Single Phase Motor Protection Device UBZ-115
Universal Single Phase Induction Electric Motor Protection Unit UBZ-115 is a microprocessor unit. UBZ-115 provides protection to single-phase induction electric motors with power up to 5.5 kW (25Ð). The UBZ-115 unit is designed to provide permanent control of mains voltage parameters and current effective value, which is consumed by the 230V/50Hz motor. In the UBZ-115 provides an external input for remote start or stop the motor, and feature "soft start" the motor up to 5 seconds. UBZ-115 provides protection in the following situations:
 when the mains voltage is of poor quality (over & under voltage);
 mechanical overloads of the motor (over current);
 when motor torque is lost ("dry stroke");
 delayed start or rotor jamming;
 thermal overload (thermal model of the motor).
For each separate type of fault, the unit allows to enable or disable an automatic reset (AR) of the motor.
Main technical specifications:
Rated single phase supply voltage, V ~230
Minimum/maximum functional voltage, V 130 – 300
Protection against current overload (currents greater than 40A) yes
MCB (Miniature Circuit Breaker), A 32 (class B)
Mains frequency, Hz 48 – 62
Harmonical configuration (nonsinusoidality) of power supply voltage EN 61000-3-2
(IEC 1000-3-2)
Maximum load capacity, kW 5.5
Rated current, Ð 25
Maximum allowable start current, A 40
Trip threshold accuracy for current, ≤, % of rated current 3
Trip threshold accuracy for voltage, ≤, V 3
Hysteresis return on voltage, ≤, V 4
Data storage term, years, not less than 10
Current consumption (at 220 V), ≤, mA 200
Weight, ≤, kg 2.6
Overall dimensions, mm 252 Ñ… 188 Ñ… 125
Remote control (water level sensor) input Clean contact
Motor control through Relay 40A, 240V
Triac 40A, 800V
Output connections starting capacitor Triac 40A, 800V
Device allocation Control equipment and distribution
Typical operation Continued
Device level protection IP30
Index protection of electrical shock 0I
Climatic modification UHL3.1
Permissible degree of pollution II
Overvoltage category II
Nominal voltage of isolation, V 450
Rated impulse withstand voltage, kV 2.5