ZW7-40.5 Outdoor Vacuum Circuit Breaker with External Current Transformer (hereinafter referred to as "with CT") is a three-phase AC 50Hz, 40.5kV outdoor medium voltage equipment. It can be used for making and breaking load currents, overload currents, and short-circuit currents. The product features a rational structure and easy maintenance. It is available with optional current transformers, allowing for multiple variations and windings to meet the requirements for metering, measurement, and protection.

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	40.5
2	Rated Frequency	Hz	50
3	Rated Current	A	630/1250/1600/2000/2500
4	Rated Power Frequency Withstand Voltage	kV	85(Wet Testing) / 95(Dry Testing)
5	Rated Lightning 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	Times	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	19±2
2	Contact Overtravel	mm	4±1
3	Average Closing Speed	m/s	0.8±0.2
4	Average Opening Speed (Average Speed of First Opening at 12mm)	m/s	1.7±0.3
5	Rated Contact Pressure	N	3100±200N (25kA/31.5kA) 4800±300N(40kA)
6	Closing Time	ms	30～70
7	Opening Time	ms	20～50
8	Contact Bouncing Duration at Closing Operation	ms	≤3
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

ZW7-40.5 Outdoor Vacuum Circuit Breaker with External Current Transformer has many advantages:

Circuit Breaker Performance

E2-C2-M2

Easy Maintenance

The modular mechanism design allows for the replacement of closing and opening coils without dismantling other components. Users can easily replace the coils, and no testing or adjustment is required after replacement, making future operation and maintenance more convenient.

Standardized Outdoor Design

The porcelain column type meets the pollution level IV environmental standard, with reasonable waterproof and corrosion-resistant performance. It is equipped with an internal condensation controller.

Wide Range of Applications

The product is designed to withstand harsh environments and can endure low temperatures as low as -25°C. It meets the requirements for operation at altitudes of up to 2000 meters. Under special conditions, it can operate in temperatures as low as -40°C and be used at altitudes of up to 4000 meters.

External Current Transformer

The external current transformer can be replaced at any time, allowing for capacity expansion and system upgrades.

Product Applications

ZW7-40.5 Outdoor Vacuum Circuit Breaker with External Current Transformer has many applications:

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

Agricultural grid power system

Substation Static Var Generator (SVG) protection system

Product Outline Drawing

ZW7-405 Outdoor Vacuum Circuit Breaker with External Current Transformer Outline Drawing

Secondary Wiring Diagram

ZW7-405 Outdoor Vacuum Circuit Breaker with External Current Transformer Secondary Wiring Diagram

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Products

ZW7-40.5 Outdoor Vacuum Circuit Breaker With External Current Transformer