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Single Phasing Preventers (SPP)
Motor Guard Relay
Liquid Level Controller
Single Phase & Three Phase Electronic Starters
Overload relay
Earth Leakage Relay(ELR)
Industrial Energy Saving Tube Fittings & Ballasts
Industrial Lighting Fixtures
Automatic Light Control Switch (Auto photo)
Servo Voltage Stabilizer
Digital Time Switch
Temperature Controller /
Temperature Indicator
Analog Timers
Panel Meters
Whitez Modular Switches
Servo Voltage Regulators (SCVR)
System Monitoring Relays
Digital Timer
Phase Failure Relays / Motor-Pump Protection Relays
GELCO has developed prodless type pumppro unit which is basically current sensing single phasing which can protect the submersible pumps against overloading, dry running, unbalanced currents, reverse phasing and single phasing up to motor terminal. As it is prodless, it eliminates external sensing prod. With the use of this unit. Bimetallic overload relays and single phasing preventers are not required.
Thus it offers comprehensive protection to submersible pumps and also saves cost by eliminating thermal overload relay, separate single phasing preventer, water level guard and cable for sensor. It is available up to 200 amps. Green led indicates spp healthy condition and red led indicates overloading condition. Auto / manual / remote reset provision is provided for overloading. It weighs 750 grams approx. And measures 140 x 100 x 95mm (overall). Mounting dimensions is 129 x 74mm.


PUMPPRO is a negative sequence current sensing SPP with single phasing, overload(over current) and dry run (under current) protections. Overload setting needs to be set as per current rating of the pump & Dry Run setting needs to be as per no load current of pump. PUMPPRO offers dry run protection without need of the prod.

Technical Specifications

System Voltage : 415V +/- 20%, 3, 50 Hz.
Auxiiary Supply : 415V/230/110 V AC, 50 Hz.
Output contact rating : 1 C/O potential free,6A resistive at 230V or 1 A at 415V at 0.5 P.F.
Trip Setting    
Unbalanced : 50% of rated maximum current.
Dry Run(under current) : Variable between 50-75% at set overload current
Overload : 120% of the full load current for that adjustable potentiometer provided on the unit.
Trip Time Delay    
For Single Phasing, Reverse : 4 to 7 Seconds
Dry Run : 15-18 Seconds
For Overload : As per inverse time current characteristics(2sec. standard & 6/10sec. on request)
Reset : Auto/Manual/Remote for each SPP,O/L & Dry Run selection
Power Consumption : 3 VA
Recommended Wiring : 1.0
H.V Test : 2 KV AC, 50 Hz for 1 minute between mounting plate and any terminal.
Fail Safe : Relay is energised in healthy conditions and trips in faulty conditions.
Humidity : Up to 95% RH
Enclosure : High impact polystyrene modulded with nylon moulded connection strip.
Life Expectancy : 0.5*100000 operations
Overall : 140 X 100 X 95 mm
Mounting : 129 X 74 mm.
CT Dimension    
Inbuilt : 16 mm ID
Separate : 31 mm ID
Weight : 750 gms(approx.)

Terminal Marking

1-2 Auxilary Supply.
3-4 Remote reset normally open push button(if required).
5-4 Relay-N/O contact. Contact in series of N/V coil.
7-8 Link-Remove link to make SPP reset automatic.
9-10 Link-Remove link to make overload reset automatic.
11-12 Link-Remove link to make dry run reset automatic.


Dotted line shown here goes through the two PVC pipes internally to the pumppro unit
In healthy conditions relay is energised.
If starter does not hold, interchange R & B wire passing through pumppro unit.
To changed direction of rotation of motor interchange wires on motor side.
Set overload current setting property (120% of motor current).if overload setting is higher it may mistrip starter in dry running.
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