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XJ3-D is a multi-functional three-phase power protection device widely used in AC 380V power systems. It provides four-fold protection for three-phase asynchronous motors and circuits against phase failure, phase reversal, overvoltage, and undervoltage, preventing equipment damage and safety accidents caused by abnormal power supply.
- Core Functions & Features
| Protection Function | Technical Description | Operating Mechanism |
| Phase Failure Protection | Detects loss of any phase in three-phase power | Upon detection, the relay’s normally closed contact opens, cutting power to the contactor coil |
| Phase Sequence Protection | Identifies phase sequence (normal/reverse) of three-phase power | Once phase sequence is registered, load startup is inhibited if sequence changes; phase failure/reversal LED illuminates |
| Overvoltage Protection | Protection voltage adjustable from 380V to 460V | Operating time adjustable 1.5s–4s; control circuit opens on overvoltage |
| Undervoltage Protection | Protection voltage adjustable from 300V to 380V | Operating time adjustable 2s–9s; control circuit opens on undervoltage |
Product Features:
Multi-mode fault indication (three LEDs for phase reversal/failure, overvoltage, undervoltage)
Reliable performance, wide application range, easy to use
Compact size, convenient DIN-rail mounting
| Complies with GB/T 14048.5
- Technical Parameters
| Item | Specification | Remarks |
| Rated control supply voltage | AC 380V, 50/60Hz | Direct three-phase power supply |
| Overvoltage protection range | 380V–460V (adjustable) | Factory default approx. 420V |
| Undervoltage protection range | 300V–380V (adjustable) | Factory default approx. 340V |
| Overvoltage operating time | 1.5s–4s (adjustable) | Time delay to avoid misoperation |
| Undervoltage operating time | 2s–9s (adjustable) | Time delay to avoid misoperation |
| Phase failure operating time | ≤2s | Fast response |
| Phase sequence operating time | ≤1s | Fast response |
| Contact rating | AC-15: 220V/5A, 380V/3A | Control circuit load capacity |
| Dimensions | Approx. 45×75×105mm | Standard DIN-rail size |
| Mounting | DIN-rail mounting | Complies with EN 50022 |
- Operating Principle
The XJ3-D achieves comprehensive protection via internal voltage detection, phase detection, and time-delay circuits:
- Voltage detection: Monitors three-phase voltage amplitude in real time and compares with set over/undervoltage thresholds
- Phase detection: Analyzes phase relationship to judge correct sequence and phase loss
- Logic judgment: Triggers time delay (over/undervoltage) or direct protection (phase failure/reversal) when abnormality is detected
- Protection action: Internal relay operates; normally closed contact opens, cutting power to downstream contactor coil and de-energizing the main circuit
LED Status Indication:
Normal operation: All three LEDs off (faint glow of phase reversal/failure LED under slight unbalance is normal)
Phase failure / reversal: Phase reversal/failure LED on
Overvoltage: Overvoltage LED on
Undervoltage: Undervoltage LED on
- Wiring & Installation
4.1 Standard Terminal Definition
| Terminal No. | Function | Wiring Description |
| 1, 2, 3 | Three-phase power input | Connect to L1, L2, L3 (380V); any sequence allowed, auto-learn on first power-on |
| 5, 6 | Normally open (NO) contact | Open under normal protection, closed on fault |
| 7, 8 | Normally closed (NC) contact | Closed under normal protection, open on fault (commonly used for contactor coil control) |
| 9 | Common terminal | Used with terminals 5 and 7 |
4.3 Installation Notes
Must be installed by qualified personnel in strict accordance with wiring diagrams
| Install in dry, ventilated areas free of corrosive gas; ambient temperature -5℃ ~ +40℃
If load fails to start after correct wiring, swap any two phases to re-learn phase sequence
Regularly check terminal tightness to prevent poor contact
- Brands & Selection
Main Brands: Delixi, CHINT, People Electric, Taihua Electric, etc.
Selection Guidelines:
- Confirm control voltage is three-phase AC 380V
- Select appropriate contact rating based on load type
- Choose XJ3-D (multi-function) if over/undervoltage protection is required
- Choose simplified models such as XJ3-G1 if only phase failure and phase sequence protection are needed
- Troubleshooting
| Fault Symptom | Possible Causes | Troubleshooting |
| Phase reversal/failure LED always on | 1. Incorrect phase sequence | 1. Swap any two power lines |
| 2. One phase missing | 2. Check three-phase supply | |
| 3. Loose wiring | 3. Tighten terminals | |
| Overvoltage LED always on | 1. Excessively high supply voltage | 1. Measure line voltage |
| 2. Overvoltage threshold set too low | 2. Adjust overvoltage potentiometer | |
| Undervoltage LED always on | 1. Low supply voltage | 1. Measure line voltage |
| 2. Undervoltage threshold set too high | 2. Adjust undervoltage potentiometer | |
| Cannot reset after protection | 1. Power abnormality not resolved | 1. Restore power then repower |
| 2. Internal protector fault | 2. Replace the unit |
As a mature multi-function three-phase power protection device, the XJ3-D effectively prevents motor burnout caused by phase failure, reversal, overvoltage, and undervoltage. It is widely used in control circuits for pumps, fans, compressors, machine tools, and other three-phase equipment, making it an indispensable component in industrial automation systems.
