ZW7-40.5 outdoor miniaturized vacuum circuit breaker is a three-phase AC 50Hz, 40.5kV rated voltage outdoor equipment. This product has been developed by our company based on conventional vacuum circuit breakers and is specifically designed as a compact solution for certain customers. It can be used for making and breaking load current, overload current, and short-circuit current. The product features a rational structure and easy maintenance, with the option to equip current transformers, enabling multiple configurations and windings to meet various metering, measuring, and protection needs.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	40.5
2	Rated Frequency	Hz	50
3	Rated Current	A	630/1250/1600/2000
4	Rated Power Frequency Withstand Voltage	kV	85(Wet Testing) / 95(Dry Testing)
5	Rated Lighting Impulse Withstand Voltage	kV	185
6	Rated Short-Circuit Breaking Current	kA	25/31.5
7	Rated Short-Circuit Making Current (Peak)	kA	63/80
8	Rated Withstand Current (Peak)	kA	63/80
9	Rated Duration of Short-Circuit	s	4
10	Operating Cycles at Rated Short-Circuit Breaking Current	Cycles	E2
11	Mechanical Endurance	Times	10000
12	Standard Operating Sequence	-	O-0.3s-CO-180s-CO
13	Allowable Wear Thickness of Contact	mm	≤3

Mechanical Characteristics

No.	Name	Unit	Data
1	Clearance between Moved and Fixed Contact	mm	18±1
2	Contact Overtravel	mm	4±0.5
3	Average Closing Speed	m/s	0.6±0.2
4	Average Opening Speed (Average Speed of First Opening at 12mm)	m/s	1.6±0.2
5	Rated Contact Pressure	N	3100±200N (25kA/31.5kA) 4800±300N(40kA)
6	Closing Time	ms	≤100
7	Opening Time	ms	≤50
8	Contact Bouncing Duration at Closing Operation	ms	≤5
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

ZW7-40.5 outdoor miniaturized vacuum circuit breaker has many advantages:

01.

Performance of the circuit breaker:

E2-C2-M2

02.

Convenient maintenance:

The modular mechanism design allows for easy replacement of the closing and opening coils without the need for dismantling other components. This eliminates the need for testing or adjustment after replacement, ensuring users to replace them independently, making subsequent maintenance more convenient.

03.

Compact design:

The product volume is significantly reduced compared to vacuum circuit breakers of other manufacturers, facilitating transportation and on-site installation.

04.

Wide range of applications:

Designed to withstand harsh environments, the product can endure temperatures as low as -15°C and meet usage requirements up to an altitude of 1000 meters. Under special requirements, it can operate at temperatures as low as -40°C and altitude up to 2000 meters.

Product Applications

Outdoor 110kV or 220kV substation, 35kV transmission and transformation power line

Agricultural grid power system

Substation Static Var Generator (SVG) protection system