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Three-Phase Phase Sequence & Phase Loss Monitoring Relay
The DPA51CM44 is a three‑phase power monitoring relay from the DPA51 series manufactured by Carlo Gavazzi, specifically designed to detect phase sequence errors and phase loss faults in three‑phase power supplies, protecting motors and other three‑phase equipment from damage.
- Explicação do código do modelo
| Parte do modelo | Descrição |
| DPA | Série de produtos (three‑phase monitoring relay) |
| 51 | Product type (phase sequence & phase loss monitoring) |
| C | Function type (standard version, monitors phase sequence and phase loss) |
| M44 | Supply and output specification (208–480 VAC, SPDT output) |
- Principais especificações técnicas
| Parâmetro | Especificação |
| Função | Three‑phase phase sequence monitoring, phase loss monitoring |
| Tensão de alimentação | 208–480 VAC (±15%), self‑powered from the monitored supply |
| Measuring Range | 177–550 VAC (phase‑to‑phase) |
| Faixa de frequência | 50/60 Hz (±5%) |
| Output | 1 SPDT relay, 5 UM / 250 VAC, energized in normal condition |
| Regenerative Voltage Detection | Detects regenerative voltage up to 85% de tensão nominal |
| Montagem | Montagem em trilho DIN (compliant with DIN/EN 50022) |
| Dimensões | 17.5 × 81 × 67.2 milímetros (ultra‑slim design) |
| Classe de Proteção | IP20 |
| Temperatura operacional | -25 °C a +55 °C |
| Temperatura de armazenamento | -40 °C a +85 °C |
- Operating Principle & Características
- Operating Principle
Monitors the phase relationship of the three‑phase supply. When all three phases are present and the phase sequence is correct, the relay remains energized. If phase loss or incorrect phase sequence occurs, the relay de‑energizes immediately to trigger protection.
- Principais recursos
True RMS measurement ensures accurate detection even under non‑sinusoidal conditions
Regenerative voltage detection enables phase loss detection even when motor is rotating
Compactar 17.5 mm width saves control cabinet space
LED status indicator for quick fault diagnosis
No external power supply required; powered directly from the monitored three‑phase lines
- Aplicativos
Suitable for all types of equipment and systems requiring three‑phase power protection, incluindo:
Motor control circuits (prevents reverse rotation and phase‑loss burnout)
Elevators and lifting equipment
Air conditioning and refrigeration systems
Pumps and fan systems
Industrial automation production lines
Any electrical equipment requiring three‑phase power monitoring
- Instalação & Fiação
- Instalação
Mount on standard 35 mm trilho DIN
Ensure adequate ventilation; avoid installation near heat sources
- Fiação
Connect L1, L2, L3 to the three‑phase power supply
Connect NO (Normalmente aberto), NC (Normalmente fechado), COM (Comum) para o circuito de controle
- Replacement & Extended Models
| Replacement / Extended Model | Functional Difference |
| DPA51CM48 | 208–480 VAC, 2 SPDT outputs |
| DPA51CM54 | 480–690 VAC, 1 SPDT output |
| DPA51CM58 | 480–690 VAC, 2 SPDT outputs |
| DPA71 Series | Similar to DPA51, 35.5 mm width, extended functions |
| Chinese Brand Equivalents | GOLDAIR DPA51 series, Shanghai Fuji Electric DPA51CM44, etc.. |
- Ordering Information
| Manufacturer | Carlo Gavazzi |
| Modelo | DPA51CM44 |
| Standard Pack | 1 unit / box |
Operating Principle of DPA51CM44
The DPA51CM44 is a self‑powered three‑phase phase sequence & phase loss monitoring relay. Its core function is to continuously monitor voltages on L1/L2/L3, determine whether phase loss has occurred and whether phase sequence is correct, and output a protection signal via the internal relay.
- Power Supply Method
It does not require a separate external control power supply; it operates directly from the monitored three‑phase supply L1, L2, L3.
- Detection Logic
Internal circuitry continuously monitors between the three phases:
Presence of voltage (phase loss detection)
Correct 120° phase difference sequence (phase sequence detection)
- Operating Modes
- Normal Condition (all three phases present + correct phase sequence)
Internal detection circuit confirms normal condition → output relay energizes
→ NO contact closes, NC contact opens, equipment runs normally.
