ZW32-40.5 Outdoor Miniaturization Vacuum Circuit Breaker | High Voltage Power Protection | Chennuo Electric-Chennuo Electric Technology Group Co., Ltd

Feature

The circuit breaker features a three-phase pole structure, consisting of three poles, a mechanism box, and internal transmission components. It utilizes a maintenance-free spring mechanism housed in a fully sealed mechanism box. This ensures the circuit breaker is waterproof and moisture-resistant for outdoor use. It also offers stable and reliable breaking performance without the risk of combustion or explosion. The entire circuit breaker boasts a compact size, light weight, maintenance-free operation, and a long service life.

The electronic current transformer (sensor) employed offers numerous advantages, including excellent insulation, compact size, light weight, wide frequency response, no saturation, and excellent electromagnetic interference resistance. Utilizing the LPCT low-power coil principle, low-voltage signals are directly connected to secondary equipment. This technology is widely used for phase and zero-sequence current metering, measurement, and protection signal sampling, reducing errors and simplifying system architecture.

The electronic voltage sensor used is a new type of sensor for measuring phase voltage and zero-sequence voltage protection. It employs advanced capacitive voltage division technology to convert high voltage into a low-voltage signal. By calculating this low-voltage signal, phase and zero-sequence voltage data are accurately collected. Because it contains no iron core, it is immune to saturation and offers a wide frequency range, a large measurement range, excellent linearity, and strong anti-interference capabilities. Short-circuiting the secondary voltage output prevents overcurrent and ferromagnetic resonance, eliminating potential major faults in the power system and ensuring the safety and stability of personnel and equipment.

The isolating switch and the circuit breaker body can be added to form a circuit breaker + isolating switch combination appliance. The circuit breaker body and the isolating switch have a reliable mechanical interlocking device. Function to prevent misoperation

Parameter

Tech. parameters	Unit	Value
Rated voltage	KV	40.5
Rated current	A	630/1250
Rated frequency	Hz	50/60
Power frequency withstand voltage 1min (wet) (dry) between phases, to ground/break	KV	80 95/95
Lightning impulse withstand current (peak) between phases, to ground/break	KV	185
Rated short-circuit breaking current	KA	20/25/31.5
Rated short-circuit making current (peak value)	KA	63/80
Rated peak withstand current	KA	63/80
4s short-time withstand current	KA	25/31.5
Rated operating cycle		Open - 0.1s - Close Open - 6s Close Open - 60s Recover
Rated short-circuit current breaking times	times	30
Mechanical life	times	10000
Mechanism control voltage	V	AC/DC220
Secondary circuit 1min power frequency withstand voltage	KV	2
Contact opening distance	mm	18±1
Contact overtravel	mm	4±0.5
Opening speed	m/s	1.4-1.8
Closing speed	m/s	0.4-0.8
Contact closing bounce time	ms	≤5
Phase center distance	mm	560±2
Three-phase opening and closing with different phases	ms	≤2
Closing time	ms	≤100
Opening time	ms	≤50
Weight	KG	Without isolation 300/with isolation 380

Typical Application Scenarios:

Outdoor Power Distribution Networks (40.5kV): Designed for 40.5kV three-phase AC 50Hz outdoor distribution systems.
Feeder Automation Systems: Serves as an ideal device to realize distribution line feeder automation, handling fault detection, judgment, and processing.
Overload & Short-Circuit Protection: Used to break overload currents and short-circuit currents on overhead lines.

Operating Environment Conditions:

Ambient Temperature: Maximum temperature +50℃, minimum temperature -40℃, maximum daily temperature difference 35K.
Relative Humidity: Daily average <95%, monthly average <90%.
Altitude: Below 2500m.
Wind Speed: Not exceeding 35m/s (equivalent to wind pressure 700Pa).
Pollution Level: Class IV.
Ice Thickness: 10mm.

Key Features & Technical Advantages:

All-in-One Integrated Design: Integrates the switch body, power-fetching unit, measurement unit, and control unit into a single system for simple installation and easy maintenance.
High-Accuracy Current-Voltage Sensors: Equipped with unified standardized parameters for current-voltage integrated sensors, featuring wide measurement range, high measurement accuracy, and high reliability.
Comprehensive Analog Quantities: Provides complete analog quantities to accurately judge and handle various line faults.
Feeder Automation Ready: Built specifically to support distribution line feeder automation systems for detection, judgment, and processing.

Why Choose Chennuo Electric?

Advanced Secondary Fusion Technology: Combines precise measurement and automated control into a unified pole-mounted unit, reducing external wiring and enhancing grid intelligence.
Extreme Weather Resilience: Engineered to withstand harsh outdoor conditions, including low temperatures down to -40℃, heavy ice（10mm）, and Class IV heavy pollution levels.
Rigorous Quality Standards: Manufactured to provide reliable fault isolation and high-precision monitoring for modern smart power distribution networks.
Responsive Technical Support: Backed by professional engineering teams ready to assist with custom parameters, environment evaluations, and global export logistics.

Frequently Asked Questions (FAQ)

Q1: What is a secondary fusion pole-mounted circuit breaker?
A: It is an integrated outdoor distribution device that combines the switch body, power-fetching unit, measurement unit, and control unit to handle current breaking, fault detection, and feeder automation.

Q2: What type of sensors are configured in the ZW32-40.5?
A: It is configured with unified, standardized-parameter current-voltage integrated sensors that feature a wide measurement range, high accuracy, high reliability, and comprehensive analog quantities.

Q3: What are the environmental limits for temperature and altitude?
A: The standard operating temperature ranges from -40℃ to +50℃ with a maximum daily temperature difference of 35K, and it is rated for altitudes below 2500m.

Q4: What should be done if our site conditions exceed the standard environment parameters?
A: If your actual usage environment conditions differ from the specified parameters (such as higher altitude or specific pollution levels), the user and the manufacturer need to negotiate custom solutions.