FCP18-01
Phase Sequence & Phase Failure Monitoring Relay
Pure Phase Sequence & Phase Failure Protection — The Most Cost-Effective Entry Model
The FCP18-01 is the entry-level dedicated phase sequence and phase failure monitoring relay in the FCP18 family. Designed to detect reversed phase wiring and single/multi-phase loss in three-phase installations — the two most common and dangerous phase faults that can damage equipment and endanger personnel.
With no OV/UV or asymmetry functions to configure, the FCP18-01 offers the simplest installation and lowest cost in the FCP18 range. The relay connects directly to L1, L2, L3 (and N for 4-wire models), monitors continuously, and trips immediately when a phase fault is detected.
Quick Specifications
Why Choose the FCP18-01?
The simplest, most cost-effective dedicated phase sequence and phase loss relay in the FCP18 family.
Phase Seq. + Loss Detection
Dedicated phase sequence and phase failure monitoring in a single module — detects reversed wiring and any-phase loss immediately.
Immediate Trip
Phase sequence reversal and phase loss faults trip the relay immediately — no delay required for these instantaneous fault conditions.
16A SPDT Output Relay
High-capacity SPDT output handles direct motor and contactor switching. Mechanical life 10 million cycles, electrical life 100,000 cycles.
Zero Configuration
No voltage dial, no OV/UV setting, no asymmetry dial — simply connect L1, L2, L3 (and N) and the relay protects immediately.
Ultra-Compact 18mm Width
Takes minimal DIN rail space in the panel. Compact 90 × 18 × 64mm form factor fits any distribution board.
Protection Function
Dedicated phase sequence and phase failure monitoring — the simplest, most reliable phase protection available.
The FCP18-01 monitors the L1, L2, L3 phase rotational sequence continuously. If the phase sequence is reversed (L1 → L3 → L2) or any phase is interrupted (open circuit, blown fuse, cable break), the relay immediately trips to protect connected equipment. There are no OV/UV or asymmetry functions — this is pure, focused phase protection.
The relay is ideal for protecting three-phase motors, compressors, and any equipment where reversed phase wiring or phase loss can cause damage, malfunction, or safety hazards. Phase faults are among the most common electrical faults in industrial installations.
Phase Sequence & Phase Loss Protection
The FCP18-01 continuously monitors the rotational sequence of the three-phase supply (L1 → L2 → L3). If the phase sequence is reversed or any phase is interrupted (open circuit, blown fuse, or cable fault), the relay immediately detects the fault and trips. The red P LED on the front panel provides instant visual status: lit = correct sequence, flashing = fault detected.
- P LED lit (steady): All three phases present and in correct rotation sequence
- P LED flashing: Phase loss or phase sequence reversed
- Trip behavior: Immediate — no time delay for phase loss or sequence faults
- Protection scope: Single-phase loss, two-phase loss, and reversed phase wiring errors
Technical Specifications
Full electrical and mechanical specifications for the FCP18-01 series.
| Parameter | FCP18-01A / 01C | FCP18-01B / 01D |
|---|---|---|
| System Type | 3-Phase 3-Wire (L1-L2-L3) | 3-Phase 4-Wire (L1-L2-L3-N) |
| Voltage Range (L-L) | 173-275V AC (A) / 310-480V AC (C) | N/A for 4-wire models |
| Voltage Range (L-N) | N/A for 3-wire models | 100-160V AC (B) / 180-278V AC (D) |
| Rated Frequency | 45Hz - 65Hz | 45Hz - 65Hz |
| Voltage Tolerance | −15% to +10% | −15% to +10% |
| Over-voltage / Under-voltage | None | None |
| Voltage Asymmetry | None | None |
| Phase Sequence Function | Immediate trip on sequence fault | Immediate trip on sequence fault |
| Phase Loss Function | Immediate trip on any-phase loss | Immediate trip on any-phase loss |
| Output Contact | 1 × SPDT (NO+NC) | 1 × SPDT (NO+NC) |
| Rated Current | 16A / 250V AC | 16A / 250V AC |
| Mechanical Life | 1 × 107 operations | 1 × 107 operations |
| Electrical Life | 1 × 105 operations | 1 × 105 operations |
| Ambient Temperature | −20°C to +60°C | −20°C to +60°C |
| Mounting | DIN Rail EN/IEC 60715 (35mm) | DIN Rail EN/IEC 60715 (35mm) |
| Dimensions (H × W × D) | 90 × 18 × 64 mm | 90 × 18 × 64 mm |
| Weight | 68g | 68g |
| IP Rating | IP20 | IP20 |
| Standards | GB/T 14048.5, IEC60947-5-1, EN61812-1 | GB/T 14048.5, IEC60947-5-1, EN61812-1 |
Voltage codes: A = 173-275V L-L (3-wire) | B = 100-160V L-N (4-wire) | C = 310-480V L-L (3-wire) | D = 180-278V L-N (4-wire). Other voltages available on request.
