Контактор,автоматический выключатель,солнечный инвертор,электрический счетчик,солнечные батареи
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 | Описание |
| DPA | Серия продуктов (three‑phase monitoring relay) |
| 51 | Product type (последовательность фаз & phase loss monitoring) |
| С | Function type (стандартная версия, monitors phase sequence and phase loss) |
| M44 | Supply and output specification (208–480 VAC, SPDT output) |
- Основные технические характеристики
| Параметр | Спецификация |
| Функция | Three‑phase phase sequence monitoring, phase loss monitoring |
| Напряжение питания | 208–480 VAC (±15%), self‑powered from the monitored supply |
| Measuring Range | 177–550 VAC (phase‑to‑phase) |
| Frequency Range | 50/60 Гц (±5%) |
| Выход | 1 SPDT relay, 5 А / 250 ВАК, energized in normal condition |
| Regenerative Voltage Detection | Detects regenerative voltage up to 85% of rated voltage |
| Монтаж | Монтаж на DIN-рейку (compliant with DIN/EN 50022) |
| Размеры | 17.5 × 81 × 67.2 мм (ultra‑slim design) |
| Класс защиты | IP20 |
| Рабочая температура | -25 °С до +55 °С |
| Температура хранения | -40 °С до +85 °С |
- Принцип работы & Функции
- Принцип работы
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.
- Основные характеристики
True RMS measurement ensures accurate detection even under non‑sinusoidal conditions
Regenerative voltage detection enables phase loss detection even when motor is rotating
Компактный 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
- Приложения
Suitable for all types of equipment and systems requiring three‑phase power protection, включая:
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
- Установка & Электропроводка
- Установка
Mount on standard 35 мм DIN-рейка
Ensure adequate ventilation; avoid installation near heat sources
- Электропроводка
Подключить L1, Л2, L3 to the three‑phase power supply
Connect NO (Нормально открытый), Северная Каролина (Нормально закрытый), КОМ (Общий) to the control circuit
- Замена & Extended Models
| Замена / 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 ширина мм, extended functions |
| Chinese Brand Equivalents | GOLDAIR DPA51 series, Shanghai Fuji Electric DPA51CM44, и т. д.. |
- Информация для заказа
| Производитель | Carlo Gavazzi |
| Модель | DPA51CM44 |
| Standard Pack | 1 единица / 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, Л2, 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)
- Режимы работы
- Нормальное состояние (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.
Светодиодный индикатор: 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 ВАК. 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 (Самый распространенный)
Фанаты, водяные насосы, масляные насосы, circulation pumps
Воздушные компрессоры, vacuum pumps, компрессоры
Machine tool spindle motors, conveyor motors
Prevents winding burnout due to phase loss and motor reverse rotation caused by reversed phase sequence.
- ОВК & 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
Лифты, freight elevators, lifting platforms
Cranes, winches, hoists
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.
- Автоматизированные производственные линии & Equipment
Belt conveyors, roller lines, assembly lines
Packaging machinery, food machinery, текстильное оборудование
Машины для литья под давлением, extruders, 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.
