Product Overview & Application

The Three Phase Four Wire Metering Block is a highly specialized low-voltage terminal assembly engineered for standard secondary circuits in electric energy metering installations. It provides a secure, reliable, and standardized connection interface between multi-functional energy meters, current transformers (CT), potential transformers (PT), and relay protection devices.

Widely implemented in power grid substations, industrial factory distribution boards, commercial solar PV grid-ties, and residential meter enclosures, this block is the industry standard for implementing safe, centralized multi-circuit wiring.

Engineering Innovation & Material Integrity

Uncompromising Shell Material

Moving away from obsolete brittle bakelite, HASICB utilizes high-molecular-weight Polycarbonate (PC) injection molding. The shell boasts UL94 V-0 flame retardancy, exceptional dielectric strength ($\ge 3.0$kV/min), and superior impact resistance. It guarantees no water absorption, zero mildew growth, and zero tracking under severe outdoor utility conditions.

Tamper-Evident Anti-Theft Design

Features a high-transparency, impact-resistant protective cover integrated with dual-lead sealing screw slots. This gives utility companies and energy managers an instant visual inspection mechanism while establishing a highly effective physical barrier against unauthorized access and electricity theft.

Ergonomic Universal Wiring

Terminal screws are upgraded with composite groove technology, accepting both flathead and Phillips screwdrivers. Clear, laser-etched color-coded phase sequence markings guarantee error-free installation during high-volume grid modernization rollouts.

Ultra-Low Contact Resistance for Enhanced Thermal Protection

Extremely low initial contact resistance (≤0.35 mΩ) drastically reduces heat generation, particularly in the neutral circuit, safeguarding the meter from thermal damage.

Technical Specifications

System Compatibility	Three-phase four-wire (wye with neutral)
Rated Insulation Voltage (Ui)	400 V / 690 V AC
Rated Current (Ith)	5 A – 20 A
Neutral Terminal Rating	Identical to phase terminal rating
Short-Time Withstand Current	5 kA / 1 s
Contact Resistance	≤0.35 mΩ (initial)
Dielectric Strength	≥2.5 kV / 1 min
Conductor Cross-Section	1.5 mm² – 16 mm² (copper conductors only)
Termination Style	Cage clamp or tubular screw
Housing Material	PC, UL94 V-0 flame rating
Ingress Protection	IP20 (standard), IP54 (optional)
Operating Temperature Range	-40 °C to +85 °C
Standards Compliance	IEC 60999-1, GB/T 14048.7, CE, RoHS

product key technologies

01.

Typical Applications

- Three-phase four-wire metering panels and distribution enclosures (with neutral connection)
- Secondary circuit wiring for CTs and PTs in wye configurations
- Hot-swap meter exchange, accuracy verification, and maintenance without service interruption
- Commercial and industrial photovoltaic grid-tie cabinets (400 V)
- Distribution automation cubicles and data center power panels
- High-voltage supply, high-side metering customer retrofit projects
- Power stations, industrial distribution networks, and urban grid modernization
- Standardized wiring and safety protection for metering installations

02.

Grid-Grade Metering Joint Junction Box Solutions

We specialize in engineering and manufacturing premium electric energy metering joint junction boxes designed to optimize safety and precision in modern grid infrastructure. Our specialized metering terminal blocks are specifically developed to resolve complex wiring challenges, reduce secondary circuit measurement errors, and facilitate hassle-free field testing inside standard utility metering cabinets. Built to withstand demanding electrical loads, these units offer reliable phase-sequence management and secure wire clamping mechanism. They are widely utilized by state power utilities, green energy contractors, and electrical panel builders globally. By supplying these grid-grade metering components at wholesale quantities, we help overseas utility procurement departments enhance electrical measurement safety while preventing unauthorized access, ensuring long-term stable performance in residential, commercial, and industrial power monitoring applications.