Franklin Electric · Submersible Non-Clog Solids Handling Pump
FPS 4NC Series
3 and 5 HP submersible non-clog pump for raw sewage and effluent: 4 in ANSI Class 125 flanged discharge, 3 in spherical solids, single- and three-phase builds.
3 and 5 HP
545 GPM Max Flow
49 ft Max Head
4 in ANSI 125 Flange
3 in Solids
1750 RPM
1Ph and 3Ph
cCSAus
260-265 lb Weight
Overview
The FPS 4NC Series is a submersible solids handling (non-clog) pump for raw, unscreened domestic sewage, effluent, irrigation and general dewatering in commercial and industrial service. Franklin Electric builds it with a semi-open ductile iron impeller, a field-adjustable wear plate and dual silicon carbide mechanical seals with a seal-fail probe.
Motor: Oil-filled, Class F insulation. Available in 230V single-phase and 200/230V, 460V and 575V three-phase. Performance is set by the impeller trim: 3 HP: 146, 160 and 170 mm. 5 HP 1Ph: 170 and 176 mm. 5 HP 3Ph: 170 and 182 mm. Standard trim: 3 HP 170 mm; 5 HP 1Ph 176 mm; 5 HP 3Ph 182 mm.
Pick the trim from the duty point, not the horsepower. Two pumps of the same HP deliver very different flows at the same head depending on the trim fitted, so size from the performance table below and confirm with a factory curve before ordering.
Genuine Franklin Electric equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
Warranty: 2 years from the date of original purchase by the consumer. Franklin Electric: single-phase motors require an FPS control panel or starter kit for proper operation and warranty. Source: NC Series owner manual 10000017761 and FPS Wastewater Catalog M5276.
Growth & Multiplex
Runs as a single pump or as a duplex lift station, with two pumps alternating lead and lag from a duplex control panel. Franklin Electric publishes matching NC Series control panels, and guide-rail base elbows are offered for lift-out installation (see Accessories).
Models & Ratings
| Model |
Part No. |
HP |
Voltage and Phase |
FLA |
Impeller |
Cord |
Weight lb |
| 4NC-323P1-146 |
87110384-01 |
3 |
230V 1Ph |
17.5 |
146 mm |
50 ft |
260 |
| 4NC-323P1-160 |
87110383-01 |
3 |
230V 1Ph |
21.5 |
160 mm |
50 ft |
260 |
| 4NC-323P1-170 |
87110382-01 |
3 |
230V 1Ph |
24 |
170 mm |
50 ft |
260 |
| 4NC-323P3-146 |
87110387-01 |
3 |
200/230V 3Ph |
12/11 |
146 mm |
50 ft |
260 |
| 4NC-323P3-160 |
87110386-01 |
3 |
200/230V 3Ph |
13.5/13 |
160 mm |
50 ft |
260 |
| 4NC-323P3-170 |
87110385-01 |
3 |
200/230V 3Ph |
16/14 |
170 mm |
50 ft |
260 |
| 4NC-346P3-146 |
87110390-01 |
3 |
460V 3Ph |
5.5 |
146 mm |
50 ft |
260 |
| 4NC-346P3-160 |
87110389-01 |
3 |
460V 3Ph |
6.5 |
160 mm |
50 ft |
260 |
| 4NC-346P3-170 |
87110388-01 |
3 |
460V 3Ph |
7 |
170 mm |
50 ft |
260 |
| 4NC-357P3-146 |
87110393-01 |
3 |
575V 3Ph |
4.5 |
146 mm |
50 ft |
260 |
| 4NC-357P3-160 |
87110392-01 |
3 |
575V 3Ph |
5 |
160 mm |
50 ft |
260 |
| 4NC-357P3-160 |
87110392-00 |
3 |
575V 3Ph |
5 |
160 mm |
30 ft |
260* |
| 4NC-357P3-170 |
87110391-01 |
3 |
575V 3Ph |
5.5 |
170 mm |
50 ft |
260 |
| 4NC-357P3-170 |
87110391-00 |
3 |
575V 3Ph |
5.5 |
170 mm |
30 ft |
260* |
| 4NC-523P1-170 |
87110395-01 |
5 |
230V 1Ph |
24 |
170 mm |
50 ft |
260 |
| 4NC-523P1-176 |
87110394-01 |
5 |
230V 1Ph |
30 |
176 mm |
