Multiple communication interfaces supported?

Dual RS-485, or RS485 + Ethernet.

Certifications available?

CE, ISO9000, factory test reports.

2 years original factory warranty 24-hour free technical support via Email and WhatsApp Free parameter configuration guidance and troubleshooting service OEM & ODM customized service are available

Romaz Rdr-4D Draw-out Overcurrent Earth Fault Relay

Name: Romaz Rdr-4D Draw-out Overcurrent Earth Fault Relay
Brand: Romaz Technology Co., Ltd
SKU: 2313786785

Guangdong, ChinaRomaz Technology Co., Ltd

US$370.00

1-9 Pieces

US$259.00

10-49 Pieces

US$222.00

50-99 Pieces

US$185.00

100-199 Pieces

US$148.00

200+ Pieces

Sample price:US$370.00/piece.Request sample

Product profile

Customization

Available

After-sales Service

2 Years

Warranty

2 Years

Model NO.

RDR-4D

Display

Digital

Installation

Direct Connected

Usage

Meter for Industry and Home Use, Protection Relays_Idmt Earth Fault Relay

Electric Equipment

Protection Relays_Three Phase Over Current

Theory

Protection Relays_Three Phase Over Current

Power Meter Connection

Protection Relays_Three Phase Over Current

Measured Signal

Continuous Wave

Type

Protection Relays_Three Phase Over Current

Certification

ISO, CE

Customized

F50/51

Three Phase Over Current Elements

F50n/51n

Earth Fault Elements

F50h

Harmonic Blocking

F50bf

Circuit Breaker Failure Protection

Compliance Standard

IEC 60255 Series International Relay Protection St

Core Protection Function

4-Channel CT Input Over Current + Earth Fault ...

Protection Curves

Support Full Series IEC Standard Inverse Curves...

Communication

Standard RS485 Modbus RTU, Optional Ethernet Commu

Auxiliary Power

85~265VAC / 110~330VDC Wide Range AC/DC Power Supp

Core Functions

CT Auto Shorting, 100 Fault Records, Fault ...

Application Scenarios

Medium & High Voltage Distribution System...

Transport Package

Carton Box

Trademark

Romaz

Origin

China

HS Code

9030390000

Production Capacity

50000PCS/Month

Key features

Microcontroller Numeric Design: Features programmable DI/DO, true RMS measurement, and event recorder with 100 records.

Comprehensive Protection Functions: Includes 3-phase over current, earth fault, harmonic blocking, and circuit breaker failure protection.

Flexible Power Supply Options: Supports Type 1 (18-60VDC) and Type 2 (85-265VAC / 88-300VDC) power ratings.

Advanced Communication Interfaces: Equipped with RS-485 and USB communication for device management via RDRCom1.

Self CT Shorting Feature: Includes CT terminal with self shorting capability for safe maintenance and operation.

Programmable Output Relays: Features 3 programmable output relays plus dedicated relays for trip supervision and self-check.

Company profile

Importers and ExportersHigh Repeat Buyers ChoiceFast DeliveryManagement Certification

Romaz Technology Co., Ltd

Guangdong, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 5 Years CertifiedNearest Port: Shenzhen Port, Guangzhou Port, Foshan PortAverage Response Time: ≤0.69h

AI-Powered supplier vetting

SummaryRomaz demonstrates established R&D and customization capabilities, including ODM services, new-product activity during the past year, and customization from samples, designs, or full requirements. It reports OEM service for well-known brands, quality procedures, traceability for raw materials, CE certification, and an ISO9001:2015 certificate. Export activity represents 31%–40% of total sales, with five years of exporting experience and both agency and self-operated export channels. However, the supplier has no available SDK, overseas warehouse, overseas showroom, overseas agent or branch, and has not participated in offline trade shows. Production scale and customer-specific case evidence are limited in the provided information. Financial records are referenced for multiple years, but the slices do not provide enough non-financial evidence to assess financial credibility.

Supplier typeThe supplier provides ODM and OEM services, maintains product development and sales/service teams, and exports through both agents and its own import-export rights. These characteristics support classification as a manufacturer-oriented supplier with OEM/ODM and export-service capability.

CertificationsThe supplier reports an ISO9001:2015 management-system certificate and CE certification for products or compliance with standards. The slices explicitly document both certifications, although no validity period or certificate scope is provided.

After-Sales capabilityThe supplier has a documented and followed procedure for handling customer complaints, corrective and preventive actions, and service-capability assessment. Its stated service team and quality-assurance procedures further support service capability, but overseas service infrastructure is absent.

R&D capabilityThe supplier reports new-product activity during the past year, ODM services, a product laboratory and development team, and the ability to develop special-project solutions. Its R&D team is described as responding flexibly to market demand, although no SDK is available.

Production capacityEvidence includes a production line, inspection equipment, written and uniformly followed finished-product inspection instructions, one quality-assurance/quality-control inspector, and raw-material traceability. These demonstrate basic controlled production and quality processes, but production capacity or output scale is not provided.

Customization capabilityThe supplier explicitly supports customization from samples, designs, full customization, minor customization, and flexible customization. Its R&D team also provides customized modifications and special-project solutions, indicating broad customization coverage.