ZW7-40.5 Outdoor High Voltage Vacuum Circuit Breaker

Category：

Outdoor High-voltage Vacuum Circuit Breakers
Browse number：

45
Release time：

2025-03-12 08:13:20
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Detailed Description

ZW7-40.5 outdoor Pole mounted high-voltage vacuum Circuit Breaker is an Outdoor High-voltage Switchgear with a rated voltage of 12kV and three-phase AC 50Hz. Mainly used for breaking and closing load current, overload current, and sho比-circuit current in power systems. Suitable for protection and control in substations, industrial and mining enterprises, and urban and rural distribution networks,especially suitable for places with frequent operations and urban network automation distribution networks. mis product is compatible with the controller and can meet the requirements of the distribution automation system, while also reliably andefectively completing the traditional recloser function. It adopts a mature box type sealing structure and is ﬁlled with SF6 gas inside, which has good sealing peformance and is not afected by the external environment. It is a maintenance free product. Its spring operated mechanism adopts a direct acting chain main transmission and a multi-stage trip system, with high reliability of action, making it a good product for column mounted circuit breakers.

1.Model and meaning

2.Main technical parameters

Number	Project	Unit	Parameter
1	Rated voltage	kV	40.5
2	Rated current	A	1600
3	Rated frequency	Hz	50
4	Rated short-circuit breaking current (effective value)	kA	20	25	31.5
5	Rated short-circuit closing current (peak)		50	63	80
6	Rated peak withstand current		50	63	80
7	4s rated short-time withstand current (effective value)		20	25	31.5
8	1-minute power frequency withstand voltage (effective value)	kV	Dry: 95 (Wet: 80)
9	Lightning impulse withstand voltage (peak value)		185
10	Rated operating sequence	kV	Split -0.3s -180s - Split
11	Rated short-circuit breaking current breaking times		20
12	Mechanical lifespan	Once	10000
13	weight	kg	1000

3.Main mechanical characteristic parameters

Number	Project	Unit	Parameter
1	Arc extinguishing chamber contact opening distance	mm	22±2
2	Arc extinguishing chamber contact overtravel		5±1
3	Interphase center distance		710
4	Bounce time of arc extinguishing chamber contact closing	ms	≤5
5	Three phase asynchronous opening and closing		≤2
6	Average closing speed	m/s	0.75±0.2
7	Average opening speed		1.7±0.2
8	Closing time	ms	30~100
9	Opening time		15~60
10	Main circuit resistance of each phase (excluding current transformers)	Once	≤100
11	Allowable wear thickness of dynamic and static contacts in vacuum arc extinguishing chamber	kg	3

4.Appearance and installation dimensions

Main parameters of circuit breaker

Circuit Breaker Main Parameters

A circuit breaker is an essential electrical safety device used to protect electrical circuits from damage caused by overloads or short circuits. It automatically disconnects the power supply in the event of a fault, preventing fire hazards, equipment damage, and ensuring the safety of electrical systems. The main parameters of a circuit breaker include:

Rated Voltage
The rated voltage is the maximum voltage a circuit breaker can safely handle. It is crucial for determining the application and installation environment of the breaker. Circuit breakers are available for low, medium, and high-voltage systems.
Rated Current
Rated current refers to the maximum continuous current that the circuit breaker can carry without tripping. It is typically specified in amperes (A). The rated current is important for selecting the correct breaker size to avoid nuisance trips.
Breaking Capacity
Breaking capacity, also known as short-circuit breaking capacity, is the maximum fault current the circuit breaker can safely interrupt without being damaged. This is measured in kiloamperes (kA). A higher breaking capacity is necessary for circuits with large potential fault currents.
Tripping Characteristics
Tripping characteristics describe how a circuit breaker reacts to overcurrent conditions. Common types are:

Thermal: Triggers based on time and temperature for overload protection.
Magnetic: Triggers instantly when a short circuit occurs, protecting against immediate damage.

Operating Mechanism
Circuit breakers can have either a manual or automatic operating mechanism. Manual breakers require human intervention for resetting, while automatic breakers reset themselves after a fault is cleared, offering convenience and reducing downtime.
Poles
The number of poles indicates how many separate electrical circuits a breaker can control. Single-pole breakers are used for single-phase circuits, while multi-pole breakers (e.g., two-pole, three-pole) are used for three-phase circuits.
Interrupting Time
Interrupting time is the time it takes for the breaker to disconnect the circuit once a fault is detected. A shorter interrupting time helps prevent damage to electrical equipment.
Auxiliary Contacts
These contacts are additional features that allow external signals to be generated when the breaker trips or operates. They are used for monitoring or control purposes in complex systems.
Service Life
The service life of a circuit breaker is the number of operations it can perform before requiring maintenance or replacement. A higher service life is indicative of better reliability and durability.
Mounting Type
Circuit breakers can be mounted in various ways, including panel mounting or DIN rail mounting, depending on the application and space constraints.

By understanding these parameters, you can select the right circuit breaker for your application, ensuring both safety and efficient operation of your electrical system.

Conclusion
Circuit breakers are vital for protecting electrical systems from damage and ensuring safety. Understanding their key parameters—such as rated voltage, current, breaking capacity, and tripping characteristics—helps in selecting the right model for your needs, enhancing both reliability and safety in electrical installations.