FCP18-02 Series

Phase Control Relay
Phase Loss, Sequence & Over/Under Voltage Protection

Advanced three-phase monitoring relay with adjustable overvoltage (2%–20%) and undervoltage (-20%–-2%) thresholds, configurable time delay (0.1–30s), and comprehensive LED status indication — ideal for protecting critical industrial equipment from power quality issues.

3×208–480V AC L-L Phase Loss Detection Phase Sequence Monitoring Over/Under Voltage 0.1–30s Time Delay DIN rail mount 18mm slim design 1×SPDT 16A @ 250V AC LED Status Indication IP40 Front

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FCP18-02 Phase Control Relay with Over/Under Voltage Protection

            🎯
            ±2–20%
            Adjustable Over/Under Voltage
            Independent settings for overvoltage (2%–20%) and undervoltage (-20%–-2%) with precise digital button configuration.
        

            ⚡
            <200ms
            Phase Loss Response
            Detects missing phases and de-energizes the output relay rapidly to prevent motor and equipment damage.
        

            ⏱️
            0.1–30s
            Adjustable Time Delay
            Configurable delay-on and delay-off to prevent nuisance tripping during momentary voltage fluctuations.
        

            💡
            Comprehensive LED Indication
            Five dedicated LEDs provide real-time status of power, phase condition, over/under voltage, and relay output.
        

            🛡️
            Enhanced Anti-EMI Design
            Reinforced circuit ensures stable voltage monitoring even in complex electromagnetic environments.
        

            🔧
            1×10⁷
            Mechanical Life
            Exceptional durability with 1×10⁷ mechanical operations for long-term reliability in demanding applications.
        

📋 Models & Ordering

Model	System Type	Supply Voltage	Terminals	Protection Functions	Datasheet
FCP18-02A	3-phase 3-wire (L-L)	173–275V AC	L1 – L2 – L3	Phase Loss + Sequence + Over/Under Voltage	📄 Download PDF
FCP18-02B	3-phase 4-wire (L-N)	100–160V AC	L1 – L2 – L3 – N	Phase Loss + Sequence + Over/Under Voltage	📄 Download PDF
FCP18-02C	3-phase 3-wire (L-L)	310–480V AC	L1 – L2 – L3	Phase Loss + Sequence + Over/Under Voltage	📄 Download PDF
FCP18-02D	3-phase 4-wire (L-N)	180–278V AC	L1 – L2 – L3 – N	Phase Loss + Sequence + Over/Under Voltage	📄 Download PDF

💡 Model selection guide: Choose A/C for 3-phase 3-wire (L-L) systems, or B/D for 3-phase 4-wire (L-N) systems. A/B covers lower voltage ranges; C/D covers higher voltage ranges. All models provide Phase Loss, Phase Sequence, and adjustable Over/Under Voltage protection with 0.1–30s time delay.

⚙️ Technical Specifications

🔌 Input — Measuring (All Models)

Supply Terminal (A/C)	L1 – L2 – L3
Supply Terminal (B/D)	L1 – L2 – L3 – N
Monitoring Terminal	Same as supply terminal
Supply Voltage (A)	173–275V AC L-L
Supply Voltage (B)	100–160V AC L-N
Supply Voltage (C)	310–480V AC L-L
Supply Voltage (D)	180–278V AC L-N
Supply Frequency	45–60Hz

🛡️ Monitoring Function

Phase Failure	✔ (Response < 200ms)
Phase Sequence	✔ (Response < 500ms)
Overvoltage	2%–20% adjustable
Undervoltage	-20%–-2% adjustable
Asymmetry	—
Time Delay	0.1–30s

🔌 Output

Contact	1 × SPDT
Rated Current	16A @ 250V AC
Mechanical Life	1×10⁷ operations
Electrical Life	1×10⁵ operations

📐 Physical & Environmental

Dimensions	18 × 90 × 64 mm
Mounting	DIN rail EN 60715
Protection Degree	IP40 (front) / IP10 (terminals)
Operating Temp.	-20°C ~ +55°C
Storage Temp.	-30°C ~ +70°C

📜 Standards & Certifications

Compliance	GB/T 14048.5, IEC 60947-5-1, EN 6812-1
Contact Configuration	SPDT: 11(COM)-12(NC)-14(NO)
Pollution Degree	2
Max. Cable Size	AWG 13–20 / 0.4 N·m
Setting Deviation	0% – Digital Setting

💡 Panel LED Indicators

LED	Color	Status	Meaning
Un	Green	OFF	Supply voltage not applied
Un	Green	ON	Supply voltage applied
P	Red	ON	Phase normal (correct sequence, all phases present)
P	Red	Flashing	Phase sequence error (incorrect rotation)
P	Red	OFF	Phase loss detected
R	Red	OFF	NC (11-12) contact closed
R	Red	ON	NO (11-14) contact closed

📈 Function Diagram – Phase Loss & Sequence Protection

FCP18-02 Phase Loss and Phase Sequence Protection Function Diagram

• The relay continuously monitors the three-phase supply connected to L1-L2-L3 (and N for 4-wire models).
• When all three phases are present and in correct sequence, the output relay R closes (NO contact 11-14 makes, NC 11-12 breaks) after the set time delay. The P LED stays ON.
• If a phase loss is detected, the output relay R opens immediately (within 200ms). The P LED turns OFF.
• If a phase sequence error is detected, the output relay R opens immediately. The P LED flashes.
• When the fault clears, the relay automatically re-closes after the set time delay.