Model Comparison & Price Guide for Phase Sequence Protectors (Various Brands)
Below is a comparison of mainstream domestic and imported phase sequence protectors, focusing on models equivalent to the XJ3-D (four-fold protection: phase failure, sequence, overvoltage, undervoltage), with market price ranges and key differences for easy selection and procurement.
- Domestic Brands -Model Comparison & Prices (April 2026)
1.1 Core Function Comparison
| Brand | Multi‑function Type (Phase failure + Sequence + Overvoltage + Undervoltage) | Basic Type (Phase failure + Sequence) | Notes |
| CHINT | XJ3-D AC380V | XJ3-G AC380V | XJ3-5 with base |
| Delixi | XJ3-D AC380V (XJ3D380) | XJ3-G AC380V (XJ3G380) | Fully compatible with CHINT, same mounting size |
| PEOPLE | XJ3-D AC380V | XJ3-G AC380V | Slightly lower price |
| Taihua | XJ3-D AC380V | XJ3-G AC380V | Cost-effective for bulk purchase |
| Naidian | NDX-D AC380V | NDX-G AC380V | Fully XJ3-series compatible |
1.2 Price List (CNY)
| Brand | Model | Official Store Price | Wholesale Price | Retail Price (Taobao) | Features |
| CHINT | XJ3-D | 72.27–108.82 | 30–40 | 38–50 | Stable, high market share |
| CHINT | XJ3-G | 40–50 | 25–35 | 28–38 | Basic protection, economical |
| Delixi | XJ3-D | 79.8 | 32–42 | 40–55 | Adjustable over/undervoltage |
| Delixi | XJ3-G | 40.4 | 22–30 | 25–35 | High cost-performance |
| PEOPLE | XJ3-D | 65–80 | 28–38 | 35–45 | Moderate price, reliable |
| PEOPLE | XJ3-G | 35–45 | 22–30 | 25–32 | Basic function, affordable |
- Imported Brands -Model Comparison & Prices
2.1 Equivalent Models to XJ3-D
| Brand | Multi‑function Type | Basic Type | Price Range (CNY) |
| Schneider | RM22TG20 (with over/undervoltage) | RM22TG20 (basic) | 216–350 |
| ABB | CM-PVS.41S (voltage monitoring) | CM-PFE / CM-PFS.S | 335–799 |
| Carlo Gavazzi | DPA51CM44 (multi-function) | DPA51CM44 (basic) | 180–300 |
| Siemens | 3UG4512-1AW30 | 3UG4511-1AW30 | 280–450 |
2.2 Key Features of Imported Models
Schneider RM22TG20: 208-480VAC, global voltage, 2CO contacts, response ≤1s
ABB CM-PVS.41S: Phase imbalance protection, adjustable delay, for precision equipment
Carlo Gavazzi DPA51CM44: DIN rail, LED indication, adjustable thresholds, best value among imports
Siemens 3UG4512: High integration, PLC communication, for high-level automation
- Selection Reference & Notes
3.1 Application Guide
| Application | Recommended Type | Reason |
| General three-phase motors (pumps, fans) | XJ3-G / XJ3-D | Sufficient basic protection, economical |
| Precision equipment (CNC, compressors) | XJ3-D / imported multi‑function | Over/undervoltage protection prevents damage |
| Non‑reversible equipment (elevators, cranes) | Must include phase sequence protection | Prevents reverse rotation hazards |
| Unstable grid areas | XJ3-D / imported multi‑function | Protects against voltage fluctuations |
3.2 Price Factors
- Function: Multi-function models (XJ3-D) cost ~30-50% more than basic types (XJ3-G)
- Brand: Imported units are 3-5× more expensive than domestic
- Channel: Official > retail > wholesale
- Quantity: 10%-20% discount for bulk orders (≥10 pcs)
3.3 Compatibility Notes
All XJ3 series use DIN-rail mounting (EN 50022), identical dimensions
Same terminal layout: 1/2/3 = three-phase input; 7/8 = NC contact
Direct interchangeable among domestic XJ3 models; verify size/wiring for imports
- Summary & Procurement Suggestions
| Budget | Recommended Model | Application |
| Low (≤50 CNY) | CHINT / Delixi / PEOPLE XJ3-G | General motor protection |
| Medium (50–100 CNY) | CHINT / Delixi XJ3-D | Most industrial applications |
| High (≥200 CNY) | Schneider RM22TG20 / ABB CM-PVS.41S | Precision equipment & critical lines |
Phase Sequence Protector Model List
Below is a list of mainstream models functionally equivalent to the XJ3-D (phase failure + sequence + overvoltage + undervoltage), categorized by brand with key parameters and April 2026 price ranges for quick selection.
