Metal-Enclosed Load-Interrupter Switchgear
Compact, weatherproof medium-voltage switchgear for feeder switching and transformer protection. Load-break switches and current-limiting fuses for indoor and outdoor pad or skid installations.
Compact MV Switching for Feeder Distribution
Metal-enclosed load-interrupter switchgear combines load-break switches and current-limiting fuses in a compact, weatherproof enclosure — suitable for pad mounting, skid mounting, or installation in underground vaults and distribution substations.
- Gang-operated or independent load-break switches per section
- Current-limiting fuses for transformer and feeder protection
- Outdoor NEMA 3R weatherproof enclosure (IP54 or better)
- Suitable for pad, skid, or vault installation
- Accessible cable termination compartments (elbow type)
- IEEE C37.20.3 and CSA C22.2 compliant
What's Included
- Load-break switches — gang or independent operation
- Current-limiting fuses for transformer protection
- Outdoor weatherproof enclosure (NEMA 3R / IP54)
- Accessible elbow-type cable termination compartments
- Full-voltage switch ratings (continuous and load-break)
- Ground-and-test switch option for safe maintenance
- Stainless steel hardware for corrosion resistance
- Padlockable switch handles per NFPA 70E
- Nameplate and warning labels per ESA requirements
- +Motor-operated switch actuators (remote SCADA operation)
- +Fault indicator LEDs with self-resetting capability
- +Remote monitoring SCADA gateway (Modbus RTU/TCP)
- +Additional cable termination bay/section
- +Fuse-saving scheme with upstream recloser coordination
- +Stainless steel 316L enclosure for marine/coastal environments
- +Overhead line arresters and wildlife guards
- +Vault or underground installation package
Full Specifications
| Parameter | Value |
|---|---|
| Voltage Class | 5 kV, 15 kV, 25 kV (27.6 kV BIL) |
| Switch Current Rating | 200 A, 400 A, 600 A, 900 A, 1200 A |
| Fault Closing Rating | Up to 20 kA symmetrical (switch-rated) |
| Fuse Type | Current-limiting (CLF), power, or arc-strangling |
| Enclosure Type | NEMA 3R standard; NEMA 4X stainless available |
| Installation | Pad-mount, skid, vault, or surface |
| Cable Termination | Elbow connectors (200 A or 600 A class) |
| Operating Mechanism | Manual; motor-operated SCADA option |
| Bus Material | Copper, tinned contact surfaces |
| Standards | CSA C22.2, IEEE C37.20.3, IEEE C37.74 |
| Lead Time | 6–12 weeks typical |
Built to Standard
Where It's Used
- Pad-mounted switching for underground distribution networks
- Industrial feeder switching and transformer protection
- Renewable energy MV collector switching
- Mining surface distribution for feeder sectionalizing
- Commercial plaza and campus MV switching
- Utility loop schemes and normally-open tie points
- Oil field and pipeline station distribution
- Transit and rail yard switching
From design and specification through factory testing, commissioning, and ongoing maintenance — Candron delivers at every phase.
- Engineering drawings and coordination studies
- Factory acceptance testing (FAT) with full reports
- Site commissioning and protection settings
- Spare parts, training, and maintenance support
Common Questions
Load-interrupter switchgear is simpler, more compact, and cost-effective for applications requiring feeder switching and transformer protection without automatic reclosing or complex protection relay functions. Metal-clad with VCBs is preferred when fault interrupting capability, arc-resistant options, or protective relaying are required.
Yes. Our standard enclosures are NEMA 3R (weatherproof) and can be pad-mounted or skid-mounted in outdoor environments. NEMA 4X stainless steel enclosures are available for coastal, marine, or extreme weather installations.
Load-break switches can interrupt normal load current but are not rated to interrupt fault current. The current-limiting fuses (CLF) in the same compartment handle fault interruption. This combination covers the full range of normal and fault conditions without requiring a circuit breaker.
Ready to Spec
Your Project?
Our engineering team responds with specs, lead times, and pricing the same day. Tell us what you need:
- Nominal voltage class and number of switch sections
- Load-break switch current rating per section
- Transformer kVA (for fuse sizing)
- Available fault current (kA) at the feeder
- Pad-mount, skid, or vault installation
- Motor-operator and SCADA requirements
Send us your project details and we'll respond with a price, lead time, and any clarifying questions — typically within a few hours.
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