightning impulse: to ground/between phases	KV	75	In dry air or N₂
10	Lightning strike: fracture	KV	85	In dry air or N₂
11	Main circuit resistance	μΩ	≤60
12	Mechanical life of arc extinguishing chamber	Time	10000
13	Mechanical life of isolation/earthing switch	Time	10000
14	Air tank pressure	bar	1.25

Dimension

product-2067-955

Product application

Environmentally friendly gas cabinets are designed to minimize environmental impact and improve gas efficiency.

The insulating gas in environmentally friendly gas-insulated ring main cabinets (GIRCMs) is either natural gas (such as nitrogen or dry air, with trace amounts of SF6 prohibited) or synthetic gas (such as C4, C5, and their mixtures). They utilize energy-saving technologies and a high-efficiency filtration system to reduce gas usage and handling costs, as well as minimize gas leaks and emissions.

With growing global awareness of environmental protection, market demand for environmentally friendly gas cabinets is increasing. Environmentally friendly gas cabinets effectively prevent chemical volatilization and contamination of indoor environments and are widely used in laboratories, chemical plants, and other fields. In developed countries in particular, environmentally friendly gas cabinets have become essential laboratory equipment, resulting in strong market demand in these regions.