DPA51CM44 PHASE MONITORING RELAY

DPA51CM44 PHASE MONITORING RELAY – Premium 3-Phase Sequence and Phase Loss Protection Relay

The DPA51CM44 PHASE MONITORING RELAY is a highly compact, professional-grade electronic safety device engineered by Carlo Gavazzi to provide total protection for three-phase electrical systems. Designed to continuously monitor its own power supply, this three-phase mains monitoring relay immediately detects critical electrical fault conditions—including incorrect phase sequence, total phase loss, and partial phase loss. By instantly tripping when a fault occurs, it safeguards expensive downstream machinery like motors, compressors, and pumps from catastrophic failure or overheating.

Featuring a slim, space-saving design, the DPA51CM44 PHASE MONITORING RELAY operates over a broad nominal voltage range of $208text{ to }480text{ VAC}$ . Its advanced internal circuit layout utilizes a patented regenerated voltage detection algorithm. This ensures the relay can accurately identify a phase loss even if a running motor continues to regenerate voltage on the lost phase—a common fault that often tricks standard monitoring relays.

Key Features of DPA51CM44 PHASE MONITORING RELAY

Dual Fault Detection (Sequence & Loss): Provides complete mains safety by monitoring phase sequence alignment as well as total or partial phase failure.
Ultra-Slim 17.5 mm DIN-Rail Housing: Fits easily into crowded electrical panels, occupying minimal space on a standard DIN/EN 50022 mounting rail.
Self-Powered Operation: Eliminates the need for an external auxiliary power source by measuring and drawing operating power directly from the monitored phases ( $L_2$ and $L_3$ ).
Regenerated Voltage Suppression: Features an $85%$ phase-to-phase detection threshold, allowing it to shut down systems even under back-EMF feedback from spinning motors.
Normally Energized SPDT Output: Uses an SPDT electromechanical relay rated at $5text{ A}$ that de-energizes on alarm, ensuring fail-safe operations during complete power loss.
Clear LED Status Indicators: Features two distinct front-facing LEDs (Green for Power supply ON, Yellow for Relay output active) for immediate diagnostic feedback.

Applications and Usage of DPA51CM44 PHASE MONITORING RELAY

The compact footprint and high-speed tripping performance of the DPA51CM44 PHASE MONITORING RELAY make it an essential component across many industrial sectors:

Motor Control and Pump Panels: Installed ahead of contactors to prevent 3-phase industrial motors and water pumps from running on two phases (“single-phasing”), which rapidly burns out windings.
HVAC and Chiller Systems: Integrated into large air conditioning compressors and industrial chillers to ensure the scroll compressors never run in reverse due to an incorrect phase sequence.
Conveyor and Material Handling Systems: Used on assembly lines to prevent mechanical jams and physical danger caused by a conveyor belt running in the wrong physical direction.
Elevator and Escalator Control Panels: Deployed to guarantee that the traction motor only runs when the phase sequence is correct, securing passenger safety.

Technical Specifications

Parameter Specification	Technical Details & Engineering Ratings
Product Component Class	3-Phase Sequence & Phase Loss Monitoring Relay
Primary Target Keyword	DPA51CM44 PHASE MONITORING RELAY
Manufacturer Model Code	DPA51CM44
Nominal Voltage Range ( $U_e$ )	$208text{ to }480text{ VAC} pm 15%$ ( $177text{ to }552text{ VAC}$ absolute limits)
Operating Frequency Range	$45text{ to }65text{ Hz}$ sinusoidal wave
Contact Configuration	Single Pole Double Throw (SPDT) changeover contact
Contact Rating (AC-1 / DC-12)	$5text{ A} @ 250text{ VAC}$ / $5text{ A} @ 24text{ VDC}$
Alarm Trip Delay ON / OFF	Delay ON: $< 100text{ ms}$ \| Delay OFF: $$< 300text{ ms$
Power Consumption	$< 13text{ VA} @ 400text{ VAC}, 50text{ Hz}$
Housing Dimensions (W x H x D)	$17.5text{ mm} times 81.0text{ mm} times 67.2text{ mm}$
International Approvals	UL Listed, CSA Approved, CE Marked
Environmental Protection	IP20 rating with screw terminal connections

Benefits of the DPA51CM44 PHASE MONITORING RELAY

Drastically Lowers Equipment Downtime: By tripping motor starters in milliseconds during a phase failure, it prevents permanent damage and costly equipment replacements.
Saves Control Cabinet Space: Its ultra-thin $17.5text{ mm}$ design leaves extra room for circuit breakers and PLCs.
Worry-Free Automatic Resetting: Once the phase fault is cleared and line voltages return above $85%$ of the nominal rating, the relay automatically resets to restore system operation.

Installation and Wiring Guidelines

Mounting Step: Snap the DPA51CM44 PHASE MONITORING RELAY onto a standard symmetrical $35text{ mm}$ DIN rail.
Input Terminal Wiring: Connect the three monitored phase lines to terminals $L_1$ , $L_2$ , and $L_3$ using a maximum tightening torque of $0.8text{ Nm}$ .
Output Contact Connection: Wire terminals 11 (Common), 12 (Normally Closed), and 14 (Normally Open) into your motor starter’s control coil loop.
Power-Up Check: Verify that the green LED lights up (mains power is present) and the yellow LED glows (indicating a healthy phase sequence and output relay engaged).

To review official voltage range thresholds, technical wiring diagrams, and complete environmental certifications, check the Carlo Gavazzi Global Automation Support Portal.

To request a fast commercial quote or evaluate real-time regional warehouse stock availability for your immediate project needs, connect with our sales branch via the Control Qatar Contact Page.