Contattore,interruttore automatico,inverter solare,contatore elettrico,batterie solari
Three-Phase Phase Sequence & Relè di monitoraggio della perdita di fase
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.
- Spiegazione del codice modello
| Parte del modello | Descrizione |
| DPA | Serie di prodotti (three‑phase monitoring relay) |
| 51 | Tipo di prodotto (sequenza di fasi & phase loss monitoring) |
| C | Tipo di funzione (versione standard, monitors phase sequence and phase loss) |
| M44 | Supply and output specification (208–480 VAC, SPDT output) |
- Specifiche tecniche principali
| Parametro | Specifica |
| Funzione | Three‑phase phase sequence monitoring, phase loss monitoring |
| Tensione di alimentazione | 208–480 VAC (±15%), self‑powered from the monitored supply |
| Campo di misura | 177–550 VAC (phase‑to‑phase) |
| Gamma di frequenza | 50/60 Hz (±5%) |
| Produzione | 1 SPDT relay, 5 UN / 250 VCA, energized in normal condition |
| Regenerative Voltage Detection | Detects regenerative voltage up to 85% della tensione nominale |
| Montaggio | Montaggio su guida DIN (compliant with DIN/EN 50022) |
| Dimensioni | 17.5 × 81 × 67.2 mm (ultra‑slim design) |
| Classe di protezione | IP20 |
| Temperatura operativa | -25 °C a +55 °C |
| Temperatura di conservazione | -40 °C a +85 °C |
- Principio di funzionamento & Caratteristiche
- Principio di funzionamento
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.
- Caratteristiche principali
True RMS measurement ensures accurate detection even under non‑sinusoidal conditions
Regenerative voltage detection enables phase loss detection even when motor is rotating
Compatto 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
- Applicazioni
Suitable for all types of equipment and systems requiring three‑phase power protection, compreso:
Motor control circuits (prevents reverse rotation and phase‑loss burnout)
Elevators and lifting equipment
Air conditioning and refrigeration systems
Pumps and fan systems
Linee di produzione di automazione industriale
Any electrical equipment requiring three‑phase power monitoring
- Installazione & Cablaggio
- Installazione
Mount on standard 35 Guida DIN da mm
Ensure adequate ventilation; avoid installation near heat sources
- Cablaggio
Collega L1, L2, L3 to the three‑phase power supply
Connect NO (Normalmente aperto), NC (Normalmente chiuso), COM (Comune) al circuito di controllo
- Sostituzione & Extended Models
| Sostituzione / Extended Model | Differenza funzionale |
| 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 larghezza mm, funzioni estese |
| Chinese Brand Equivalents | GOLDAIR DPA51 series, Shanghai Fuji Electric DPA51CM44, ecc. |
- Informazioni sull'ordinazione
| Produttore | Carlo Gavazzi |
| Modello | DPA51CM44 |
| Standard Pack | 1 unità / 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 + corretta sequenza delle fasi)
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.
- Funzionalità aggiuntive
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 VCA. 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 (Più comune)
Tifosi, pompe dell'acqua, pompe dell'olio, circulation pumps
Compressori d'aria, vacuum pumps, compressori
Machine tool spindle motors, conveyor motors
Prevents winding burnout due to phase loss and motor reverse rotation caused by reversed phase sequence.
- HVAC & Refrigeration Equipment
Central air conditioning units, refrigeratori d'acqua
Cooling tower fans, air‑source heat pumps
Industrial refrigeration units
Prevents damage to compressors and fans from reversed phase sequence.
- Sollevamento & Attrezzature di sollevamento
Ascensori, freight elevators, piattaforme di sollevamento
Gru, winches, montacarichi
Reversed phase sequence causes immediate reverse operation, creating severe safety hazards, so monitoring is essential.
- Water Supply, Drenaggio & 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.
- Linee di produzione automatizzate & Attrezzatura
Trasportatori a nastro, linee a rulli, assembly lines
Macchine per l'imballaggio, macchine alimentari, macchine tessili
Macchine per stampaggio ad iniezione, estrusori, die‑casting machines
Maintains stable three‑phase power and avoids unexpected line stoppages or damage.
- Construction & 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.
