OEM SafeRing-40.5 Gas Insulated Ring Main Unit (RMU) -SF6 Sealed Switchgear Supplier, Company

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OEM SafeRing-40.5 Gas Insulated Ring Main Unit (RMU) -SF6 Sealed Switchgear Supplier, Company

Gas Insulated Ring Main Unit (RMU) is compact high-performance SF6 sealed medium-voltage switchgear built for dependable power distribution. Equipped with SF6 gas insulation, it provides outstanding arc-quenching performance, low maintenance requirements and high safety even in limited spaces. Supporting both ring-main and radial network configurations, this modular RMU allows flexible grid integration and can be installed indoors or outdoors. It effectively blocks external contamination to extend service life and reduce operation risks. Compliant with IEC and IEEE standards, it delivers stable performance under harsh conditions, widely adopted in urban power grids, industrial facilities and renewable energy projects.

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Product Description

Type Designation

1	Manufacturer Code
2	Model Type
3	Rated Voltage: 40.5 Rated voltage 40.5KV
4	Cabinet Type: C: Load Switch Cabinet; F: Fuses Switchgear Cabinet; V: Vacuum Circuit Breaker Cabinet; M: Measuring cabinet; SV, SL, Bus Sectionalizing Switchgear; PT: PT Cabinet (Co-enclosure cabinet composed of any combination of C, F, V, S, VSL.)
5	Rated Current: 2500 Rated Current 2500A; 3150 Rated Current 3150A
6	Expansion Type: I: Left Extension; D: Right Extension; ID: Both Sides; Blank: extendable
7	Cable entry/exit method: L: Left; R: Right; LR: Both; Blank: Front

Product Display

Technical Parameters

Name				Unit	Parameter
Rated voltage				kV	12	40.5
Rated current				A	1250-3150	1250-2500
Rated frequency				Hz	50
Rated short-time withstand current				k/Vs	25,31.5
Rated peak withstand current				kA	63,80
Rated short-circuit current duration				s	4
Rated short-circuit breaking current				kA	25,31.5
Rated short-circuit making current				kA	63,80
Duration of arcing				S	0.5
Mechanical life		Circuit breaker		Times	2000	10000
		Isolating switch			3000
		Earthing switch			3000
Electrical life of circuit breaker				Times	30
Rated inflation pressure(20℃ gauge pressure)				MPa	0.05
Minimum functional pressure(20℃ gauge pressure)				MPa	0.03
Annual leakage rate of SF₆gas					≤0.5%
Rated insulation level	Rated power frequency 1min withstand voltage(effective value)		Phase to phase	kV	42	95
			Isolation fracture,vacuum fracture		48	118
	Rated lightning impulse withstand voltage(peak value)		Phase to phase		75	185
	Rated lightning impulse withstand voltage(peak value)		Isolation fracture,vacuum fracture		85	215
Auxiliary control circuit		Rated voltage		V	DC:110,220 AC:110,220
Auxiliary control circuit		1min power frequency withstand voltage		V	2000
Cabinet protection grade		Cabinet shell			IP4X
Cabinet protection grade		Inflatable compartment		-	IP65
Category of loss of operation continuity				-	LSC2B
Temperature rise test				A	1.1lr
Main circuit resistance		1250		μΩ	85	100
		2000				65
		2500			60	60
		3150			50
Partial discharge		Test voltage		kV	1.1×12/√3	1.1X40.5/√3
		Single insulating element		pC	≤3
		Complete machine		pC	≤50
Service life				Year	≥30

Outline and Structure Diagram of Switch Cabinet

1. Small bus room	11. CM-35 arrester
2. Instrument room	12. Pressure release channel
3. Inflatable compartment of main bus	13. Cable plug
4. Station disconnector	14. Cable socket
5. Operating mechanism room	15. Test socket plug
6. Circuit breaker	16. Test socket
7. Inflatable compartment of circuit breaker	17. Branch bus
8. Cable chamber	18. Pressure relief device
9. Current transformer	19. Main bus
10. Cable	20. Bus coupler socket
	21. Bus coupler
Note: a (cabinet width): 600mm, 800mm; b (cabinet depth): 12kV depth is 1420; The depth of 40.5kV is 1620.

Ordering Notice

Product operating site and special requirements:

Provide product ordering drawings, which should include wiring diagrams and indicate transformer capacity, main component model specifications, distribution branch circuits, and capacity.
When it is necessary to configure electric energy metering and reactive power automatic compensation devices, the requirements for the configuration of the metering meter and transformer should be provided, and the capacity of the compensation capacitor should be indicated.
Specify the requirements for surface treatment of the product.

Frequently Asked Questions (FAQ)

What are the available rated voltage levels for this switchgear?

This product series is available in both 12 kV and 40.5 kV rated voltage options.

What is the ingress protection (IP) rating of the switchgear?

The cabinet enclosure provides an IP4X protection grade, while the gas-inflatable compartment meets an IP65 protection level.

What is the expected service life and annual gas leakage rate?

The switchgear is engineered with an expected operational service life of at least 30 years, and an annual SF₆ gas leakage rate maintained at or below 0.5%.

What cabinet unit configurations can be combined?

The system supports modular combinations including Load Switch Cabinets (C), Fuse Switchgear Cabinets (F), Vacuum Circuit Breaker Cabinets (V), Measuring Cabinets (M), Bus Sectionalizing Switchgear (SV, SL), and PT Cabinets.

What dimensions are typical for the 12kV vs 40.5kV cabinets?

Cabinet widths are typically 600mm or 800mm. The standard depth is 1420mm for the 12kV configuration and 1620mm for the 40.5kV configuration.

What critical information must be provided when placing an order?

Orders require wiring drawings indicating transformer capacity, component specifications, distribution branch circuits, energy metering/compensation requirements, and surface finish instructions.

OEM SafeRing-40.5 Gas Insulated Ring Main Unit (RMU) -SF6 Sealed Switchgear Supplier, Company

Product Description

Type Designation

Product Display

Technical Parameters

Outline and Structure Diagram of Switch Cabinet

Ordering Notice

Frequently Asked Questions (FAQ)

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