Cable Size - use copper (Cu)
Motor Rating
(kW)
Maximum Cable Size
5
(mm
2
)
0,37 4
0,55 4
0,75 4
1,10 4
1,50 4
2,20 4
3 4
3,7 4
4 4
5,5 4
7,5 4
Over current
protection
Prevents operation under
conditions where motor cur-
rent may exceed safe levels
due to bound pump or other
fault condition. Detection is
based on current heating
capacity measurement to
prevent unnecessary nui-
sance tripping.
Rapid Cycle Pro-
tection
Prevents system dama-
ge due to factors such as
continuous rapid cycling and
excessive motor thermal cy-
cling caused by waterlogged
tank or faulty pressure
switch.
Indicators
Status
Indication shows normal ope-
ration or other condition.
Fault conditions
Dry-run, Over Current, Rapid
Cycling, Over Voltage and
Under Voltage are indicated.
Notes:
1. Can be used with 380V - 415V motors.
2. Type indicates motor power rating and motor
type.
3. Nominal supply current at nominal voltage.
4. Motor starting current under nominal conditions.
5. Use external junction box for drop cable sizes
larger than 4mm
2
Speci¿cations continued
Protection
Dry-run pro-
tection with
auto-reset
Shut-off on detection of underload
with auto-reset in max. 70 minutes
depending on conditions. Manual
reset possible by reapplying power.
Over & Un-
der voltage
protection
with auto-
reset
Due to its unique concept, the Sub-
Tronic3P
®
is capable of extending the
permissible voltage operation range
of the borehole pump, maximizing
water delivery under weak power
supply conditions. Auto-reset in ap-
proximately 3 minutes. Manual reset
possible by reapplying power.
Starting voltage range: 340-480Vac
Operating voltage range: 320-460Vac
Over current
protection
with auto-
reset
Shut-off in 4 seconds at 150% of
nominal current with sliding scale to
120%. Auto-reset in 15 minutes. Ma-
nual reset possible in approximately
5 minutes by reapplying power.
Rapid Cycle
protection
with auto-
reset
Shut-off under persistent rapid
cycling conditions. Auto-reset in 5
minutes if condition clears. Manual
reset possible in approximately 5
minutes by reapplying power.
Intelligent Management features
Dry-run
detection
(without
probes)
Prevents motor and pump damage
due to running the pump without
water based on a reliable proprietary
detection method.
Dry-run auto-
reset
$XWRPDWLFGU\UXQUHVHWWLPHWR¿QG
the best operating point for weak
wells. Reset time varies between 5 to
60 minutes to ensure maximum water
delivery from a weak well. See also:
„Underload Smart Reset“ page 4
Over & Un-
der voltage
Prevents motor damage that may
be caused by abnormal voltage
conditions without limiting the range
of operation - made possible by mat-
ching the design of the SubTronic3P
®
Protector with the Franklin Electric
motor.
GB 3
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