12kv Sf6 Free Ring Main Unit Solid Insulated Switchgear Eco Friendly Environment Protection

Overview 

The Ring Main Unit delivers a new generation of environmentally friendly power distribution for 12kV three-phase AC systems. This advanced solid insulated switchgear (SIS) uses fully sealed epoxy resin encapsulation, eliminating SF6 gas entirely. As a result, this sf6 free rmu operates safely across extreme temperatures, coastal humidity, and high-altitude plateau environments. Furthermore, its modular architecture supports both indoor and outdoor deployment in a ring type distribution network, and is suitable for various application scenarios.

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Product Features

• SF6-Free Solid Insulation:This electrical rmu uses epoxy resin to fully encapsulate live components, eliminating greenhouse gas risk entirely.

• Zero-Maintenance Full Sealing :The Medium Voltage Switchgear adopts APG-process epoxy bushings with silicone rubber sealing at every connection point.

• Flexible Modular Design:This mvsg supports free combination of circuit breaker, load switch, and combined apparatus units per project need.

• Five-Prevention Interlocking Safety:Every Electrical Switchgear module meets five-prevention interlock requirements with visual isolation-fracture windows for safe verification.

• IAC-Compliant Arc Fault Protection:Each rmu switchgear cabinet features a directional pressure-relief valve that safely discharges internal arc faults into the cable trench.

• Smart Grid Ready:This Medium Voltage Ring Main Unit supports remote control, remote measurement, and remote communication via an intelligent controller interface.

• High-Performance Vacuum Breaking:The Power Factor Correction Device—combined with copper-chromium contacts and R-shaped longitudinal magnetic field technology—achieves a 25kA short-time withstand current rating and 10,000 mechanical operations for the circuit breaker.

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Application Scenarios

1.Urban Distribution Substations & Compact Secondary Stations

Challenge: Space-constrained city centers require SF₆-free gear to meet air quality mandates (e.g., London LEZ).

SIS Role:

• Zero-gas design eliminates F-gas reporting/taxes (EU 517/2014)

• 40% smaller footprint vs. AIS, fits basements/car parks

• IP67-rated solid barriers prevent flashovers in polluted/damp environments

2.Hyperscale Data Centers & Edge Computing Sites

Challenge: Strict PUE targets, zero tolerance for SF₆ leaks near critical IT loads.

SIS Role:

• SF₆-free insulation aligns with RE100 commitments (Google/Amazon)

• V0-rated fire-resistant epoxy eliminates arc-flash propagation risks

• -40°C to +65°C operation ensures server-farm microclimate stability

3.Heavy Industrial Plants (Steel/Mining/Chemical)

Challenge: Conductive dust/corrosive vapors degrade conventional switchgear.

SIS Role:

• Hermetically sealed modules block salt, sulfide & metal particulates

• IEC 62271-3 Class 2 seismic resilience for high-vibration zones

• No SF₆ gas monitoring, 35% lower OPEX vs. GIS

4.Port Electrification & Offshore Renewables

Challenge: Salt spray/100% humidity trigger insulation failures.

SIS Role:

• Corrosion-proof encapsulation passes ISO 9227 salt-mist testing

• Pressurization-free design avoids explosion risks at sea level/altitude

• Shock/vibration resistance for floating solar/wind installations

5.Hospitals & Tunnel Power Networks

Challenge: Critical infrastructure requires fire-safe, non-toxic gear.

SIS Role:

• Zero-toxicity decomposition (even during arc faults)

• Limited ventilation compatible for underground deployments

• Passive cooling operation eliminates HVAC dependency

Technical parameter

Item		Unit	Data
Rated voltage		kv	12
Rated current		A	630
Rated short-time withstand current (4s)		kA	25
Rated peak withstand current		kA	50
Rated short-circuit closing current (peak)		kA	50
Rated active load breaking current		A	630
Rated closed loop breaki ng current		A	630
Rated cable charge breaking current		A	10
Rated breaking transfer current of combined appliances		A	3700
1 min power frequency withstand   voltage	Phase-   to-phase, phase -to- ground, vacuum breaking	kv	42
	Insulation breaking	kv	48
Lightning impact withstand voltage	Phase-   to-phase, phase -to- ground, vacuum breaking	kV	75
	Insulation breaking	kv	85
Mechanicallife	Circuit breaker	Time	10000
	Insulation knife, grounding knife	Time	3000
Protection grade			IP4X
Shell protection grade			IP4X
Partial discharge		PC	≤20(Measured at   1.2Ur)

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Technical parameter

Potential   transformer capacity kVA	Fuse model	Fuse   rated current (A)
		Voltage class 12kV	Voltage class 63kV
100	XRNT-12kV	10	16
125	XRNT-12kV	10	20
160	XRNT-12kV	16	20
200	XRNT-12kV	20	25
250	XRNT-12kV	25	31.5
315	XRNT-12kV	31.5	40
400	XRNT-12kV	40	50
500	XRNT-12kV	50	63
630	XRNT-12kV	63	80
800	XRNT-12kV	80	100
1000	XRNT-12kV	100	125
1250	XRMT-12kV	125	-

Product structure diagram

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