50 ft |
265 |
| 4NC-523P3-170 |
87110399-01 |
5 |
200/230V 3Ph |
16/14 |
170 mm |
50 ft |
260 |
| 4NC-523P3-182 |
87110398-01 |
5 |
200/230V 3Ph |
21/17 |
182 mm |
50 ft |
265 |
| 4NC-546P3-170 |
87110403-01 |
5 |
460V 3Ph |
7 |
170 mm |
50 ft |
260 |
| 4NC-546P3-182 |
87110402-01 |
5 |
460V 3Ph |
9 |
182 mm |
50 ft |
265 |
| 4NC-557P3-170 |
87110407-01 |
5 |
575V 3Ph |
5.5 |
170 mm |
50 ft |
260 |
| 4NC-557P3-182 |
87110406-01 |
5 |
575V 3Ph |
7 |
182 mm |
50 ft |
265 |
Source: Franklin Electric price list 996791 (June 2026) and FPS Wastewater Catalog M5276. FLA = full-load amps; where two figures are shown they are at 200V / 230V. * Weight not listed for this 30 ft cord build; figure is an estimate from the matching 50 ft build.
Specifications
| Specification |
Value |
| Discharge |
4 in horizontal, ANSI Class 125 flange (ASME B16.1) |
| Maximum spherical solids |
3 in |
| Speed |
1750 RPM at 60 Hz |
| Motor |
Oil-filled, Class F insulation |
| Continuous duty |
Up to 104 °F (40 °C) fully submerged |
| Cord |
50 ft standard; 30 ft on the -00 builds listed |
| Agency listing |
cCSAus |
| Dimensions |
Overall height 28.9 in (1Ph) / 27.2 in (3Ph) |
| Bearing life |
B-10 life 30,000 h minimum |
Source: FPS Wastewater Catalog M5276 (09-25), NC Series Brochure M5141 (06-24) and bid specifications.
Performance — Will It Do What You Need?
Find your total dynamic head across the top (static lift plus friction in the force main). The figure is gallons per minute at that head.
| Impeller |
10 ft |
20 ft |
30 ft |
40 ft |
50 ft |
60 ft |
Shut-Off |
| 146 mm (5.74 in) |
300 |
150 |
0 |
- |
- |
- |
30 ft |
| 160 mm (6.29 in) |
380 |
240 |
100 |
- |
- |
- |
36 ft |
| 170 mm (6.69 in) |
455 |
330 |
195 |
34 |
- |
- |
42 ft |
| 176 mm 1Ph / 182 mm 3Ph |
545 |
434 |
309 |
141 |
- |
- |
49 ft |
Manufacturer tabulated points only. Shut-off is the head at zero flow, the ceiling rather than a working point. A dash means no rated flow at that head. Source: FPS Wastewater Catalog M5276 (09-25).
Before You Buy — The Limits That Decide the Fit
| Limit |
Value |
| Solids |
Non-abrasive spherical solids up to 3 in |
| Liquid temperature |
Continuous duty up to 104 °F (40 °C) fully submerged |
| Power |
Single-phase models need an FPS control panel or the 520851 starter kit |
| Seal-fail signal |
The seal-fail probe needs a control panel with seal-fail circuitry |
| Mounting |
Flange carries the pump weight; lift-out rail systems and base elbows sold separately |
| App |
None: the pump runs from its control panel |
Materials of Construction
| Component |
Material |
| Motor housing |
Gray cast iron, ASTM A48 Class 25 equivalent, epoxy-coated |
| Impeller |
Ductile iron, ASTM A536 80-55-06 equivalent; single vane, semi-open, balanced |
| Shaft |
AISI 420 stainless steel |
| Mechanical seals |
Tandem silicon carbide / silicon carbide, upper and lower, in oil bath; 300 series SST hardware; NBR elastomers |
| Seal-fail sensor |
Single probe in the seal-fail chamber |
| Bearings |
Single-row upper and double-row lower ball bearings |
| Power cable |
4-conductor Type SOOW or SEOOW, 600 V |
Source: Franklin Electric bid specifications 10000020402 (NC) and 10000018876 (4NCH), 09/24.
