Indoor High-Voltage Load Switch-Fuse Combo (FZRN35-40.5D )

Indoor Medium-Voltage Load Switch-Fuse Combo (FZRN35-40.5D )

Indoor Medium Voltage AC Vacuum Load Break Switch-Fuse Combination devices (referred to as "combination devices") is a type of switchgear specially developed for new energy fields such as wind power and photovoltaics. It is widely used in 30KV(40.5KV) combined transformers, prefabricated substations, and similar applications. It features high breaking capacity, safety and reliability, long electrical endurance, frequent operation capability, and minimal maintenance. It can protect transformers from overload and prevent equipment from running in a phase-deficient condition. The combination devices includes a visible isolation break and a grounding switch with closing capabilities, and it can be equipped with an electric spring mechanism for remote operation. Environmental Conditions: Temperature: Upper limit +40°C, lower limit -40°C, daily average temperature not exceeding 35°C. Humidity: Daily average not exceeding 95%, monthly average not exceeding 90%. Water Vapor Pressure: Daily average not exceeding 22kPa, monthly average not exceeding 1.8kPa. Altitude: <3500m. Installation Site: Surrounding air should not be significantly contaminated by dust, smoke, corrosive or flammable gases, vapors, or salt fog. Electromagnetic Interference: Electromagnetic interference induced in the secondary system should not exceed 1.6kV.

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Feature

Utilizes vacuum arc extinction, providing strong arc-extinguishing capability and long electrical endurance.

Features a rear-mounted isolating switch design, facilitating operation, maintenance, and installation.

Combines load switch, isolation, and grounding functions into a compact, reliable, and stable structure.

Equipped with high-voltage current-limiting fuses for comprehensive short-circuit protection.

Uses a dedicated spring-operated mechanism with low energy consumption and capability for frequent operation.

Compact size, easy installation, and simple operation.

Parameter

Number	Tech. parameters		Unit	Combination switches	Load switches	Grounding switches
1	Rated voltage		KV	40.5	40.5	40.5
2	Rated current		A	100A and below	1250
3	Rated frequency		Hz	50	50	50
4	Rated short-circuit breaking current		KA	31.5A and below	一	一
5	Rated short-circuit making current		KA	一	80	80
6	Rated peak withstand current		KA	一	80	80
7	Rated short-time withstand current		KA	一	31.5	31.5
8	Rated transfer current		A	1700	一	一
9	Rated active load breaking current		A	一	1250	一
10	Rated closed-loop breaking current		A	一	1250	一
11	Rated cable charging current		A	一	21	一
12	Rated duration of short-circuit		S	一	4	4
13	Rated voltage of Secondary circuit operating		V	Dc220	Dc220
14	Rated short duration (1 min)	Control, auxiliary circuits	KV	2	2	一
	Power frequency withstand voltage	Main circuit		Inter-electrode center, ground-to-ground and vacuum fractures 95
		Main circuit		Isolation fracture 110
	Rated lightning impulse withstand voltage (peak)			Inter-electrode center, ground-to-ground and vacuum fractures 185
15	Rated lightning impulse withstand voltage (peak)		KV	Isolation fracture 215
16	Main loop resistance		μQ	≤400 (Combination Appliances Except Fuse)

Number	Tech. parameters	unit	Vacuum interrupter	isolated knife valve	grounding knife valve
1	Clearance between open contacts	mm	17±1	≥350	≥300
2	Contacts overtravel	mm	5±1	一	一
3	Average opening speed	m/s	1.5±0.2	一	一
4	Average closing speed	m/s	0.6±0.2	一	一
5	Rated contacts pressure	N	1000±150	260±30	390±150
6	Out of simultaneity	ms	≤2	一	一
7	Contacts closing bounce duration	ms	≤3	一	一
8	Inter-electrode center distance	mm	450±3	450±3	450±3
9	Cumulative thickness of contact wear	mm	3	一	一
10	Deviation distance of the contact closing position	mm	一	≤2	≤2
11	Mechanical life	times	10000	2000	2000

The electric parameters of the CT21 Spring operating mechanism equipped with the vacuum isolation load switch (-fuse combination electrical device). Permanent magnet single-phase DC energy storage motor

Model	Rated voltage	Rated output power	Normal operating voltage range
ZYJ220-53	-220	≤30W	80%~110% rated voltage
Opening solenoid (independent power supply)
Rated Operating Voltage (V)	-220	-110	-220
Rated Operating Voltage (V)	2.67	2.93	2
Rated electric power(W)	<587	<312	440
201 Coil resistance value (n)	30±3	17±1.7	110±10
Normal operating voltage range	65%~120 rated working voltage is reliably opened, less than 30% rated working voltage shall not be opened