Terminal Connections
SPDT relay output with screw-clamp terminals for fast, reliable wiring.
FCP18-01A / 01C — 3-Phase 3-Wire (L1-L2-L3)
FCP18-01B / 01D — 3-Phase 4-Wire (L1-L2-L3-N)
- Always de-energize the panel before wiring
- Verify supply voltage matches the module rating before powering on
- Connect L1, L2, L3 (and N for 4-wire models) to the corresponding system phases
- Terminal 11 = Common, 12 = NC, 14 = NO — wire your load to the appropriate contact
- Use correct wire gauge for 16A load current (min. 1.5mm²)
- Tighten terminal screws to 0.4 N·m torque specification
- Stripping length: 7mm (AWG13-20)
Front Panel & Settings
Zero configuration required — connect and protect. No voltage, OV/UV, or asymmetry dials.
| Parameter | Description | Setting Range |
|---|---|---|
Un |
Rated Input Voltage (system voltage) — the nominal voltage of the three-phase installation. Set this to match your system voltage. | See voltage code table in Models section |
LED Indicator Panel
Un — Green LED
Lit = relay is powered on and monitoring the system
P — Red LED
Lit = correct phase sequence. Flashing = phase reversal. Off = phase loss
R — Red LED
Lit = NO contact (terminals 11-14) is closed, relay is energized
⚙ How to Install and Operate
- Connect wiring: Connect L1, L2, L3 (and N for 4-wire models) to the corresponding terminals. Wire your load between terminals 11 and 14 (NO contact).
- Power on: Apply power to the relay. The green Un LED and red R LED will illuminate when the phase sequence is correct.
- Monitor: The P LED indicates phase status continuously. Flashing P LED = phase fault detected.
Note: The FCP18-01 has no adjustable dials. If phase sequence or phase loss protection is required and no indicator LEDs illuminate, check wiring connections first.
Models & Ordering
Choose the voltage configuration that matches your three-phase system.
| Model Code | System Type | Voltage Range (L-L) | Voltage Range (L-N) | Manual |
|---|---|---|---|---|
| FCP18-01A | 3-Phase 3-Wire | 173, 190, 198, 208, 220, 230, 240, 250, 260, 275 V | N/A | PDF ↓ |
| FCP18-01B | 3-Phase 4-Wire | N/A | 100, 110, 115, 120, 127, 133, 139, 145, 151, 160 V | PDF ↓ |
| FCP18-01C | 3-Phase 3-Wire | 310, 328, 345, 365, 380, 400, 415, 440, 460, 480 V | N/A | PDF ↓ |
| FCP18-01D | 3-Phase 4-Wire | N/A | 180, 190, 200, 210, 220, 232, 240, 255, 266, 278 V | PDF ↓ |
FCP18 Family — Model Comparison
Compare all six FCP18 series models to find the right protection configuration for your application.
