Feature of UBZ-304
- Comprehensive Monitoring: Continuously monitors mains voltage parameters, RMS phase/line currents, and motor insulation resistance.
- Customizable Protection: Offers over 90 programmable parameters, including variable trip and auto-reset delays, to tailor protection to specific motor applications.
- User-Friendly Interface: A four-line backlit LCD provides clear information and simplifies programming from the front panel.
- Remote Connectivity: Built-in RS-232 and RS-485 Modbus communication enables integration with DCS/SCADA systems for real-time monitoring, programming, and remote control.
- PC Software: Includes free PC software for remote monitoring and configuration.
- Compact Design: Fits standard 96x96x78.3mm panel cutouts for easy installation.
Protection function of UBZ-304
Overcurrent Protection:
Phase Overcurrent: Protects against excessive current in each phase.
Ground Fault Protection: Detects and responds to ground faults.
Phase Current Asymmetry: Monitors for imbalances in phase currents, indicative of potential issues.
Negative Sequence Current Protection: Protects against negative sequence currents, which can lead to overheating and damage.
Thermal Overload Protection: Monitors motor temperature and trips to prevent overheating.
Undercurrent Protection:
Undercurrent Protection: Detects and responds to low current conditions, such as dry-running.
Delayed Starting Protection: Prevents motor damage due to prolonged starting times or rotor blocking.
Voltage Protection:
Overvoltage Protection: Protects against excessive voltage levels.
Undervoltage Protection: Protects against low voltage conditions.
Voltage Imbalance Protection: Monitors for voltage imbalances between phases.
Phase Sequence Protection: Detects incorrect phase sequence, which can damage the motor.
Frequency Protection: Monitors for deviations in supply frequency.
Insulation Monitoring:
Insulation Resistance Monitoring: Monitors the insulation resistance of the motor windings to prevent insulation breakdown.
Phase Loss Protection: Detects the loss of one or two phases, preventing motor damage.
Specification of UBZ-304
| Description | Value |
| Application of the unit | Switchgear and control gear; induction motor protection control; Three-phase LT motor protection |
| Design (installation) type | Flush 96 x 96 mm |
| Protection rating of the front panel | IP64 |
| Protection rating of housing | IP10 |
| Climatic version | NC 3.1 |
| Contamination level | II |
| Overvoltage category | II |
| Rated voltage of insulation, V | 450 |
| Rated impulse withstand voltage, kV | 2.5 |
| Electric shock protection class | II |
| Wire cross section for connection to terminals, mm2 | 0.5-2 |
| Torque for terminal screws, N*m | 0.4 |
| Power (Watts or HP) | 2.5 – 315 kW (4 – 500 HP) |
| Motor votage | 380 – 415 V AC |
| Phase | Three Phase |
| Speed (Rpm) | Any |
| Voltage Type | AC |
| Operating Voltage (V) | 320 – 480 V |
| Number of Poles | 3 Pole, 4 Pole |
| Rated Current (Amps) | 5A to 630A programmable |
| Output Type | Functional – SPDT (1NO + 1NC) and Power – DPDT (2NO + 2NC) |
