Description

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Product Overview

The three phase interference connector 100A is a 100 A metering interface built to hold a three-phase measuring circuit steady when the load is heavy. Each phase contact sits inside its own shielded chamber, so conducted noise and injected signals stay out of the metering path instead of passing through the contact point.

That shielding is what separates it from a plain terminal block. On a conventional bar terminal the contact points are open, and a bypass device or stray coupling can reach the live contact and distort the reading. Here the chamber wall, the anti-tamper keying and the sealable points together form the interference barrier.

Load capacity is sized to match. The contacts are high-conductivity copper alloy with precision tin plating, holding initial contact resistance at ≤0.5 mΩ, and the screw-clamp termination accepts copper conductors up to 35 mm². Tested to IEC 60947-7-1, temperature rise stays below 45 K at rated current, so 100 A can be carried continuously.

Technical Specifications

Values below are the standard configuration. Confirm each line against your meter panel schedule or drawing before release.

Parameter	Value
Rated Current	100 A
Rated Voltage	380 V / 400 V AC (three phase)
Phases	3
Conductor Range	Copper, up to 35 mm²
Termination	Screw-clamp
Temperature Rise	< 45 K at rated current (IEC 60947-7-1)
Contact Resistance	≤0.5 mΩ (initial)
Withstand Voltage	AC 2500 V / 1 min, no breakdown
Insulation Resistance	≥100 MΩ at 500 V DC
Contact Body	High-conductivity copper alloy, precision tin plating
Housing	Flame-retardant PC, UL94 V-0
Housing Heat Rating	Structural integrity maintained up to 120 °C
Interference Barrier	Shielded contact chamber per phase; anti-tamper keying; sealable points
Customization	OEM / ODM supported per customer drawings
MOQ	Depends on configuration; trial orders negotiable
Quality Guarantee	12–24 months from shipment date
Manufacturing Standard	ISO 9001 quality management system
Packaging	Standard export packaging
Delivery Ports	Ningbo Port / Shanghai Port
Quote Turnaround	Within 24 hours

Core Advantages

Four design points decide whether a 100 A three-phase feed can be metered accurately in a busy panel.

Wide Product Range

Each phase contact is enclosed in its own insulated chamber. An external probe cannot reach the live contact, and noise conducted in from neighbouring switching equipment does not couple onto the measuring circuit.

Contact Resistance Held At ≤0.5 mΩ

Tin-plated copper alloy keeps the joint stable through thermal cycling, so the small voltage drop the meter relies on does not creep upward with age or with the next re-torque.

Under 45 K Rise At Continuous 100 A

Generous conductor cross-section and terminal mass limit self-heating. Verified to IEC 60947-7-1, that headroom is what lets a 100 A load run continuously without the accuracy drift that heat brings.

Anti-Tamper Keying And Sealable Points

Physical polarization blocks reverse or incorrect insertion, and the integrated sealing points accept utility security seals, so any later access is visible at the next inspection round.

Wire Cage Terminal vs Traditional Brass Terminal

The gap between this connector and a traditional brass terminal shows up in the contact interface, and again at the first re-torque.

Point Of Comparison	Screw-Clamp Terminal (This Connector)	Traditional Brass Terminal
Contact chamber	Each phase contact enclosed in an insulated chamber	Open contact points, reachable by a probe
Interference path	The chamber separates the measuring circuit from external noise	No shielding; an injected signal reaches the contact directly
Conductor seating	Screw clamp bearing on a broad face of a 35 mm² conductor	Bare screw on a round post; the conductor has to be wrapped
Contact resistance	≤0.5 mΩ initial and stable at 100 A	Creeps up with oxide film and re-torque history
Tamper evidence	Anti-tamper keying plus integrated sealable points	No keying; sealing needs extra hardware
Phase spacing	Fixed by the chamber walls	Depends on how the installer lays the conductors

Professional Production Process

Every unit follows the same five steps, and the electrical results are recorded per batch.

Contact machining - copper alloy bar is cut and formed to the customer drawing.

Tin plating - precision plating is applied to the contact body before assembly.

Housing moulding - PC bodies are moulded to the UL94 V-0 rating and the 120 °C heat class.

Assembly - chambers, keying and screw-clamp terminals are seated in register across all three phases.

Testing - contact resistance at ≤0.5 mΩ, withstand voltage at AC 2500 V for 1 min, insulation resistance at ≥100 MΩ.

Material & Surface Treatment Options

Two material decisions are worth settling before the order goes in.

Contact Body And Tin Plating

The body is high-conductivity copper alloy with precision tin plating, which is what holds initial contact resistance at ≤0.5 mΩ and resists corrosion at the joint. Plating and any further surface treatment are fixed at order stage, so confirm the option you need against the drawing.

Flame-Retardant PC Housing

The housing is flame-retardant polycarbonate rated UL94 V-0 and keeps its structural integrity up to 120 °C. That rating covers meter cabinets and panel interiors that run warm in service.

Application Scenarios

Four places where a 100 A shielded metering connector earns its footprint.

Heavy Industrial Three-Phase Meter Panels

Industrial meter panels metering a load that sits close to 100 A continuously, in a panel that also carries drives and other switching equipment which would otherwise feed noise into the measuring circuit.

High-Load Commercial And Industrial Sub-Metering

Buildings and plants sub-metering tenants, workshops or process lines, where the connector has to hold accuracy across a wide load range without being re-torqued every maintenance round.

Utility-Grade Anti-Tamper Metering Cabinets

Cabinets that must meet the utility's anti-tamper compliance requirement, where sealed chambers, keyed insertion and visible sealing points are part of the acceptance criteria.

Solar PV And EV Charging Metering Points

PV arrays and AC charging points where a three-phase feed is metered for billing, and where the connector shares an enclosure with power electronics.

Frequently Asked Questions

Q: What is this connector designed to protect against?

A: It guards the metering circuit against external interference and unauthorised access. Shielded chambers block probe insertion, the keying prevents reversed connection, and the sealable points take a utility seal.

Q: What are the ratings of the 100 A version?

A: 100 A continuous at 380 V / 400 V AC three phase, with contact resistance at ≤0.5 mΩ and temperature rise below 45 K per IEC 60947-7-1. Withstand voltage is AC 2500 V for 1 minute.

Q: What conductors does it accept?

A: Copper conductors up to 35 mm² on a screw-clamp termination. The clamp bears on a broad face of the conductor rather than a single screw point, which keeps the joint tight under vibration.

Q: Do you support custom specifications, and what is the MOQ?

A: Phase configuration, plating and marking can be produced to your drawing under OEM or ODM terms. MOQ depends on the configuration and any tooling involved; trial orders for a new project are negotiable.

Q: What about testing, packaging and delivery?

A: Every batch is tested for contact resistance, withstand voltage and insulation resistance. Units ship in standard export packaging from Ningbo or Shanghai. Send your drawing and quantity for a quote within 24 hours.