$ 134.09
Ensure reliable power with Phoenix Contact EMD-SL-PH-400. Detects phase loss, asymmetry, and sequence errors to protect equipment and boost uptime.
The Phoenix Contact EMD-SL-PH-400 monitoring relay is engineered to safeguard three-phase electrical systems by supervising phase sequence, detecting failures, and identifying asymmetry. Operating within a wide range of 342…457 V AC, it helps prevent costly downtime and equipment malfunctions caused by unstable or incorrect power conditions. With its compact housing for DIN rail mounting, two changeover contacts, and easy-to-read LED indicators, it integrates smoothly into control panels. This relay is a dependable solution for industries requiring consistent network reliability, from process automation to heavy-duty power distribution.
The Phoenix Contact EMD-SL-PH-400 offers robust functionality that goes beyond basic protection. Its rapid fault detection with recovery times under 100 ms ensures minimal disruption while maintaining strong safeguards. Fixed start and response delays allow short-term fluctuations without unnecessary system shutdowns, supporting stable operations. Built with long service life and certified to international standards, it provides reliability across global applications. By reducing the risk of equipment damage, lowering maintenance costs, and improving process uptime, this relay delivers real-world advantages to engineers, technicians, and operators working in demanding electrical environments.
The Phoenix Contact EMD-SL-PH-400 is designed for professionals who demand uncompromising reliability in three-phase systems. Compact, easy to mount, and equipped with precise fault detection, it ensures equipment operates under stable conditions. By combining robust safety functions with long service life, it becomes an essential choice for industries where uninterrupted operation and process security are critical.
Power systems often fail due to incorrect phase sequence, unnoticed voltage imbalance, or sudden phase loss—issues that can lead to equipment damage and costly downtime. The EMD-SL-PH-400 solves these problems by continuously supervising voltage conditions, instantly identifying irregularities, and providing immediate response signals. This proactive protection prevents failures, reduces maintenance, and secures operational continuity in demanding environments.
| Feature | Details | Benefit |
|---|---|---|
| Product Type | Phase monitoring relay | Protects three-phase systems against faults |
| Voltage Range | 342…457 V AC | Wide monitoring range for flexible use |
| Monitored Functions | Phase sequence, phase failure, asymmetry (30% fixed) | Prevents damage caused by unstable power supply |
| Response Time | Recovery < 100 ms | Rapid fault detection minimizes downtime |
| Contacts | 2 changeover (floating) | Versatile switching for integration into control systems |
| Service Life | Electrical: 2 × 10⁵ cycles | Long-term reliability in demanding environments |
| Mounting | DIN rail NS 35, any position | Simple and universal installation |
| Protection Class | Housing IP40, Terminals IP20 | Safe and reliable operation in control cabinets |
| Operating Temperature | -25 °C … +55 °C | Wide range suitable for harsh conditions |
| Standards & Approvals | CE, UL, cUL, EAC | Meets global safety and EMC standards |
| Housing Material | Polyamide PA, self-extinguishing | Flame-retardant and durable construction |
Download Phoenix Contact EMD-SL-PH-400 2866077 Datasheet
| Commercial Data | Value |
|---|---|
| GTIN Number | 4017918952679 |
| Tariff / Traffic Number | 85364900 |
| Weight | 149 g |
| Country of Origin | Austria (AT) |
Water treatment plants rely on heavy three-phase pumps that must run continuously. If a single phase drops out or the sequence is reversed, pumps can quickly overheat or seize. By integrating a monitoring relay like the EMD-SL-PH-400, the system constantly supervises voltage balance and sequence. When irregularities occur, the relay disconnects power in less than a second, preventing winding damage or unexpected failures. This proactive safeguard reduces emergency repairs, extends motor service life, and ensures uninterrupted pumping operations. The result is higher process reliability and lower maintenance budgets for critical municipal or industrial water supply networks.
Heating, ventilation, and air-conditioning systems in high-rise buildings often use several three-phase motors for chillers and large fans. Voltage instability or wiring errors can lead to sequence problems or phase loss, which in turn can damage compressors or bearings. A phase monitoring relay ensures correct sequence before startup and continually checks for asymmetry during operation. If an imbalance exceeds the safe threshold, the system immediately signals a fault or disconnects. This protection minimizes vibration issues, avoids unexpected shutdowns, and helps keep climate control systems running smoothly, providing comfort and efficiency across office spaces, hotels, and shopping complexes.
Modern manufacturing lines use a variety of motors and robotic equipment that operate under fluctuating loads. Such uneven loads can cause voltage imbalance, drawing higher current on some phases and reducing machine lifespan. The EMD-SL-PH-400 monitoring relay constantly evaluates phase voltage conditions, triggering alarms or disconnections when the fixed asymmetry threshold is reached. This intervention prevents equipment overheating, reduces risk of costly line stoppages, and ensures stable power for sensitive automation systems. Manufacturers benefit from higher product quality, reduced scrap rates, and minimized unplanned downtime, all of which support lean operations and consistent production schedules.
Hospitals, data centers, and telecom hubs rely on backup generators for power continuity. If a generator connects with incorrect phase order or loses one phase, sensitive equipment can fail within seconds. By placing a monitoring relay between the generator and the main distribution panel, operators gain continuous protection. The relay reacts within milliseconds to detect faults, ensuring safe disconnection or signaling to control systems. This safeguard allows smoother transition to emergency power, protects critical electronics, and avoids costly outages. Facilities benefit from dependable uptime, reduced hardware damage risk, and greater confidence in their emergency response strategies.
| Category | Model | Part Number | Benefit |
|---|---|---|---|
| DIN Rail Mounting | NS 35/7.5 | 0800886 | Provides a stable DIN rail base for installing the EMD-SL-PH-400 in control cabinets |
| End Brackets | CLIPFIX 35 | 3022276 | Locks devices in place on the DIN rail, ensuring vibration-resistant installation |
| Protective Fuse | TR5 Fuse 5 A | 2905078 | Matches recommended fuse rating for safe relay operation and fault protection |
| Terminal Blocks | UK 2.5 | 3044135 | Standard screw-type terminal blocks for secure three-phase wiring connections |
| Signal Relays | PLC-RSC-24DC/21-21AU | 2903342 | Expands output capability for alarms or integrating with external controllers |
| Power Supply Unit | QUINT POWER 24 V DC | 2904601 | Ensures stable DC supply for auxiliary components in the same control system |
| System Marking | ZB 10 | 0805216 | Clip-on marker strips for professional labeling of relay positions and terminals |
For expert guidance before placing your order.
Warranty – 1-year warranty for your peace of mind.
Global Shipping – We ship worldwide with secure packaging and reliable delivery.
Technical Support – Contact us for professional after-sales technical assistance.
