ZW20-12/T Outdoor High Voltage Vacuum Circuit Breaker

Overview

The ZW20-12/T □ - □ Series Outdoor High-Voltage Vacuum Circuit Breaker (hereinafter referred to as the circuit breaker) is an outdoor power distribution device designed for a rated voltage of 12kV and a three-phase AC 50Hz power system. This product utilizes vacuum arc extinguishing technology and SF6 gas as the insulating medium, representing an improved version of the ZW20-12F column-mounted vacuum circuit breaker. The breaker box features VSP5's advanced gas sealing, explosion-proof, and insulation structural technology, significantly enhancing the sealing performance of the inlet and outlet line ducts. The overall sealing efficiency is exceptional, ensuring that the SF6 gas inside remains leak-proof and unaffected by external environmental conditions.

The spring operating mechanism has been miniaturized and optimized for improved reliability and stability. It adopts a direct-acting chain main drive and a multi-stage tripping system, greatly surpassing the reliability and stability of traditional domestic spring operating mechanisms. The contact structure between the shaft and sleeve of the main circuit uses an inward-retracted and outward-stretched chain design, minimizing contact resistance and reducing temperature rise. As a result, the ZW20-12F outdoor pole-mounted vacuum circuit breaker is a maintenance-free product and stands out as one of the best pole-mounted circuit breakers available.

Compared to the ZW20-12F, the ZW20-12 series includes additional features such as overcurrent protection, mechanism spring energy storage indication, and an aviation socket for secondary electrical connections, making it easier to integrate with intelligent controllers. With its excellent electrical and mechanical properties, the ZW20-12F outdoor pole-mounted vacuum circuit breaker is widely used. It is primarily used for breaking and closing load currents and short-circuit currents in 10kV power systems. The breaker is ideal for protection and control in substations and industrial power distribution systems, particularly in areas with frequent grid operations. When paired with the appropriate controller, the ZW20-12F provides superior recloser functionality, meeting the demands of distribution automation systems.

Technical Parameters

NO.	Items		Unit	Date
01	rated voltage		kV	12
02	Rated frequency		Hz	50
03	Rated current		A	630	1000
04	Rated short-circuit breaking current		kA	20	25
05	Rated peak withstand current		kA	50	63
06	Rated short-time withstand current		kA	20	25
07	Rated short-circuit closing current		kA	50	63
08	Rated operating sequence			O-0.3s-CO-180s-CO
09	Mechanical lifespan		次	10000
10	Rated current breaking times		次	10000
11	Rated short-circuit breaking times		次	30
12	power-frequency withstand voltage 1min	(Wet) alternating, facing the ground	kV	34
		(Dry) alternating, facing ground/fracture surface	kV	42/48
13	Lightning impulse withstand voltage	Interphase, to ground/fracture surface	kV	75/85
14	Secondary circuit 1-minute power frequency withstand voltage		V	2000
15	quality		kg	About 140
16	Contact opening distance		mm	9
17	Contact stroke of contacts		mm	3
18	Average opening speed		m/s	1.2±0.2
19	Average closing speed		m/s	0.6±0.2
20	Rated operating voltage		V	AC/DC220
21	Rated pressure of SF6 gas (gauge pressure)		MPa	0