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Outdoor Ring Main Unit
Ambient temperature: -45℃~ 45℃
Altitude: ≤4000m
Humidity: average relative humidity
Shanghai Mac Corporation is a leading manufacturer and supplier of eletrical devices in China, who possesses strong capabilities in design, R & D, production, sales and service in the field of intelligent power distribution and consumption.
The series of outdoor ring main unit products are designed in a unified way to provide customers with a variety of cabinet types (circuit breaker cabinet, load switch cabinet, load switch, fuse combination electrical cabinet, metering cabinet, PT cabinet, bus cabinet, bus joint cabinet, etc.) , and they're identical in size and shape. The switchgear can be assembled on the spot and expanded at will, which avoids the transportation and installation inconvenience brought by multi assembled cabinets. It has absorbed a large amount of advanced foreign technology and adopted high-tech components from both domestic and foreign sources, and its performance fully meets various national standards. Its connection combination method is simple, convenient, flexible, and has properties such as full insulation, full enclosure, corrosion resistance, maintenance free, safety and reliability. It is widely used in power distribution networks.
If you want to know more about our ring main unit, or other related products, please feel free to contact us, we will reply you within 24 hours.
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Load Switch Cabinet |
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Test Item |
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Rated Voltage (kV) |
12 |
Rated Short time Power frequency Withstand Voltage (kV) |
Dry test: 42Wet test: 42 |
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Rated Current (A) |
630 |
Rated Lightning Impulse Withstand Voltage (kV peak) |
75 |
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Rated Frequency (Hz) |
50 |
Rated Short time Power frequency Withstand Voltage (across break) (kV) |
Dry test: 48Wet test: 48 |
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Rated Active Load Breaking Current (A) |
630 |
Rated Lightning Impulse Withstand Voltage (across break) (kV peak) |
85 |
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Rated Short circuit Making Current (kA peak) |
63 |
Main Circuit Resistance (C V) (μΩ) |
≤300 |
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Duration of Rated Short time Withstand Current (main circuit) (s) |
4 |
Closing Operating Voltage (Max/Rated/Min) (V) |
DC 242 / 220 / 187 |
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Rated Short time Withstand Current (main circuit) (kA) |
25 |
Opening Operating Voltage (Max/Rated/Min) (V) |
DC 242 / 220 / 143 |
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Rated Peak Withstand Current (main circuit) (kA peak) |
63 |
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Circuit Breaker Cabinet |
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Test Item |
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Rated Voltage (kV) |
12 |
Rated Short time Power frequency Withstand Voltage (across break) (kV) |
48 |
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Rated Current (A) |
630 |
Rated Lightning Impulse Withstand Voltage (across break) (kV peak) |
85 |
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Rated Frequency (Hz) |
50 |
Rated Cable charging Current (A) |
25 |
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Rated Short circuit Breaking Current (kA) |
25 |
Closing Operating Voltage (Max/Rated/Min) (V) |
DC 242 / 220 / 187 |
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Rated Short circuit Making Current (kA peak) |
63 |
Opening Operating Voltage (Max/Rated/Min) (V) |
DC 242 / 220 / 143 |
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Rated Short time Power frequency Withstand Voltage (kV) |
42 |
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Rated Lightning Impulse Withstand Voltage (kV peak) |
75 |
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Standard Packaging
Each unit of outdoor solid dielectric ring main unit is fixed on a heavy duty steel base. Key components are wrapped with anti dust PE film and bubble foam to avoid scratch, moisture and collision. Vulnerable parts such as operating handles, auxiliary connectors and accessories are individually packed in separate inner boxes. Complete equipment is housed in reinforced export plywood cases with shock absorbing padding inside. Corner protectors are fitted on case edges to resist impact during handling and transit. For bulk shipments, multiple plywood cases are firmly strapped onto fumigated wooden pallets for container loading.
Shipping
We support FCL and LCL sea freight, air freight, as well as project specific over land trucking, subject to order quantity and destination country. Available trade terms include EXW, FOB, CIF, DAP and other Incoterms upon customer request. Freight cost is calculated according to cargo volume, gross weight, delivery destination and selected transport mode.
Lead Time
Samples / prototype unit: 7 12 working days (standard configuration) Standard orders (regular specifications): 20 35 working days Custom orders (custom cabinet size, special protection grade, intelligent modules, non standard parameters): 35 55 working days
Q1: What is the main difference between outdoor RMU and indoor RMU?
A: The outdoor ring main unit is designed for direct outdoor installation without building an indoor distribution room. It adopts weather‑proof cabinet with higher environmental adaptability against rain, dust and temperature change. Indoor RMU must be placed inside buildings and cannot be exposed to open‑air conditions.
Q2: Is this solid‑dielectric outdoor RMU maintenance‑free?
A: The high‑voltage solid‑insulated switching parts are fully sealed and maintenance‑free for cleaning. Only the operating mechanism requires regular visual inspection and lubrication according to operation manual. Routine overhaul of internal solid‑insulated modules is not required.
Q3: What environment can the outdoor RMU adapt to?
A: It fits urban commercial districts, industrial parks, mining areas and metallurgical sites. The cabinet can work under wide temperature range, anti‑dust and anti‑rain. Not suitable for strong corrosive gas environment without extra anti‑corrosion treatment.
Q4: Can this outdoor RMU support smart‑grid upgrade?
A: Yes. The unit reserves installation positions for sensors and intelligent communication interfaces. Customers can add intelligent monitoring modules later to realize remote signal collection and status monitoring for smart grid application.
Q5: What operating mechanisms are available for selection?
A: Two types of operating mechanisms are optional: spring operating mechanism and permanent‑magnet operating mechanism, to meet different customer project requirements.
Q6: What are the main rated parameters of this outdoor ring main unit?
A: Standard rated voltage 12 kV, rated current 630 A. Short‑circuit breaking current 25 kA for circuit breaker cabinet. Customized specifications can be provided upon customer’s technical tender documents.
Q7: Can different cabinet types be combined on‑site?
A: Yes. Load switch cabinet, circuit breaker cabinet and other functional units can be combined flexibly on‑site to realize ring‑network power supply or sectionalized power supply according to actual distribution scheme.
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