eaton
Eaton EMR4 Multifunction Monitoring Relay
Model: EMR4-A500-2-1
4-hour response · Pricing in SAR · Delivery across all KSA regions
EMR4-A500-2-1 — Eaton EMR4 Multifunction Monitoring Relay
The Eaton EMR4 Multifunction Monitoring Relay is a compact, versatile protection relay that simultaneously monitors voltage (over/under), phase sequence, phase loss, phase asymmetry, and frequency deviation in three-phase electrical systems — providing comprehensive supply quality protection in a single 22.5 mm DIN rail device. The EMR4-A500-2-1 operates on 200–500 V AC three-phase supply and incorporates two independently programmable output relays with adjustable time delays, enabling it to control contactors, signal alarms, or initiate switchover sequences. Its front-panel LED indicators provide instant visual diagnosis of the fault condition without requiring a multimeter or panel instruments, reducing troubleshooting time in Saudi Arabia's industrial plants and utility substations where maintenance access is often constrained.
The EMR4's comprehensive voltage and phase monitoring capability is essential in Saudi Arabia's industrial distribution networks, where utility supply quality can be affected by load shedding sequences, transformer tap changes, and large motor starting events on shared busbars. Phase loss and asymmetry protection is particularly critical for three-phase motor loads at SABIC and Saudi Aramco facilities, where undetected phase loss causes rapid motor winding burnout — an especially damaging failure mode for large pumps and compressors whose repair or replacement lead times from Europe or Asia can extend to 12-16 weeks, causing significant production losses. The EMR4 trips the contactor within the programmed time delay (typically 0.1–10 seconds) before thermal damage can occur.
Across the Kingdom, EMR4 relays are specified in motor control centre outgoing feeders for Saudi Aramco's water injection and crude transfer pumps, SWCC desalination high-pressure pump MCCs, NWC municipal water pumping stations, and industrial fan and compressor drives in SABIC's Jubail facilities. The relay is also widely used in automatic transfer switches where phase loss detection is required to initiate generator start and ATS changeover before the connected load is affected. Its 22.5 mm slim profile allows dense installation in retrofit MCCs where panel space is at a premium.
Razz Middle East stocks the EMR4 in volume across all common voltage variants for immediate delivery. We supply to MCC panel builders, SEC-registered electrical contractors, and end-user maintenance teams across Saudi Arabia. Technical data sheets and wiring diagrams are provided with each order, and our engineers support application sizing for specific supply voltage and relay output requirements.
Technical Specifications
Full specifications for the EMR4-A500-2-1
- Supply Voltage
- 200–500 V AC (3-phase)
- Monitoring Functions
- Over/under voltage, phase loss, phase sequence, phase asymmetry, frequency
- Output Relays
- 2 independently programmable
- Time Delay
- 0.1–10 s (adjustable)
- Housing Width
- 22.5 mm DIN rail
- Diagnosis
- Front LED indicators
- Response Time
- <20 ms (phase loss)
- Temperature Range
- -25 to +55°C
Key Features & Benefits
- Simultaneous monitoring of voltage, phase sequence, phase loss, phase asymmetry, and frequency in one 22.5 mm device eliminates multiple single-function relays and reduces panel space.
- Two independently programmable output relays with adjustable 0.1–10 s time delays allow trip, alarm, and switchover logic to be implemented without external timers.
- Front-panel LED fault indicators provide instant visual diagnosis of the specific fault condition, reducing troubleshooting time from minutes to seconds in industrial panel environments.
- Phase loss detection response time under 20 ms prevents thermal damage to three-phase motor windings before thermal protection relays can react, particularly for motors above 30 kW.
- 22.5 mm slim DIN rail profile enables dense installation in retrofit MCCs and existing panels where per-outgoing-feeder protection is being added without panel expansion.
- Operating temperature range of -25 to +55°C supports installation in outdoor panel enclosures across Saudi Arabia's desert climate without derating or active cooling.
Industrial Applications in Saudi Arabia
- Motor control centre outgoing feeders for Saudi Aramco crude transfer and water injection pump motors, providing phase loss and asymmetry protection to prevent winding burnout.
- SWCC and MARAFIQ desalination high-pressure pump MCCs where phase loss trip initiates standby pump auto-start sequence to maintain continuous production.
- NWC municipal water pumping stations where utility supply quality monitoring triggers generator ATS changeover before connected pumping loads are affected.
- SABIC Jubail industrial fan and compressor drives where asymmetry protection identifies deteriorating supply quality early, before it causes equipment damage.
- Automatic transfer switch control panels where phase loss detection initiates generator start and ATS bus transfer within the relay's programmed time delay.
- Commercial building main distribution boards in Riyadh towers and Jeddah waterfront developments where phase monitoring protects HVAC compressor and elevator motor loads.
Industrial Supplier in Saudi Arabia
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Frequently Asked Questions — EMR4-A500-2-1
Common questions from buyers in Saudi Arabia and the GCC