- Single‑phase or two‑phase loss
Voltage loss detected → relay immediately de‑energizes
→ control circuit is interrupted, providing protection.
- Reversed phase sequence (incorrect L1/L2/L3 order)
Abnormal phase relationship → relay de‑energizes
→ protection is triggered to prevent motor reverse rotation.
- Additional Features
True RMS measurement ensures accurate judgment under harmonic and non‑sinusoidal conditions.
Built‑in regenerative voltage detection identifies back EMF from motor inertia to avoid misoperation.
LED indicator: ON in normal condition, OFF in fault condition for on‑site troubleshooting.
The DPA51CM44 is a three‑phase phase sequence and phase loss protection relay suitable for 208-480 VAC. It can be used in any application using three‑phase AC power where reverse rotation or phase‑loss burnout must be avoided. Typical applications include:
- Motor Equipment (Mais Comum)
Fãs, bombas de água, oil pumps, circulation pumps
Air compressors, bombas de vácuo, compressores
Machine tool spindle motors, conveyor motors
Prevents winding burnout due to phase loss and motor reverse rotation caused by reversed phase sequence.
- AVAC & Refrigeration Equipment
Central air conditioning units, water chillers
Cooling tower fans, air‑source heat pumps
Industrial refrigeration units
Prevents damage to compressors and fans from reversed phase sequence.
- Lifting & Lifting Equipment
Elevadores, freight elevators, lifting platforms
Cranes, winches, guinchos
Reversed phase sequence causes immediate reverse operation, creating severe safety hazards, so monitoring is essential.
- Water Supply, Drainage & Fire Protection Systems
Fire pumps, sprinkler pumps, sewage pumps
Booster pumps, industrial circulation water systems
Ensures pumps do not reverse and shuts down promptly on phase loss.
- Linhas de produção automatizadas & Equipamento
Belt conveyors, roller lines, assembly lines
Máquinas de embalagem, food machinery, textile machinery
Injection molding machines, extrusoras, die‑casting machines
Maintains stable three‑phase power and avoids unexpected line stoppages or damage.
- Construção & Power Distribution Projects
Temporary three‑phase power on construction sites
Power monitoring in distribution cabinets and power boxes
Power distribution circuits in shopping malls and factories
Quickly detects abnormal incoming three‑phase power to prevent collective failure of downstream equipment.
Almost all electromechanical equipment powered by approximately three‑phase 380 V that must not reverse or run under phase loss can use the DPA51CM44 for power protection.
Carlo Gavazzi DPA Series Three‑Phase Monitoring Relay Model List
The Carlo Gavazzi DPA series focuses on three‑phase phase sequence and phase loss monitoring, with some models offering extended functions. Below is a complete list sorted by sub‑series, including key parameters and feature descriptions.
- Model Naming Convention
| Papel | Descrição |
| DPA | Series code (three‑phase phase sequence / phase loss monitoring) |
| XX | Sub‑series number (01, 51, 52, 55, 71, etc.) |
| CD | Function type (C = standard, D = special) |
| MXX | Supply & output specification |
| M44 = 208–480 VAC, 1 SPDT | |
| M48 = 208–480 VAC, 2 SPDT | |
| M54 = 480–690 VAC, 1 SPDT | |
| M58 = 480–690 VAC, 2 SPDT | |
| M23 = 24 CCV, 1 SPDT | |
| AVAC | Special version for A2L/A3 flammable refrigerant systems |
- Complete Model List by Sub‑Series
2.1 DPA01 / PPA01 Series (wide voltage range, including plug‑in PPA01)
| Modelo | Tensão de alimentação | Output | Montagem | Características |
| DPA01CM44 | 208–480 VAC | 1 SPDT | DIN rail | Padrão, phase sequence + perda de fase |