- Model Naming Convention
| Часть | Описание |
| DPA | Код серии (three‑phase phase sequence / phase loss monitoring) |
| XX | Sub‑series number (01, 51, 52, 55, 71, и т. д.) |
| C/D | Function type (C = standard, D = special) |
| MXX | Поставлять & 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 В постоянного тока, 1 SPDT | |
| ОВК | Special version for A2L/A3 flammable refrigerant systems |
- Complete Model List by Sub‑Series
2.1 DPA01 / PPA01 Series (широкий диапазон напряжения, including plug‑in PPA01)
| Модель | Напряжение питания | Выход | Монтаж | Функции |
| DPA01CM44 | 208–480 VAC | 1 SPDT | DIN-рейка | Стандартный, последовательность фаз + потеря фазы |
| DPA01CM60 | 208–600 VAC | 1 SPDT | DIN-рейка | Широкий диапазон напряжения |
| DPA01CM69 | 208–690 VAC | 1 SPDT | DIN-рейка | Ultra‑wide voltage range |
| DPA01DM23 | 24 В постоянного тока | 1 SPDT | DIN-рейка | DC supply version |
| DPA01DM48 | 208–480 VAC | 2 SPDT | DIN-рейка | Dual output |
| PPA01CM44 | 208–480 VAC | 1 SPDT | Plug‑in | Стандартный, вставной монтаж |
| 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 ширина мм)
| Модель | Напряжение питания | Выход | Монтаж | Функции |
| DPA51CM44 | 208–480 VAC | 1 SPDT | DIN-рейка | Стандартный, ultra‑slim 17.5 мм |
| DPA51CM44HVAC | 208–480 VAC | 1 SPDT | DIN-рейка | For flammable refrigerant HVAC systems |
| DPA51CM48 | 208–480 VAC | 2 SPDT | DIN-рейка | Dual output |
| DPA51CM54 | 480–690 VAC | 1 SPDT | DIN-рейка | High‑voltage version |
| DPA51CM58 | 480–690 VAC | 2 SPDT | DIN-рейка | High‑voltage dual output |
| DPA71CM44 | 208–480 VAC | 1 SPDT | DIN-рейка | 35.5 ширина мм, extended functions |
| DPA71CM48 | 208–480 VAC | 2 SPDT | DIN-рейка | 35.5 ширина мм, dual output |
2.3 DPA52 Series (switching power supply, wide input range)
| Модель | Напряжение питания | Выход | Монтаж | Функции |
| DPA52CM44 | 125–624 VAC | 1 SPDT | DIN-рейка | Switching power supply, wide input |
| DPA52CM44HVAC | 125–624 VAC | 1 SPDT | DIN-рейка | For flammable refrigerant HVAC |
| DPA52CM48 | 125–624 VAC | 2 SPDT | DIN-рейка | Dual output |
| DPA52CM54 | 480–690 VAC | 1 SPDT | DIN-рейка | High‑voltage version |
| DPA52CM58 | 480–690 VAC | 2 SPDT | DIN-рейка | High‑voltage dual output |
2.4 DPA55 Series (with voltage monitoring)
| Модель | Напряжение питания | Выход | Монтаж | Функции |
| DPA55CM44 | 208–480 VAC | 1 SPDT | DIN-рейка | Phase sequence + потеря фазы + voltage monitoring (±10% / ±15%) |
| DPA55CM48 | 208–480 VAC | 2 SPDT | DIN-рейка | Dual output with voltage monitoring |
| DPA55CM54 | 480–690 VAC | 1 SPDT | DIN-рейка | High‑voltage with voltage monitoring |
| DPA55CM58 | 480–690 VAC | 2 SPDT | DIN-рейка | High‑voltage dual output with voltage monitoring |
2.5 Other DPA Series Models
| Модель | Ряд | Функции |
| DPA03CM44 | DPA03 | Three‑phase phase sequence / потеря фазы, extended functions |
| DPA03CM48 | DPA03 | Dual output, extended functions |
| DPA03CM69 | DPA03 | Ultra‑wide voltage range, extended functions |
- Key Feature Comparison
| Ряд | Ширина | Источник питания | Основная функция | Suitable Voltage |
| DPA51 | 17.5 мм | Self‑powered (monitored supply) | Phase sequence + потеря фазы | 208–480 VAC |
| DPA71 | 35.5 мм | Self‑powered (monitored supply) | Phase sequence + потеря фазы | 208–480 VAC |
| DPA01 | 35.5 мм | Self‑powered (monitored supply) | Phase sequence + потеря фазы | 208–690 VAC |
| DPA52 | 35.5 мм | Switching power supply | Phase sequence + потеря фазы | 125–624 VAC |
| DPA55 | 35.5 мм | Self‑powered (monitored supply) | Phase sequence + потеря фазы + voltage monitoring | 208–690 VAC |
- Руководство по выбору
- Space requirement: Choose DPA51 (17.5 мм) to save control cabinet space
- Voltage range:
208-480 ВАК: select models with suffix CM44 / CM48
480-690 ВАК: select models with suffix CM54 / CM58
Сверхширокий диапазон: select CM60 / CM69 from DPA01 series
- Output requirement:
Single control loop: 1 SPDT (CM44 / CM54)
Dual control loops: 2 SPDT (CM48 / CM58)
- Специальные приложения:
Flammable refrigerant HVAC systems: select models marked HVAC
Voltage monitoring required: select DPA55 series
