Products Overview
The Three Phase Three Wire Energy Metering Block is expertly engineered for standard secondary circuits in three-phase three-wire power metering systems, operating seamlessly with rated voltages up to 660V and rated currents up to 20A. Designed specifically for delta power supplies and ungrounded electrical networks, it features a specialized configurations without a neutral terminal to completely eliminate neutral point drift and prevent L3/N wiring errors.
This high-performance terminal block provides a safe, reliable, and standardized wiring solution for energy meters, electrical instruments, and relay protection devices under load operations. As an ideal updated product for meter enclosures, distribution cabinets, and substations, it guarantees operator safety, prevents energy leakage, and dramatically improves fieldwork efficiency during on-site testing and calibration.
- Premium Polymer Polycarbonate Shell: Manufactured using advanced polymer polycarbonate injection molding. This upgraded material features high impact strength, excellent anti-aging, non-water absorption, and robust flame retardancy. It fundamentally solves the brittle fracturing, moisture degradation, and mildew issues of traditional bakelite, preventing secondary CT leakage and PT breakdown.
- Extreme Temperature Resilience: Rated for a wide temperature performance envelope from -40°C to +120°C, ensuring stable physical and dielectric properties in severe industrial environments.
- Features ultra-low contact resistance (≤0.35 mΩ), reducing heat generation and preventing meter overheating or damage.
- Smart Universal Wiring & Phase ID: Equipped with clear phase sequence identification markings to streamline installation and prevent phase errors. The terminal screws feature a composite groove combination technology , allowing universal compatibility with both flathead and Phillips screwdrivers for faster installation.
- Has a high dielectric strength, withstanding power frequency voltages of ≥3.0kV for 1 minute in three-phase three-wire systems.
- Uses self-locking crimping to maintain strong contact pressure that resists loosening from vibrations.
- Equipped with a transparent cover marked with torque indicators to allow visual torque verification without removal.
- Compatible with most three-phase meters and distribution equipment available in the market.
Technical Specifications
| System Type | Three phase three wire (Delta, no neutral) |
| Rated Insulation Voltage (Ui) | 690V AC |
| Rated Current (Ith) | 10A to 120A (customizable) |
| Short-time Withstand Current | 5kA for 1 second |
| Contact Resistance | ≤0.35 mΩ (initial) |
| Dielectric Strength | ≥3.0kV for 1 minute |
| Wire Size Range | 1.5mm² to 35mm² (copper only) |
| Terminal Type | Cage clamp or tubular screw |
| Housing Material | PA66 with UL94 V-0 flame rating |
| Protection Rating | Standard IP20, optional IP54 |
| Operating Temperature Range | -40℃ to +85℃ |
| Standards Compliance | IEC 60999-1, GB/T 14048.7, CE, RoHS |
Core Product Advantages
Advantages of the Product
Designed exclusively for three-phase three-wire setups, this metering block offers superior reliability compared to standard four-wire terminals. Its neutral-free design eliminates neutral misconnection issues, reducing faults related to neutral point drift. It improves safety by providing isolation protection for live working scenarios, thereby reducing electric shock risks and metering errors. The ultra-low contact resistance lowers temperature rise, safeguarding meters and cables. Its hot-swap capability avoids production downtime and billing discrepancies caused by power interruptions. Installation is straightforward due to compatibility with older models, which helps reduce retrofit and maintenance costs. Adhering to IEC and GB/T standards, this product guarantees stable and durable performance in outdoor and industrial environments.
Extreme Environment Weatherproof & Ruggedized Engineering
Our low-voltage electrical components are specifically engineered to withstand the world's harshest environmental conditions. From coastal industrial zones facing salty, corrosive air to desert solar installations exposed to intense UV radiation and extreme heat, our ruggedized terminal blocks and weatherproof junction boxes deliver uninterrupted performance. We utilize anti-aging, UV-stabilized polycarbonate shells combined with rust-resistant brass or copper alloy conductors treated with specialized surface plating. This ensures high electrical conductivity and prevents galvanic corrosion over decades of service. B2B buyers managing infrastructure projects in mining, chemical processing, marine engineering, or outdoor renewable energy systems can rely on our heavy-duty products to eliminate environmental degradation risks, lower maintenance overheads, and guarantee continuous power distribution stability.
Typical Applications
Metering cabinets and distribution boxes for three-phase three-wire systems
Oilfield pumping units with delta supply and no neutral
Marine shore power systems, especially in salt spray environments and limited spaces
Secondary circuit connections for current transformers (CT) and potential transformers (PT)
On-site meter replacement, calibration, and maintenance without power interruption
Retrofitting older three-phase three-wire distribution panels with compatible mounting
Industrial motors, pumps, and ungrounded electrical systems
Power stations, industrial distribution networks, and urban grid upgrade projects
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