| DPA01CM60 | 208–600 VAC | 1 SPDT | DIN rail | Wide voltage range |
| DPA01CM69 | 208–690 VAC | 1 SPDT | DIN rail | Ultra‑wide voltage range |
| DPA01DM23 | 24 CCV | 1 SPDT | DIN rail | DC supply version |
| DPA01DM48 | 208–480 VAC | 2 SPDT | DIN rail | Dual output |
| PPA01CM44 | 208–480 VAC | 1 SPDT | Plug‑in | Padrão, plug‑in mounting |
| PPA01CM48 | 208–480 VAC | 2 SPDT | Plug‑in | Dual output |
| PPA01DM48 | 208–480 VAC | 2 SPDT | Plug‑in | Dual output special version |
2.2 DPA51 / DPA71 Series (compactar, 17.5 mm width)
| Modelo | Tensão de alimentação | Output | Montagem | Características |
| DPA51CM44 | 208–480 VAC | 1 SPDT | DIN rail | Padrão, ultra‑slim 17.5 milímetros |
| DPA51CM44HVAC | 208–480 VAC | 1 SPDT | DIN rail | For flammable refrigerant HVAC systems |
| DPA51CM48 | 208–480 VAC | 2 SPDT | DIN rail | Dual output |
| DPA51CM54 | 480–690 VAC | 1 SPDT | DIN rail | High‑voltage version |
| DPA51CM58 | 480–690 VAC | 2 SPDT | DIN rail | High‑voltage dual output |
| DPA71CM44 | 208–480 VAC | 1 SPDT | DIN rail | 35.5 mm width, extended functions |
| DPA71CM48 | 208–480 VAC | 2 SPDT | DIN rail | 35.5 mm width, dual output |
2.3 DPA52 Series (switching power supply, wide input range)
| Modelo | Tensão de alimentação | Output | Montagem | Características |
| DPA52CM44 | 125–624 VAC | 1 SPDT | DIN rail | Switching power supply, wide input |
| DPA52CM44HVAC | 125–624 VAC | 1 SPDT | DIN rail | For flammable refrigerant HVAC |
| DPA52CM48 | 125–624 VAC | 2 SPDT | DIN rail | Dual output |
| DPA52CM54 | 480–690 VAC | 1 SPDT | DIN rail | High‑voltage version |
| DPA52CM58 | 480–690 VAC | 2 SPDT | DIN rail | High‑voltage dual output |
2.4 DPA55 Series (with voltage monitoring)
| Modelo | Tensão de alimentação | Output | Montagem | Características |
| DPA55CM44 | 208–480 VAC | 1 SPDT | DIN rail | Phase sequence + perda de fase + voltage monitoring (±10% / ±15%) |
| DPA55CM48 | 208–480 VAC | 2 SPDT | DIN rail | Dual output with voltage monitoring |
| DPA55CM54 | 480–690 VAC | 1 SPDT | DIN rail | High‑voltage with voltage monitoring |
| DPA55CM58 | 480–690 VAC | 2 SPDT | DIN rail | High‑voltage dual output with voltage monitoring |
2.5 Other DPA Series Models
| Modelo | Série | Características |
| DPA03CM44 | DPA03 | Three‑phase phase sequence / perda de fase, extended functions |
| DPA03CM48 | DPA03 | Dual output, extended functions |
| DPA03CM69 | DPA03 | Ultra‑wide voltage range, extended functions |
- Key Feature Comparison
| Série | Largura | Fonte de energia | Função principal | Suitable Voltage |
| DPA51 | 17.5 milímetros | Self‑powered (monitored supply) | Phase sequence + perda de fase | 208–480 VAC |
| DPA71 | 35.5 milímetros | Self‑powered (monitored supply) | Phase sequence + perda de fase | 208–480 VAC |
| DPA01 | 35.5 milímetros | Self‑powered (monitored supply) | Phase sequence + perda de fase | 208–690 VAC |
| DPA52 | 35.5 milímetros | Switching power supply | Phase sequence + perda de fase | 125–624 VAC |
| DPA55 | 35.5 milímetros | Self‑powered (monitored supply) | Phase sequence + perda de fase + voltage monitoring | 208–690 VAC |
- Guia de seleção
- Space requirement: Choose DPA51 (17.5 milímetros) to save control cabinet space
- Faixa de tensão:
208-480 VAC: select models with suffix CM44 / CM48
480-690 VAC: select models with suffix CM54 / CM58
Ultra‑wide range: select CM60 / CM69 from DPA01 series
- Output requirement:
Single control loop: 1 SPDT (CM44 / CM54)
Dual control loops: 2 SPDT (CM48 / CM58)
- Special applications:
Flammable refrigerant HVAC systems: select models marked HVAC
Voltage monitoring required: select DPA55 series
