Introduction to the FCP18 Three-Phase Voltage Relay

The VIOX FCP18 is a sophisticated three-phase voltage relay designed to provide comprehensive monitoring and protection for electrical systems across industrial, commercial, and utility applications. This intelligent relay constantly monitors power quality parameters including phase sequence, phase loss, overvoltage, undervoltage, and asymmetry to protect valuable equipment from damaging power conditions.

With its robust design and versatile functionality, the FCP18 supports worldwide power specifications and offers clear visual indication through LED status lights that make system monitoring intuitive and straightforward. The device’s compact form factor and DIN rail mounting capability make it an ideal solution for installations where space is at a premium.

Key Features and Benefits

Comprehensive Protection: Monitors for phase sequence, phase loss, overvoltage, undervoltage, and asymmetry conditions
Worldwide Power Specifications: Compatible with various global power standards
Visual Status Monitoring: Equipped with LED indicators for relay status, phase status, and power conditions
Configurable Time Delay: Adjustable response times to prevent nuisance tripping
Compact Design: Space-saving dimensions of 90mm × 18mm × 64mm
Easy Installation: DIN rail mounting compliant with EN/IEC 60715
Durable Construction: Mechanical and electrical life of 10⁷ operations
Wide Operating Temperature Range: Functions reliably from -20°C to +60°C

How the FCP18 Three-Phase Voltage Relay Works

The FCP18 operates by continuously monitoring the three-phase power supply and responding to abnormal conditions according to pre-configured parameters. When the relay detects an issue such as incorrect phase sequence, phase loss, voltage outside acceptable thresholds, or unacceptable asymmetry between phases, it triggers a response based on its programming.

The visual monitoring system employs multiple LED indicators:

Power LED: Indicates that the device is receiving power
Phase LED: Shows the status of phase monitoring
Relay LED: Indicates the relay’s operational status

The time delay feature is particularly valuable as it prevents unnecessary activation during momentary power fluctuations, reducing wear on connected equipment and minimizing production interruptions.

VIOX FCP18 Three-Phase Voltage Relay front

Protection Functions Explained

Phase Loss & Phase Sequence Protection

VIOX FCP18 Three-Phase Voltage Relay Phase Loss & Phase Sequence Protection

Phase loss occurs when one or more phases in a three-phase system fail, potentially causing severe damage to motors and other equipment. The FCP18 quickly detects phase loss conditions and activates protection mechanisms to prevent equipment damage.

Phase sequence monitoring ensures that the three phases (L1, L2, L3) maintain the correct rotational order, which is critical for the proper operation of three-phase motors and other direction-sensitive equipment. Incorrect phase sequence can cause motors to run backward, potentially damaging both the motor and connected machinery.

Overvoltage & Undervoltage Protection

VIOX FCP18 Three-Phase Voltage Relay Overvoltage & Undervoltage Protection

The FCP18 constantly monitors voltage levels across all three phases. When voltage exceeds or falls below preset thresholds, the relay responds according to its configuration. The time delay increases proportionally as the voltage stabilizes, preventing unnecessary triggering during brief fluctuations.

Overvoltage protection prevents damage from power surges, while undervoltage protection guards against issues like motor overheating that can occur when operating at reduced voltage levels.

Asymmetry Protection

VIOX FCP18 Three-Phase Voltage Relay Asymmetry Protection

Voltage asymmetry (or imbalance) occurs when there’s an unequal distribution of voltage across the three phases. The FCP18 calculates asymmetry using the formula:

Asy = (Umax-Umin)/Uavr

Where:
Umax = max(U1,U2,U3)
Umin = min(U1,U2,U3)
Uavr = (U1+U2+U3)/3

Asymmetry can lead to inefficient operation, overheating, and premature failure of three-phase equipment, making this protection function essential for maintaining system health and longevity.

FCP18 Models and Configuration Options

The FCP18 is available in multiple configurations to accommodate various monitoring requirements and power systems. The model numbering system (FCP18-01-A) provides specific information about the device’s functionality and supply voltage range.

