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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.
- Model Code Explanation
| Part of Model | Descripción |
| DPA | Serie de productos (three‑phase monitoring relay) |
| 51 | Product type (phase sequence & phase loss monitoring) |
| do | Function type (standard version, monitors phase sequence and phase loss) |
| M44 | Supply and output specification (208–480 VAC, SPDT output) |
- Key Technical Specifications
| Parámetro | Especificación |
| Función | Three‑phase phase sequence monitoring, phase loss monitoring |
| Supply Voltage | 208–480 VAC (±15%), self‑powered from the monitored supply |
| Rango de medición | 177–550 VAC (phase‑to‑phase) |
| Rango de frecuencia | 50/60 Hz (±5%) |
| Producción | 1 SPDT relay, 5 A / 250 VACACIONES, energized in normal condition |
| Regenerative Voltage Detection | Detects regenerative voltage up to 85% of rated voltage |
| Montaje | Montaje en carril DIN (compliant with DIN/EN 50022) |
| Dimensiones | 17.5 × 81 × 67.2 milímetros (ultra‑slim design) |
| Clase de protección | IP20 |
| Temperatura de funcionamiento | -25 °C a +55 °C |
| Temperatura de almacenamiento | -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.
- Características principales
True RMS measurement ensures accurate detection even under non‑sinusoidal conditions
Regenerative voltage detection enables phase loss detection even when motor is rotating
Compacto 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
- Aplicaciones
Suitable for all types of equipment and systems requiring three‑phase power protection, incluido:
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
- Instalación & Alambrado
- Instalación
Mount on standard 35 carril DIN mm
Ensure adequate ventilation; avoid installation near heat sources
- Alambrado
Connect L1, L2, L3 to the three‑phase power supply
Connect NO (Normalmente abierto), CAROLINA DEL NORTE (Normalmente cerrado), COM (Común) al circuito de control
- Reemplazo & Extended Models
| Reemplazo / Extended Model | Diferencia funcional |
| 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 de ancho, extended functions |
| Equivalentes de marcas chinas | GOLDAIR DPA51 series, Shanghai Fuji Electric DPA51CM44, etc.. |
- Ordering Information
| Manufacturer | Carlo Gavazzi |
| Modelo | DPA51CM44 |
| Standard Pack | 1 unidad / 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)
- Modos de funcionamiento
- 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.
indicador LED: 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 VACACIONES. 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 (Más común)
aficionados, bombas de agua, oil pumps, circulation pumps
Compresores de aire, vacuum pumps, compresores
Machine tool spindle motors, conveyor motors
Prevents winding burnout due to phase loss and motor reverse rotation caused by reversed phase sequence.
- climatización & 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 & Equipo de elevación
Ascensores, freight elevators, lifting platforms
Cranes, winches, polipastos
Reversed phase sequence causes immediate reverse operation, creating severe safety hazards, so monitoring is essential.
- Water Supply, Drainage & Sistemas de protección contra incendios
Fire pumps, sprinkler pumps, sewage pumps
Booster pumps, industrial circulation water systems
Ensures pumps do not reverse and shuts down promptly on phase loss.
- Líneas de producción automatizadas & Equipo
Cintas transportadoras, roller lines, assembly lines
Maquinaria de embalaje, food machinery, maquinaria textil
Máquinas de moldeo por inyección, extrusoras, die‑casting machines
Maintains stable three‑phase power and avoids unexpected line stoppages or damage.