- Convenzione di denominazione dei modelli
| Parte | Descrizione |
| DPA | Codice della serie (three‑phase phase sequence / phase loss monitoring) |
| XX | Sub‑series number (01, 51, 52, 55, 71, ecc.) |
| CD | Tipo di funzione (C = standard, D = special) |
| MXX | Fornitura & 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 VCC, 1 SPDT | |
| HVAC | Special version for A2L/A3 flammable refrigerant systems |
- Complete Model List by Sub‑Series
2.1 DPA01 / PPA01 Series (ampio intervallo di tensione, including plug‑in PPA01)
| Modello | Tensione di alimentazione | Produzione | Montaggio | Caratteristiche |
| DPA01CM44 | 208–480 VAC | 1 SPDT | Guida DIN | Standard, sequenza di fasi + perdita di fase |
| DPA01CM60 | 208–600 VAC | 1 SPDT | Guida DIN | Ampio intervallo di tensione |
| DPA01CM69 | 208–690 VAC | 1 SPDT | Guida DIN | Ultra‑wide voltage range |
| DPA01DM23 | 24 VCC | 1 SPDT | Guida DIN | DC supply version |
| DPA01DM48 | 208–480 VAC | 2 SPDT | Guida DIN | Dual output |
| PPA01CM44 | 208–480 VAC | 1 SPDT | Collegare | Standard, plug‑in mounting |
| PPA01CM48 | 208–480 VAC | 2 SPDT | Collegare | Dual output |
| PPA01DM48 | 208–480 VAC | 2 SPDT | Collegare | Dual output special version |
2.2 DPA51 / DPA71 Series (compatto, 17.5 larghezza mm)
| Modello | Tensione di alimentazione | Produzione | Montaggio | Caratteristiche |
| DPA51CM44 | 208–480 VAC | 1 SPDT | Guida DIN | Standard, ultra‑slim 17.5 mm |
| DPA51CM44HVAC | 208–480 VAC | 1 SPDT | Guida DIN | For flammable refrigerant HVAC systems |
| DPA51CM48 | 208–480 VAC | 2 SPDT | Guida DIN | Dual output |
| DPA51CM54 | 480–690 VAC | 1 SPDT | Guida DIN | High‑voltage version |
| DPA51CM58 | 480–690 VAC | 2 SPDT | Guida DIN | High‑voltage dual output |
| DPA71CM44 | 208–480 VAC | 1 SPDT | Guida DIN | 35.5 larghezza mm, funzioni estese |
| DPA71CM48 | 208–480 VAC | 2 SPDT | Guida DIN | 35.5 larghezza mm, doppia uscita |
2.3 DPA52 Series (switching power supply, wide input range)
| Modello | Tensione di alimentazione | Produzione | Montaggio | Caratteristiche |
| DPA52CM44 | 125–624 VAC | 1 SPDT | Guida DIN | Switching power supply, wide input |
| DPA52CM44HVAC | 125–624 VAC | 1 SPDT | Guida DIN | For flammable refrigerant HVAC |
| DPA52CM48 | 125–624 VAC | 2 SPDT | Guida DIN | Dual output |
| DPA52CM54 | 480–690 VAC | 1 SPDT | Guida DIN | High‑voltage version |
| DPA52CM58 | 480–690 VAC | 2 SPDT | Guida DIN | High‑voltage dual output |
2.4 DPA55 Series (with voltage monitoring)
| Modello | Tensione di alimentazione | Produzione | Montaggio | Caratteristiche |
| DPA55CM44 | 208–480 VAC | 1 SPDT | Guida DIN | Sequenza di fasi + perdita di fase + voltage monitoring (±10% / ±15%) |
| DPA55CM48 | 208–480 VAC | 2 SPDT | Guida DIN | Dual output with voltage monitoring |
| DPA55CM54 | 480–690 VAC | 1 SPDT | Guida DIN | High‑voltage with voltage monitoring |
| DPA55CM58 | 480–690 VAC | 2 SPDT | Guida DIN | High‑voltage dual output with voltage monitoring |
2.5 Other DPA Series Models
| Modello | Serie | Caratteristiche |
| DPA03CM44 | DPA03 | Three‑phase phase sequence / perdita di fase, funzioni estese |
| DPA03CM48 | DPA03 | Dual output, funzioni estese |
| DPA03CM69 | DPA03 | Ultra‑wide voltage range, funzioni estese |
- Key Feature Comparison
| Serie | Larghezza | Alimentazione elettrica | Funzione fondamentale | Suitable Voltage |
| DPA51 | 17.5 mm | Self‑powered (monitored supply) | Sequenza di fasi + perdita di fase | 208–480 VAC |
| DPA71 | 35.5 mm | Self‑powered (monitored supply) | Sequenza di fasi + perdita di fase | 208–480 VAC |
| DPA01 | 35.5 mm | Self‑powered (monitored supply) | Sequenza di fasi + perdita di fase | 208–690 VAC |
| DPA52 | 35.5 mm | Switching power supply | Sequenza di fasi + perdita di fase | 125–624 VAC |
| DPA55 | 35.5 mm | Self‑powered (monitored supply) | Sequenza di fasi + perdita di fase + voltage monitoring | 208–690 VAC |
- Guida alla selezione
- Space requirement: Choose DPA51 (17.5 mm) to save control cabinet space
- Intervallo di tensione:
208-480 VCA: select models with suffix CM44 / CM48
480-690 VCA: 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