Accessories
| Accessory |
Order No. |
| 4.00 in Base Elbow (FPSBEA400) |
115930104 |
| 4 in Lift-Out Flange, 3 and 4 in ANSI Double Tapped (FPSPF400) |
115930128 |
| 4 in Lift-Out Kit, Hardware and Gasket (FPSPK400) |
115930131 |
| NC Single-Phase Starter Kit (NC-CK) |
520851 |
Service Parts
| Part |
Order No. |
Fits |
| Single-Phase Starter Kit (NC-CK), 230V |
520851 |
3NC and 4NC 1Ph |
| Cover Assembly, 30 ft Cord |
8730524102A |
3NC and 4NC |
| Cover Assembly, 50 ft Cord |
8730524104A |
3NC and 4NC |
| Mechanical Seal |
8720375102A |
3NC and 4NC |
| Exclusion Seal |
8720354101A |
3NC and 4NC |
| Motor Housing, 1Ph |
8700217502A |
3NC and 4NC 1Ph, 3 and 5 HP |
| Rotor, 3Ph |
8720365101A |
3NC and 4NC 3Ph, 3 and 5 HP |
| Stator Kit, 200/230V and 460V |
8720362103A |
3NC and 4NC 3Ph, 3 and 5 HP |
| Stator Kit, 575V |
8720362102A |
3NC and 4NC 3Ph, 3 and 5 HP |
| Volute, 4 in Discharge |
8700219502A |
4NC |
| Wear Plate, 4 in |
8700228502A |
4NC |
| Wear Plate Adjustment Kit |
8730531101A |
3NC and 4NC |
| 4NC Impeller, 182 mm |
8701540403A |
4NC 5 HP 3Ph |
| 4NC Impeller, 176 mm |
8701540404A |
4NC 5 HP 1Ph |
| 4NC Impeller, 170 mm |
8701540405A |
4NC 3 and 5 HP |
| 4NC Impeller, 160 mm |
8701540406A |
4NC 3 HP |
| 4NC Impeller, 146 mm |
8701540407A |
4NC 3 HP |
| Impeller Bolt Kit |
8730530101A |
3NC and 4NC |
| Upper Bearing |
8720160114A |
3NC and 4NC |
| Lower Bearing |
8720374101A |
3NC and 4NC |
| Bearing Carrier |
8700222151A |
3NC and 4NC |
| Bearing Cover |
8720377101A |
3NC and 4NC |
| Lower Bearing Plate |
8730532102A |
3NC and 4NC |
| Lower Bearing Plate Bolt Kit |
8730526102A |
3NC and 4NC |
| Seal Fail Cover |
8700225151A |
3NC and 4NC |
| Seal Fail Sensor Kit |
8730528101A |
3NC and 4NC |
| Seal Fail Bolt Kit |
8720370101A |
3NC and 4NC |
| Hardware Connector Kit |
8730525101A |
3NC and 4NC |
| Splicing Connector Kit |
8730533101A |
3NC and 4NC |
| Cover Bolt and Washer Kit |
8730549101A |
3NC and 4NC |
| Oil Plug |
8720038101A |
3NC and 4NC |
| O-Ring 132.94 x 3.53 mm |
8752138101A |
3NC and 4NC |
| O-Ring 209.14 x 3.53 mm |
8752138102A |
3NC and 4NC |
| O-Ring 120.24 x 3.53 mm |
8720114127A |
3NC and 4NC |
| O-Ring 222 x 3.53 mm |
8720114123A |
3NC and 4NC |
All listed on our Franklin Electric NC Series repair parts listing. Source: FPS Wastewater Catalog M5276 (09-25), NC model parts.
