ZCW10-40.5 Open Type Combined Electrical Apparatus High Voltage Reliable Durable Power Distribution Equipment

The ZCW10-40.5 Open Type Combined Electrical Apparatus provides high-voltage, reliable, and durable power distribution solutions. Designed for efficient energy management and seamless electrical protection, it supports open-type configuration for easy maintenance, robust performance, and long-term operational stability, making it ideal for industrial substations and high-voltage power distribution networks.

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Structural Features

The circuit breaker has an outdoor compact floor-mounted tank-type structure, equipped with a CT35 spring operating mechanism. The mechanism is integrally mounted with the body, ensuring simple installation, easy commissioning, and reliable operation, making it suitable for frequent operations. The mechanism’s lifespan exceeds 10,000 operations.

It adopts a compressed air arc-extinguishing structure with strong breaking capability. It can interrupt 40 kA of fault current up to 12 times, setting a domestic record. The sealing performance is reliable, using imported sealing gaskets. The dynamic seal employs a “V”-shaped sealing ring with a spring pressure compensation structure. The secondary wiring board for the current transformer is supplied by a joint venture, ensuring an annual leakage rate of <0.5%.

The internal current transformers use microcrystalline alloy materials with high magnetic conductivity, and the accuracy class can reach 0.2 or 0.2S. Based on user requirements, up to 12 current transformers can be included. It is capable of handling no-load long lines of up to 50 km without reignition.

Main Technical Parameters of Circuit Breaker

No.	Parameter Name	Unit	Parameter Value
1	Rated voltage	kV	40.5
2	Rated insulation level	kV	185 (lightning impulse, full wave peak) / 95 (power frequency, 1 min)
3	Rated current	A	2000
4	Mechanical life	Times	10,000
5	Rated SF6 gas pressure (20℃ gauge pressure)	MPa	0.5
6	Alarm/minimum functional pressure (20℃ gauge)	MPa	0.45
7	Rated short-circuit breaking current	kA	40
8	Rated short-circuit making current (peak)	kA	100
9	Rated short-time withstand current (thermal)	kA	40
10	Rated short-time withstand current (dynamic)	kA	100
11	Rated out-of-step breaking current	kA	10
12	Accumulated breaking times (rated short-circuit)	Times	12
13	Rated short-circuit duration	s	4
14	Closing time (rated operating voltage)	s	≤0.15
15	Opening time (rated operating voltage)	s	≤0.06
16	Rated operating sequence	–	O—0.3s—CO—180s—CO*
17	Rated switching current (single capacitor bank)	A	400
18	SF6 gas annual leakage rate	%/Year	≤0.5
19	SF6 gas moisture content (V/V)	ppm	≤150×10⁻⁶
20	Rated operating voltage (CT14 spring mechanism)	–	See notes
21	Closing/Opening coil voltage	V	DC 110/220
22	Energy storage motor voltage	V	AC 220/380; DC 110/220
23	SF6 gas weight	kg	8
24	Circuit breaker weight (including mechanism)	kg	1400