- Construcción & 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
| Parte | Descripción |
| DPA | código de serie (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 VCC, 1 SPDT | |
| climatización | Special version for A2L/A3 flammable refrigerant systems |
- Complete Model List by Sub‑Series
2.1 DPA01 / PPA01 Series (amplio rango de voltaje, including plug‑in PPA01)
| Modelo | Supply Voltage | Producción | Montaje | Características |
| DPA01CM44 | 208–480 VAC | 1 SPDT | Carril DIN | Estándar, phase sequence + pérdida de fase |
| DPA01CM60 | 208–600 VAC | 1 SPDT | Carril DIN | Wide voltage range |
| DPA01CM69 | 208–690 VAC | 1 SPDT | Carril DIN | Ultra‑wide voltage range |
| DPA01DM23 | 24 VCC | 1 SPDT | Carril DIN | DC supply version |
| DPA01DM48 | 208–480 VAC | 2 SPDT | Carril DIN | Dual output |
| PPA01CM44 | 208–480 VAC | 1 SPDT | Plug‑in | Estándar, montaje enchufable |
| 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 (compact, 17.5 mm de ancho)
| Modelo | Supply Voltage | Producción | Montaje | Características |
| DPA51CM44 | 208–480 VAC | 1 SPDT | Carril DIN | Estándar, ultra‑slim 17.5 milímetros |
| DPA51CM44HVAC | 208–480 VAC | 1 SPDT | Carril DIN | For flammable refrigerant HVAC systems |
| DPA51CM48 | 208–480 VAC | 2 SPDT | Carril DIN | Dual output |
| DPA51CM54 | 480–690 VAC | 1 SPDT | Carril DIN | High‑voltage version |
| DPA51CM58 | 480–690 VAC | 2 SPDT | Carril DIN | High‑voltage dual output |
| DPA71CM44 | 208–480 VAC | 1 SPDT | Carril DIN | 35.5 mm de ancho, extended functions |
| DPA71CM48 | 208–480 VAC | 2 SPDT | Carril DIN | 35.5 mm de ancho, salida dual |
2.3 DPA52 Series (switching power supply, wide input range)
| Modelo | Supply Voltage | Producción | Montaje | Características |
| DPA52CM44 | 125–624 VAC | 1 SPDT | Carril DIN | Switching power supply, wide input |
| DPA52CM44HVAC | 125–624 VAC | 1 SPDT | Carril DIN | For flammable refrigerant HVAC |
| DPA52CM48 | 125–624 VAC | 2 SPDT | Carril DIN | Dual output |
| DPA52CM54 | 480–690 VAC | 1 SPDT | Carril DIN | High‑voltage version |
| DPA52CM58 | 480–690 VAC | 2 SPDT | Carril DIN | High‑voltage dual output |
2.4 DPA55 Series (with voltage monitoring)
| Modelo | Supply Voltage | Producción | Montaje | Características |
| DPA55CM44 | 208–480 VAC | 1 SPDT | Carril DIN | Phase sequence + pérdida de fase + voltage monitoring (±10% / ±15%) |
| DPA55CM48 | 208–480 VAC | 2 SPDT | Carril DIN | Dual output with voltage monitoring |
| DPA55CM54 | 480–690 VAC | 1 SPDT | Carril DIN | High‑voltage with voltage monitoring |
| DPA55CM58 | 480–690 VAC | 2 SPDT | Carril DIN | High‑voltage dual output with voltage monitoring |
2.5 Other DPA Series Models
| Modelo | Serie | Características |
| DPA03CM44 | DPA03 | Three‑phase phase sequence / pérdida de fase, extended functions |
| DPA03CM48 | DPA03 | Dual output, extended functions |
| DPA03CM69 | DPA03 | Ultra‑wide voltage range, extended functions |
- Key Feature Comparison
| Serie | Ancho | Fuente de alimentación | Función principal | Suitable Voltage |
| DPA51 | 17.5 milímetros | Self‑powered (monitored supply) | Phase sequence + pérdida de fase | 208–480 VAC |
| DPA71 | 35.5 milímetros | Self‑powered (monitored supply) | Phase sequence + pérdida de fase | 208–480 VAC |
| DPA01 | 35.5 milímetros | Self‑powered (monitored supply) | Phase sequence + pérdida de fase | 208–690 VAC |
| DPA52 | 35.5 milímetros | Switching power supply | Phase sequence + pérdida de fase | 125–624 VAC |
| DPA55 | 35.5 milímetros | Self‑powered (monitored supply) | Phase sequence + pérdida de fase + voltage monitoring | 208–690 VAC |
- Guía de selección
- Space requirement: Choose DPA51 (17.5 milímetros) to save control cabinet space
- Rango de voltaje:
208-480 VACACIONES: select models with suffix CM44 / CM48
480-690 VACACIONES: 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
