Two series for switchboard tasks
MN — polymer post insulators for switchgear 0.4–6 kV. SM — low-voltage "barrels" made of DMC up to 1 kV with brass insert.
Low-voltage insulators MN and SM
Busbar mounting in LV switchgear, switchboards and MDB
Key features
Materials and mechanics
SM: fiberglass-reinforced molding compound, brass, adapted for hex fasteners. MN: epoxy compound, brass/steel inserts — according to design documentation.
Documentary confirmation
Test reports, batch certificates, GOST and IEC compliance. Full package for acceptance and project documentation.
Quality control and repeatability
100% incoming inspection of batches, eliminating dimensional variation. Packaging in multiples of 10 pcs — convenient for assembly.
Application Context
MN and SM support insulators are installed in low-voltage switchgear (LV switchgear), main distribution boards (VRU), main distribution panels (MDB), and 0.4–1 kV assembly cabinets. MN are additionally used in switchgear up to 6 kV class. The products are in demand among switchgear manufacturers, electrical engineering plants, subcontract assembly for EPC projects, as well as for import substitution tasks with certification framework. METAENERGY insulators — four lines: low-voltage MN/SM, epoxy IO/IP, silicone OSK, and traction IT. Selection — by catalog and design documentation.
Standard Approach
- Confusion between MN and SM leads to mismatched heights and mounting centers — layout rework required
- Selection without considering mechanical load — cracks, busbar loosening
- Incomplete documentation set: acceptance and compliance confirmation are hindered
METAENERGY Solution
- Supply strictly according to specification with batch control, eliminating within-batch variation
- Compliance with rated clamping and bending forces, test reports included in package
- Complete documentation package: certificates, datasheets, test reports for acceptance commission
Industries and typical facilities
Mechanical engineering, chemical and oil & gas, agro-industrial complex, construction and development, infrastructure facilities. Deliveries are made both to switchboard manufacturers and directly to facilities through design organizations.
Below is a detailed overview of the MN and SM series, specifications and advantages that address the listed challenges.
Products
Two complementary series of low-voltage post insulators with complete documentation support.
MN series — polymer post insulators for switchgear up to 6 kV. SM series — low-voltage DMC "barrels" with brass hex-mount inserts. Both product lines are supplied with test reports and certificates.
MN
MN Post Insulators
Polymer post insulators for mounting busbars in power cabinets and assemblies. Used in switchgear rated 0.4–6 kV.
- Housing made of electrical insulating epoxy compound
- Embedded elements — brass or steel ("C" index)
- Height from 25 to 125 mm; modifications by mounting configuration
- Standardized mechanical breaking force for bending and torque per catalog
Selection based on design documentation (KD). Always verify the height and embedded part type against the panel drawing.
SM
Low-voltage insulator SM ("barrel")
Cylindrical post insulators made of DMC with fiberglass for current-carrying busbars in LV switchgear up to 1 kV. Brass embedded part adapted for hexagonal fasteners.
- Material: DMC (Dough Molding Compound) with fiberglass — high strength and arc resistance
- Brass embedded part for hexagonal fasteners — ease of installation
- Wide range of sizes; parameters — according to catalog and data sheet
- Certification, test reports, packaging in multiples of 10 pcs.
Functional equivalent of ABB, Weidmüller products after mandatory verification with the designer. Do not use the term "equivalent" without approval.
Dimensions and Selection
For the MN series, the main dimensions and mechanical characteristics are provided. For the SM series data, please refer to the design documentation and batch certificates.
Main dimensions of MN insulators (catalog fragment)
| Designation | Height, mm | Breaking bending force, kN min | Breaking torque, N·m min | Weight, kg |
|---|---|---|---|---|
| MN 25-000 | 25 | 2,5 | 35 | 0.030 |
| MN 30-001 | 30 | 3 | 40 | 0.045 |
| MN 40-000 | 40 | 3 | 80 | 0.088 |
| MN 50-001 | 50 | 4 | 80 | 0.178 |
| MN 60-001 | 60 | 9 | 100 | 0.258 |
| MN 76-001 | 76 | 3,5 | 100 | 0.228 |
| MN 80-000 | 80 | 7 | 100 | 0.415 |
| MN 125-001 | 125 | — | — | 1.900 |
Comparison of key parameters MN and SM
Both series solve the task of busbar support insulation, but differ in material, voltage class and design features.
| Parameter | MN | SM |
|---|---|---|
| Housing material | Epoxy compound (polymer) | DMC with fiberglass |
| Voltage class | 0.4–6 kV | up to 1 kV |
| Embedded element | Brass or steel (C index) | Brass (hexagonal fastener) |
| Typical designations | MN 60-001, MN 40-000, MN-76-001 | SM 40-000, SM 50-001, SM 76-001 |
| Mechanical load | Standardized by catalog (bending and torsion) | Standardized by passport and design documentation |
| Documentation | By catalog and design documentation | Certification, test reports, passport |
Every batch undergoes inspection
100% incoming inspection of batches, breakdown and mechanical tests, compliance with GOST and IEC. ISO 9001-2015.
Advantages
MN and SM insulators — for LV switchgear and panel assembly with documented GOST and IEC compliance.
Materials and construction
SM — DMC with fiberglass reinforcement, brass hex insert. MN — epoxy compound, brass or steel. Each material is selected to meet mechanical and electrical requirements.
Inspection and testing
100% of batches undergo breakdown and mechanical strength testing. Test reports are included with delivery — suitable for acceptance commissions and certification procedures.
Project documentation
Complete package: certificates of conformity, data sheets, routine and acceptance test reports. Delivery is possible after functional equivalence verification for import substitution.
Additional information for designers
Two product lines for different voltage classes
MN covers 0.4–6 kV, SM — up to 1 kV. Selection from catalog or technical documentation reduces the risk of height selection errors.
SM: DMC and brass
Glass fiber-reinforced molding compound provides arc resistance and mechanical strength. Brass hex insert simplifies tightening and prevents rotation.
MN: polymer and metal made to order
Brass or steel inserts, wide range of heights (25–125 mm) and mounting modifications — precise fit for panel layout.
Proven mechanics
Standardized bending and torque breaking forces — can be used in calculations without "eyeballed" safety margins.
Import substitution after verification
Functional replacement for departed suppliers (reference ABB, Weidmüller) subject to equivalence confirmation by the designer.
Packaging and batch size
SM — quality packaging, packed in multiples of 10 pcs. Convenient for batch assembly and reduces cutting waste during production.
Position in METAENERGY product range
MN and SM insulators are part of an extensive line of insulation solutions for switchgear, busbar trunking, and complete assemblies.
Voltage class
up to 6 kV (MN) / up to 1 kV (SM)
Support insulators for low-voltage and medium-voltage panels, busbar assemblies and cabinets.
Materials
Polymer and DMC
Epoxy compound (MN) and glass fiber reinforced molding material (SM) — select according to operating and assembly conditions.
Available Range
Heights from 25 mm to 125 mm (MN)
For SM, sizes and configurations are available in the catalog. Popular items always in stock.