- Domestic Mainstream Models (AC 380V)
1.1 Multi-function Type
| Brand | Model | Key Parameters | Price (CNY) | Notes |
| CHINT | XJ3-D AC380V | Overvoltage 380–460V, undervoltage 300–380V, contact 5A/220V | 38–108 | Official: 72.27–108.82 |
| CHINT | XJ3-D-40 AC380V | With base, same as XJ3-D | 45–120 | Easy replacement |
| Delixi | XJ3-D AC380V | Overvoltage delay 1.5–4s, undervoltage 2–9s, LED | 40–79.8 | Official: 79.80 |
| PEOPLE | XJ3-D AC380V | Phase failure ≤2s, sequence ≤1s, DIN rail | 35–80 | Lower price |
| Taihua | XJ3-D AC380V | XJ3 compatible, adjustable thresholds | 32–65 | Bulk-friendly |
| Naidian | NDX-D AC380V | Same function as XJ3-D | 30–60 | Domestic alternative |
| CHINT | NJB1-X | Sequence + failure + imbalance, 380–480V | 45–90 | For unstable voltage |
1.2 Basic Type
| Brand | Model | Key Parameters | Price (CNY) | Notes |
| CHINT | XJ3-G AC380V | Phase failure/sequence, 3A/380V | 28–50 | Official: 40–50 |
| Delixi | XJ3-G AC380V | Failure ≤2s, sequence ≤1s | 25–40.4 | Official: 40.40 |
| PEOPLE | XJ3-G AC380V | DIN rail, LED | 25–45 | Economical |
| Delixi | XJ3-2 AC380V | Simplified sequence + failure | 22–35 | Basic circuits |
| Delixi | XJ3-5 AC380V | Failure + sequence + imbalance (7–10%) | 30–50 | With imbalance protection |
- Imported Models (Equivalent to XJ3-D)
2.1 Multi-function Type
| Brand | Model | Key Parameters | Price (CNY) | Features |
| Schneider | RM22TG20 | 208–480VAC, 2CO, ≤1s | 216–350 | 22.5mm width |
| Schneider | RM4TG20 | Same as RM22TG20 | 180–280 | Localized version |
| ABB | CM-PVS.41S | 208–440V, imbalance, adjustable delay | 335–799 | High precision |
| Carlo Gavazzi | DPA51CM44 | 380V, adjustable, LED | 180–300 | Fast response |
| Siemens | 3UG4512-1AW30 | 380V, over/undervoltage + failure + sequence, PLC | 280–450 | High integration |
| Schneider | RM22TR33 | Three-phase monitoring + over/undervoltage + imbalance | 240–380 | Full protection |
2.2 Basic Type
| Brand | Model | Key Parameters | Price (CNY) | Features |
| Schneider | RM22TR20 | 208–440V, failure + sequence | 180–280 | Modular |
| ABB | CM-PFE.S | 208–440V, 1CO, ≤1s | 280–550 | Compact |
| ABB | CM-PFS.S | 208–440V, 2CO, fault memory | 320–600 | Critical loads |
| Siemens | 3UG4511-1AW30 | 380V, failure + sequence, LED | 220–350 | Industrial grade |
| Carlo Gavazzi | DPA51CM44 (basic) | 380V, failure + sequence | 150–250 | Simplified |
- Special Application Models
| Brand | Model | Features | Application | Price (CNY) |
| CHINT | XJ12 | Elevator‑specific, failure + sequence + imbalance | Elevator control | 50–100 |
| Delixi | ZYD1 | Pump‑specific, failure + sequence + overcurrent | Pump circuits | 45–90 |
| Schneider | RM22TU23 | Three-phase monitoring + undervoltage | Unstable grids | 200–320 |
| ABB | CM-MPS.41S | Motor protection + phase sequence | Integrated motor protection | 400–800 |
- Quick Selection Reference
4.1 Naming Rules (Domestic XJ3 Series)
XJ3: Basic phase failure & sequence relay
D: Multi-function (failure + sequence + overvoltage + undervoltage)
G: Basic type (failure + sequence)
2/5: Special functions (2 = basic; 5 = with imbalance)
AC380V: Rated voltage
4.2 Mounting & Compatibility
All XJ3: DIN-rail mount (EN 50022), dimensions ~45×75×105mm
Identical terminal definition: 1/2/3 = power; 7/8 = NC
Domestic XJ3 models directly interchangeable
4.3 Price Factors
| Factor | Price Difference |
| Function | Multi‑function +30–50% |
| Brand | Imported = 3–5× domestic |
| Channel | Official > retail > wholesale |
- Procurement Advice
- General industry: Domestic XJ3-D (CHINT/Delixi), 50-80 CNY
- Precision/critical lines: Imported (Schneider RM22TG20 / ABB), 200-400 CNY
- Basic protection: XJ3-G, 25-40 CNY