📈 Function Diagram – Overvoltage & Undervoltage Protection

FCP18-02 Overvoltage and Undervoltage Protection Function Diagram

• The relay continuously monitors the voltage level against the set overvoltage threshold (adjustable 2%–20% above nominal) and undervoltage threshold (adjustable -20%–-2% below nominal).
• If voltage goes above the overvoltage threshold, the output relay R opens after the set time delay T (configurable 0.1–30s). When the voltage drops back below the overvoltage threshold, R automatically re-closes (no delay).
• If voltage drops below the undervoltage threshold, the output relay R opens after the set time delay T. When the voltage rises back above the undervoltage threshold, R automatically re-closes.
• The configurable time delay helps prevent nuisance tripping caused by momentary voltage transients or short-term fluctuations.

🎬 See it in Action

🔧 Wiring & Terminal Layout

Terminal Identification

L1 — Phase L1 L2 — Phase L2 L3 — Phase L3 N — Neutral (B/D only) 11 — COM 12 — NC 14 — NO

⚠️ Safety Note: Keep the power supply disconnected during the entire installation process. Carefully check the wiring diagram and follow it correctly. Adhere to the specified voltage and current limits for each connection terminal.

3-phase 3-wire models (A/C): Connect L1, L2, L3 directly. No neutral connection required.
3-phase 4-wire models (B/D): Connect L1, L2, L3, and N. The wiring diagram shown is for 4-wire models. For 3-wire models, simply omit the N terminal.

FCP18-02 Wiring and Terminal Layout Diagram (4-wire L-N configuration)

Shown: 4-wire (L-N) wiring for B/D models. For A/C models, omit the N terminal.

🛠️ Parameter Setting Guide

Enter Parameter Setting Mode: Press and hold the button until the LED starts flashing. This indicates you have entered the configuration mode.
Set Rated Voltage (Un): Use the button to set the correct input voltage for your three-phase system. Refer to the setting details table for available options.
Set Overvoltage (U>) & Undervoltage (U<) Rate: Configure the overvoltage threshold (2%–20%) and undervoltage threshold (-20%–-2%).
💡 Note: When setting over & under voltage range, if the green LED is ON, add +1% to the scale reading for accurate threshold setting.
Set Time Delay (Tt): Choose the desired time delay from 0.1 to 30 seconds. This delay applies both to initial start-up and to the delayed opening of the output relay when an overvoltage or undervoltage condition is detected.
Confirm and Store: After all parameters are adjusted, press and hold the button until the LED stops flashing. The settings are stored and take effect immediately.

🏭 Typical Applications

⚡ Power Distribution
Front-line three-phase monitoring with voltage level protection

🌀 Compressors
Prevents motor damage from both phase faults and voltage deviations

💧 Pump Systems
Protects water and wastewater pumps from phase loss and voltage anomalies

🌬️ HVAC & Refrigeration
Safeguards compressors and fan motors from voltage-related damage

🏗️ Production Equipment
Ensures machinery operates within safe voltage and phase parameters

🔧 Machine Tools
Protects lathes, mills, and CNC machines from power quality issues

🔗 Related Products

Explore other phase relays in the FCP18 series, or time relays in the FCT18 series:

❓ Frequently Asked Questions

🔹 What protections does the FCP18-02 provide compared to the FCP18-01?

The FCP18-02 builds on the FCP18-01's Phase Loss and Phase Sequence protections by adding adjustable Overvoltage (2%–20%) and Undervoltage (-20%–-2%) thresholds, plus a configurable time delay (0.1–30s). This makes it ideal for applications requiring comprehensive voltage monitoring.

🔹 How do I set the input voltage and over/under voltage thresholds?

Enter parameter setting mode by long-pressing the button until the LED flashes. Set the rated voltage (Un) first, then the overvoltage rate (U>) and undervoltage rate (U<) using the button. Note: when the green LED is ON during rate setting, add 1% to the scale reading for precision. Confirm by long-pressing until the LED stops flashing.

🔹 What is the purpose of the adjustable time delay?

The 0.1–30 second time delay prevents nuisance tripping from momentary voltage fluctuations. For overvoltage and undervoltage faults, the output opens only after this delay has elapsed. The same delay applies to initial start-up. Recovery after the fault clears is immediate (no delay).

🔹 How can I read fault conditions from the front panel?

The FCP18-02 features five LED indicators: Un (green, power), P (red, phase status: ON = normal, Flashing = sequence error, OFF = phase loss), and R (red, output relay). Additionally, the U> (overvoltage) and U< (undervoltage) LEDs illuminate when those respective faults are active.

🔹 What is the mechanical life of the output contacts?

The relay has an outstanding mechanical life of 1×10⁷ operations. Electrical life is 1×10⁵ operations at rated 16A/250V AC load.

🔹 Can I use this relay for generator or backup power applications?

Yes. The FCP18-02 is excellent for generator and backup power monitoring. The adjustable over/under voltage protection ensures connected equipment only operates when supply voltage is within safe limits, and the time delay prevents frequent cycling during unstable power conditions.

📞 Need a Quote or Technical Support?

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💬 WhatsApp: +852 84802863 ✉️ Email: info@fiicco.com