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Series Muffin Monster 40002

Sulzer Grinder - 40002 Muffin Monster® - Inline series

The 40002 Muffin Monster excels in wet and dry grinding applications. It protects pumps and other sensitive equipment by grinding down the toughest wastewater solids. Its powerful, dual-shafted, slow speed, high-torque design shreds the toughest solids.


  • Inline pipe configuration
  • Pipe flange diameters from 300 mm to 500 mm
  • Hardened alloy steel cutters (standard), 190 mm diameter
  • Ductile iron housings
  • Hardened alloy steel shafts, 64 mm hex
  • Mechanical seals with tungsten carbide faces, 10.3 bar maximum dry working pressure


  • Flow rates up to 1558 m3/hr


  • Large sludge lines
  • Pump stations
  • Private facility discharge to municipal sewer system
  • Prison sewage system protection
  • Industrial wet waste grinding and maceration

Monster Renew grinder

In place of repairing a worn grinder, choose a Monster Renew unit. Sulzer provides a new, factory-built grinder cartridge to replace the worn grinder cartridge. Remove the motor and reducer from the worn unit, install the motor and reducer on the Monster Renew unit, and install the new assembly in place of the worn unit.

Benefits include:

  • Minimizes operational downtime
  • Quick turnaround
  • All new parts
  • Great time to upgrade unit
  • Full factory warranty on the Monster Renew grinder cartridge

Muffin Monster motor assembly

  • 7.5 kW power
  • Optional explosion proof and immersible motors available
  • 25:1 reducer, cycloidal design

Muffin Monster controller

  • Ensures maximum grinding ability with minimum stoppage
  • Designed and programmed for specified motor

Performance curves


Muffin Monster grinder cutters

Tooth count Thickness Material
11-tooth 11 mm Hardened alloy steel

Muffin Monster grinder materials

Part Material
Housings Ductile Iron
Cutters Hardened alloy steel
Shafts Hardened alloy steel
Mechanical seals Tungsten carbide faces
Gaskets Viton

Dimensions (mm)



Standart dimensions2, mm

Flange dimensions, mm  

Inline model

Flow rate1 , m3/h

Head drop, mm

Pressure drop, bar

A (IP55)

A (IP68)






Approximate net weight1- kg

40002-18B300 612 300 0.24 1704 1848 895 768 410 28 (M24) 12 690
40002-24B400 999 400 0.15 1882 2027 1099 946 525 31 (M27) 16 860
40002-24B450 1249 450 0.23 1882 2027 1200 946 585 28 (M24) 20 950
40002-32B500 1558 500 0.29 2080 2117 1301 1092 650 32 (M30) 20 1184

1 In-Line unit typically installed prior to suction side of pump. Consult factory for analysis of application.
2 Drive dimensions are a maximum based on a unit with a 4.0 kW drive.

40002 Muffin Monster grinder model coding

Product family
Solids reduction sewage grinder Q                          
Grinder family 40K Muffin Monster   4                        
Grinder configuration New unit with motor (specified separately)     1                      
  Monster Renew unit     A                      
  Monster Renew unit with spool     B                      
Cutter stack height and flange diameter
450 mm stack 300 mm flange       L  5
  600 mm stack 400 mm flange       M  6                  
  600 mm stack 450 mm flange       M 7
  800 mm stack 500 mm flange       N 8
Flange type
BS EN 1092, PN16           D                
Cutter material Alloy steel            
Cutter 11-tooth, 11 mm thick              
F 4          
Body material & colour Cast iron blue                  
Seals & gaskets material Severe duty seals & Viton gaskets                     V      
Drum information Not applicable                       X X  
Drive configuration Single drive                           S
Example 40002-24B400 with 11-tooth cutter Q 4 1 M 6 D 1 F 4 S V X X S

Muffin Monster motor assembly

Power Voltage Protection type Motor model code
7,5 kW TEFC 400V, 3-phase, 50 Hz IP55 QF1435B2R
7,5 kW TEFC 400V, 3-phase, 50 Hz IP55 for ATEX (Ex d IIC T4) QF2435B2R
7,5 kW Immersible 400V, 3-phase, 50 Hz IP68 for ATEX (Ex de IIB T4) QF3435B1R

Muffin Monster controller

Grinder motor type Model code for IP65 control panel enclosure  
  Powder coated mild steel material Stainless steel material
7.5 kW IP55 QN1P45XXX QN1S45XXX
7.5 kW IP68 QN2P45XXX QN2S45XXX