Siemens SIRIUS 3UG5 Monitoring Relays

Siemens SIRIUS 3UG5 Monitoring Relays Suppliers, Exporters in India

Siemens SIRIUS 3UG5 Monitoring Relays are used to keep a check on electrical supply conditions, motor loads and other operating values inside industrial systems. They help identify faults before they damage motors, compressors, pumps, conveyors or other connected equipment.

The 3UG5 range covers several monitoring duties under one series. Depending on the selected model, the relay can monitor phase sequence, phase failure, phase imbalance, under-voltage, overvoltage, frequency, current, power factor, active current, power, speed or liquid level. Siemens also offers models for DC load monitoring.

These relays are commonly installed in motor control panels, machine panels, pump panels, compressor systems and power distribution boards. When a measured value moves outside the set limit, the relay can give an alarm or switch the connected circuit off. Adjustable delay settings help avoid unnecessary tripping during short voltage dips, starting current or temporary load changes.

The newer digital versions come with a display and front operating buttons, making it easier to view measured values, set limits, and identify the reason for a fault. Selected models also support IO-Link, allowing measured values, diagnostics and device settings to be transferred to a PLC or higher-level automation system.

ARP IMPEX supplies and exports Siemens SIRIUS 3UG5 Monitoring Relays for new panels, industrial projects and replacement requirements. Share the complete Siemens article number or the value you need to monitor for price, availability and suitable model selection.

Technical Specifications

• Brand: Siemens
• Product range: SIRIUS
• Series: 3UG5
• Product type: Electrical and mechanical monitoring relay
• Available versions: Analogue and digitally adjustable models
• Monitoring functions: Phase sequence, phase failure, phase imbalance, voltage, frequency, current, power factor, active current, power, speed and liquid level
• Network types: Single-phase and three-phase systems, depending on the model
• Voltage monitoring: Under-voltage, overvoltage or window monitoring
• Current monitoring: Under-current, overcurrent or range monitoring
• Line voltage range: Up to 690 V on selected three-phase monitoring models
• Frequency range: 15 to 70 Hz on selected line-monitoring models
• Control supply: AC, DC or wide-range AC/DC, depending on the article number
• Output contacts: Relay outputs, depending on the selected version
• Communication: IO-Link available on selected models
• Display: Digital display on applicable versions
• Setting options: Front controls, display menu or IO-Link, depending on the model
• Delay settings: Adjustable start-up and tripping delays on applicable models
• Reset options: Automatic or manual reset, depending on the selected relay
• Mounting: DIN rail mounting
• Installation area: Control panels, switchboards and industrial electrical cabinets

The exact measuring range, contact arrangement, control voltage and communication option depend on the complete Siemens part number. Selected line-monitoring models cover three-phase networks up to 690 V and frequencies from 15 to 70 Hz.

Main Monitoring Functions

Phase and Line Monitoring

Siemens 3UG5 line-monitoring relays check whether the phases are available and connected in the correct sequence. Depending on the version, they can also monitor phase imbalance, neutral conductor failure, voltage and frequency.

These models are useful where incorrect phase sequence or poor incoming supply can damage rotating equipment. Selected versions can also correct the direction of rotation automatically.

Voltage and Current Monitoring

Voltage-monitoring models check whether the supply remains within the selected operating limits. Current-monitoring relays can identify overload, underload, dry running, wire breakage or an unexpected change in machine load.

This is useful for pumps, fans, conveyors and other equipment where a change in current often gives an early indication of a mechanical or process problem.

Power Factor and Load Monitoring

Power factor, active current and power monitoring can give a clearer view of the actual motor load. These relays can help identify no-load operation, overload, belt failure, pump dry running or loss of mechanical load without installing a separate mechanical sensor.

Speed and Level Monitoring

Speed-monitoring versions receive pulses from a sensor and check whether a shaft, conveyor or driven component is rotating within the required range. Level-monitoring models work with suitable probes to control or monitor conductive liquids in tanks, sumps and process vessels.

Features

• Monitors important electrical and mechanical operating values
• Helps detect supply faults before they damage connected equipment
• Available for single-phase and three-phase applications
• Adjustable upper and lower monitoring limits
• Start-up delay prevents tripping while a motor is accelerating
• Adjustable tripping delay filters short disturbances
• Digital models show the measured value and fault condition
• Teaching function simplifies limit setting on applicable versions
• IO-Link models send measured values and diagnostics to the control system
• Wide measuring and supply-voltage options reduce the number of models required
• Suitable for alarm generation or direct equipment shutdown
• DIN rail construction fits standard industrial control panels
• Safety-certified line-monitoring versions are available for selected requirements
• Useful for both new panel construction and older relay replacement

Siemens offers several combinations of measuring functions, output contacts, displays and communication options within the 3UG5 range, so the complete article number should be confirmed before ordering.

Applications

• Siemens SIRIUS 3UG5 Monitoring Relays are commonly used in:
• Motor control panels
• Pump dry-run and overload protection
• Compressor control systems
• Conveyor belt monitoring
• Phase sequence and phase failure protection
• Voltage and frequency monitoring
• Generator monitoring panels
• HVAC and refrigeration systems
• Cranes and lifting equipment
• Elevators and escalators
• Machine automation panels
• Fans and ventilation equipment
• Water and wastewater treatment plants
• Tank and conductive liquid level control
• Packaging and production machinery
• Process plants
• Power distribution boards
• Mobile machinery
• Wind power and energy systems
• Industrial maintenance and replacement work

Siemens specifically lists critical power supplies, compressors, cranes, elevators, mobile machinery and systems operating on unstable networks among the uses for 3UG5 line-monitoring relays.

Siemens 3UG5 Monitoring Relay Supplier and Exporter

ARP IMPEX supplies Siemens SIRIUS 3UG5 Monitoring Relays for panel builders, machine manufacturers, EPC contractors, industrial plants and maintenance companies.

The 3UG5 series is replacing the older Siemens 3UG4 monitoring relay range. For replacement requirements, share the complete old and new part numbers wherever available. A replacement should not be selected only by supply voltage, as the monitoring function, measuring range, output contacts, and terminal arrangement must also match.