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SRM61-40.5 fully insulated and sealed metal-enclosed switchgear

The SRM61-40.5 series switch is a completely sealed system. Its main circuit switch body and various live parts are enclosed in a stainless steel shell filled with pressurized SF6 gas. The entire switch device is unaffected by the external environment, ensuring reliable operation and personal safety, and achieving maintenance-free operation.

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Ring network switch device series

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Product Description

　　The SRM61-40.5 series switch is a fully sealed system. Its main circuit switch body and various live parts are enclosed in a stainless steel housing filled with pressurized SF6 gas. The entire switchgear is unaffected by the external environment, ensuring reliable operation and personal safety, and achieving maintenance-free operation.

　　The SRM61-40.5 series switch includes load switch units (C), circuit breaker units (V), etc. Different modules can be combined in various ways by selecting expandable busbars or common boxes, achieving full modularity. The expansion busbar is fully insulated and shielded, ensuring high reliability and safety. The rich module combinations meet the needs of both network nodes and end users, and also meet the needs of various secondary substations for flexible use of compact switchgear.

　　SF6 gas-insulated ring main unit switchgear is a switching device used in distribution systems to perform control, protection, measurement, monitoring, and communication functions. Due to its small size, maintenance-free operation, and the fact that the main circuit is unaffected by the external environment, this type of switchgear is particularly suitable for applications with high reliability requirements and relatively harsh natural environments and conditions, such as underground, plateau, and coastal areas. It is widely used in industrial and mining enterprises, wind power generation, and photovoltaic power generation.

　　This product complies with relevant national technical standards, including GB/T3804 "3.6kV~40.5kV High-Voltage AC Load Switches", GB/T1984 "High-Voltage AC Circuit Breakers", GB/T1985 "High-Voltage AC Isolating Switches and Earthing Switches", GB/T3906 "3.6kV~40.5kV AC Metal-Enclosed Switchgear and Control Equipment", and GB/T11022 "Common Technical Requirements for High-Voltage Switchgear and Control Equipment Standards".

Technical Advantages

　　1. Fully Insulated and Sealed Design: The primary live parts (main busbar) and switch body of the SRM61 series switchgear are sealed in an air tank welded from stainless steel plates. The main circuit is connected to the outside through bushings installed on the air tank that conform to DIN47636 standards. It can be connected to incoming and outgoing cables via fully insulated and shielded separable connectors. The air tank has an IP67 protection rating. The interior of the air tank is unaffected by the external environment and has short-term flood and dew condensation resistance.

　　2. Flexible and Expandable Design: SRM61 series switchgear can be combined into fixed ring main unit switchgear with a common box that is not expandable using various standard unit modules (up to 6 units in a common box within the same SF6 insulated air tank). Different modules can also be combined into expandable units, and multiple forms can be achieved through dedicated fully insulated and shielded busbar connectors, achieving full modularity. This maximizes the ability to meet the needs of different regions, forms, and customers, providing diverse power supply and distribution design schemes.

　　3. High Safety and Reliability: The primary live parts and switch body are sealed in a stainless steel air tank and connected to the outside via bushings, avoiding direct contact with live parts; the equipment has reliable pressure relief devices and pressure relief channels to ensure the safety of personnel and equipment in the event of a fault.

　　4. High Mechanical Reliability: It features a spring operating mechanism developed and manufactured in-house. Quality control of the mechanism is implemented throughout the entire process, from design, production, to running-in and debugging, ensuring the reliability and stability of the mechanism. A complete mechanical interlocking device is included to prevent misoperation to the greatest extent possible. This provides a high-quality operating mechanism solution for SRM61 series switchgear and similar SF6 gas-filled switchgear.

Technical Parameters

Serial Number	Item					Unit	Load Switch	Circuit Breaker
1	Rated Voltage					kV	40.5	12
2	Rated Frequency					Hz	50	50
3	Rated Current					A	630	630
4	Rated Insulation Level	1min Power Frequency Withstand Voltage			Phase-to-Phase, Phase-to-Ground	kV	95	95
					Break		118	118
					Control and Auxiliary Circuits		2	2
		Lightning Impulse Withstand Voltage			Phase-to-Phase, Phase-to-Ground		185	185
		Lightning Impulse Withstand Voltage			Break		215	215
5	Partial Discharge Quantity at 1.2Ur					pC	≤20	≤20
6	Rated Short-Time Withstand Current					kA/S	25/4	25/4
7	Rated Peak Withstand Current					kA	63	63
8	Rated Short-Circuit Closing Current					kA	--	63
9	Rated Short-Circuit Breaking Current					kA	--	25
10	Rated Active Load Breaking Current					A	630	--
11	Mechanical Life		Load Switch/Circuit Breaker			Times	5000	10000
11	Mechanical Life		Isolating/Earthing Switch			Times	3000	3000
12	Loop Resistance					μΩ	≤150	≤150
13	Rated Gas Pressure (Gauge Pressure at 20℃)					MPa	0.04	0.04
14	Annual Relative Gas Leakage Rate					Year	≤0.01%	≤0.01%
15	Protection Class			Cabinet			IP4X	IP4X
15	Protection Class			Air Tank			IP67	IP67
16	Gas Moisture Content					μL/L	≤150	≤150
17	Arc Test					kA/s	25/1
18	Insulating Gas					/	SF6

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