1. Function
Model	Over voltage	Under voltage	Asymmetry	Time delay	Phase sequence/loss
01	N/A	N/A	N/A	5s	✓/✓
02	+20%	-20% ~ -2%	N/A	0.1-30s	✓/✓
03	+20%	-20% ~ -2%	5%-15%	0.1-30s	✓/✓
04	+20%	-20% ~ -2%	5%-15%	5s	✓/✓
05	N/A	N/A	5%-15%	0.1-30s	✓/✓
06	15%	-15%	8%	5s	✓/✓

2. Supply voltage
Code	Range
A	3phase 3wire: 173,190,198,208,220,230,240,250,260,275 L-L
B	3phase 4wire: 100,110,115,120,127,133,139,145,153,160 L-N
C	3phase 3wire: 310,328,345,365,380,400,415,440,460,480 L-L
D	3phase 4wire: 180,190,200,210,220,232,240,255,266,278 L-N

Technical Specifications

Parameter	Specification
Monitoring terminal	3phase 3wire: L1-L2-L3 3phase 4wire: L1-L2-L3-N
Supply terminal	3phase 3wire: L1-L2 3phase 4wire: L1-N
Rated supply frequency	45HZ-60HZ
Voltage tolerance	-15% ~ +10%
Supply indication	Green LED
Relay indication	Red LED
Time ranges	0.1s-30s
Setting	Button
Setting deviation	0.1%
Measurement accuracy	≤1%
Temperature coefficient	0.05%/°C, at=20°C (0.05%/°F, =-68°F)
Output contact	1*SPDT
Rated current	1*16A
Mechanical life	1*10⁷
Electrical life	1*10⁵
Ambient Temperature	-20 … +60 °C / -40 … +85 °C
Mounting	DIN rail EN/IEC 60715
IP Rating	IP20
Stripping length	7mm (0.28in)
Installed altitude	≤2200m
Pollution level	2
Max cable size	AWG13-20 0.4N·m
Dimensions	90mm18mm64mm
Weight	About 90g
Standards	GB/T 14048.5, IEC60947-5-1, EN6812-1

Applications of the FCP18 Three-Phase Voltage Relay

The FCP18 three-phase voltage relay finds application in numerous settings where reliable power quality monitoring is essential:

Industrial Manufacturing: Protects expensive motor-driven equipment and production lines from power abnormalities
Commercial Buildings: Safeguards HVAC systems, elevators, and other critical building infrastructure
Water Treatment Facilities: Ensures uninterrupted operation of pumps and processing equipment
Agricultural Operations: Protects irrigation systems and processing equipment
Data Centers: Provides an additional layer of power quality monitoring for critical IT infrastructure
Renewable Energy Systems: Monitors power quality in wind and solar generation facilities
Oil and Gas: Protects critical pumping and processing equipment

Installation Guide

The FCP18 offers straightforward installation on standard DIN rails (EN/IEC 60715), with clear terminal markings for proper wiring. The relay supports both three-phase three-wire and three-phase four-wire configurations, with specific connection terminals for each arrangement:

VIOX FCP18 Three-Phase Voltage Relay wiring

Three-Phase Three-Wire Configuration:

Monitoring terminals: L1-L2-L3
Supply terminals: L1-L2

Three-Phase Four-Wire Configuration:

Monitoring terminals: L1-L2-L3-N
Supply terminals: L1-N

With its IP20 protection rating, the FCP18 should be installed in appropriate enclosures when used in environments with high levels of dust, moisture, or potential physical contact.

Why Choose the VIOX FCP18 Three-Phase Voltage Relay?

The FCP18 stands out from other three-phase voltage relays due to its combination of comprehensive protection functions, configuration options, and reliability. Its clear visual indicators make system status immediately apparent, while the adjustable time delay settings allow for customization to specific application requirements.

With support for worldwide power specifications and compliance with international standards (GB/T 14048.5, IEC60947-5-1, EN6812-1), the FCP18 provides a globally compatible solution for power monitoring and protection. The device’s compact dimensions and DIN rail mounting capability make it suitable for installations where space is limited.

VIOX’s commitment to quality is evident in the FCP18’s robust design, featuring a mechanical life of 10⁷ operations and electrical life of 10⁵ operations, ensuring years of reliable service in demanding applications.

Conclusion

The VIOX FCP18 three-phase voltage relay represents an essential component in modern electrical systems where power quality and equipment protection are priorities. By continuously monitoring for phase loss, incorrect phase sequence, voltage anomalies, and phase asymmetry, the FCP18 provides comprehensive protection against conditions that could damage valuable equipment or disrupt critical operations.

With its versatile configuration options, intuitive status indicators, and reliable performance, the FCP18 offers an effective solution for electrical system protection across industrial, commercial, and utility applications. Whether you’re safeguarding a manufacturing production line, a commercial building’s infrastructure, or critical utility equipment, the FCP18 delivers the monitoring capabilities needed to maintain system integrity and equipment longevity.

*The above information is subject to change without further notice

Three-Phase Monitoring Relay

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