| Model | Over-voltage | Under-voltage | Asymmetry | Time Delay | Phase Seq. | Phase Loss | Ideal For |
|---|---|---|---|---|---|---|---|
| FCP18-01 | — | — | — | 5s fixed | ✓ | ✓ | Phase sequence/loss only, budget applications |
| FCP18-02 | 2%-20% Adjustable | 2%-20% Adjustable | — | 0.1~30s | ✓ | ✓ | OV/UV + phase protection — cost-effective motor & pump protection |
| FCP18-03 | 2%-20% Adjustable | 2%-20% Adjustable | 8% fixed | 0.1~30s | ✓ | ✓ | Full protection incl. fixed asymmetry — general motor & compressor |
| FCP18-04 | 2%-20% Adjustable | 2%-20% Adjustable | 5%~15% adj. | 5s fixed | ✓ | ✓ | Adjustable asymmetry sensitivity — CNC, medical, precision equipment |
| FCP18-05 | — | — | 5%~15% adj. | 0.1~30s | ✓ | ✓ | Asymmetry-only with adjustable sensitivity |
| FCP18-06 | 15% fixed | 15% fixed | 8% fixed | 5s | ✓ | ✓ | Asymmetry + phase protection, no OV/UV adjustment |
Configuration Examples
The FCP18-01 requires no dial configuration — simply select your system voltage model.
FCP18-01A — 208V System
| Un (Voltage) | 208V (preset) |
| Protection | Phase seq. + loss |
| Tt (Delay) | 5s fixed |
FCP18-01A — 400V System
FCP18-01B — 120V System
| Un (Voltage) | 120V (preset) |
| Protection | Phase seq. + loss |
| Tt (Delay) | 5s fixed |
FCP18-01D — 230V System
See It In Action
Watch the FCP18 series product overview and demonstration.
Typical Applications
The FCP18-01 is ideal for any three-phase installation where phase protection is the primary requirement.
Motor Protection
Dedicated phase protection for three-phase motors where phase reversal and loss are the primary risks.
HVAC & Compressors
Protect compressors and HVAC equipment from phase faults with the most cost-effective dedicated phase relay.
Power Distribution
Panel-level phase monitoring in LV/MV switchgear and distribution boards.
Pump Panels
Cost-effective phase protection for water pump panels, irrigation systems, and booster stations.
Budget Applications
The most cost-effective dedicated phase sequence relay in the FCP18 family for budget-conscious projects.
Ready to Order or Need More Details?
Download the full technical manual or contact the FIICCO team for pricing, samples, and OEM options.
Frequently Asked Questions
Common questions about the FCP18-01 phase sequence and phase failure relay
The FCP18-01 is the simplest, entry-level model in the FCP18 family — it monitors only phase sequence and phase loss. It does not include over-voltage, under-voltage, or voltage asymmetry monitoring. All other FCP18 models add additional protection functions. Choose FCP18-01 when phase protection is all you need and budget is a priority.
Four voltage configurations are available: FCP18-01A (173-275V L-L, 3-wire), FCP18-01B (100-160V L-N, 4-wire), FCP18-01C (310-480V L-L, 3-wire), and FCP18-01D (180-278V L-N, 4-wire). Other voltages are available on request.
No. The FCP18-01 monitors only phase sequence and phase loss. For over-voltage and under-voltage protection, consider FCP18-02 (OV/UV + phase), FCP18-03 (OV/UV + asymmetry + phase), FCP18-04 (OV/UV + adjustable asymmetry + phase), or FCP18-06 (OV/UV + asymmetry + phase, all fixed thresholds).
No. The FCP18-01 is specifically designed for three-phase systems and requires three-phase input (L1, L2, L3) to operate. For single-phase voltage monitoring, consider a single-phase voltage monitoring relay from FIICCO's product range.
The FCP18-01 has a single SPDT (single-pole double-throw) relay contact rated 16A/250V AC. Terminal 11 is the common, 12 is normally closed (NC), and 14 is normally open (NO). Wire your load between terminal 11 and terminal 14 for normally open operation — the circuit is energized when the relay trips.
The FCP18-01 is certified to CE, RoHS, and meets the standards of IEC 60947-5-1, GB/T 14048.5, and EN 61812-1. This makes it suitable for industrial automation applications in Europe, Asia, and other global markets.
Yes. FIICCO provides OEM services including custom branding (logo, model number, color), tailored specifications, and custom packaging for orders of 100+ units. Factory-direct pricing ensures competitive costs for OEM customers. Contact us at info@fiicco.com with your requirements and quantity for a tailored quotation.