Logotype Gsp Project

You are here

Series Muffin Monster 40002

Sulzer Grinder - 40002 Muffin Monster® - Open Channel 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.


  • Open channel configuration
  • Grinder cutter stack heights from 450 mm to 800 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 working pressure
  • Available with channel or wall mounted frame for easy installation


  • Flow rates up to 447 m3/hr


  • Pump stations
  • Collection systems
  • Headworks at wastewater treatment
  • 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 standard
  • Optional explosion proof and immersible motors available
  • 35:1 reducer, cycloidal design

Muffin Monster controller

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

Muffin Monster frame options

  • Adapt grinders for easy installations
  • Channel frames to fit most channel types
  • Wall frames to mount on flat or round walls
  • Type 304 or 316 stainless steel construction
  • Guide rails for easy installation and maintenance

Performance curves

Muffin Monster grinder cutters

Tooth count Thickness Material
11-tooth 8 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


Open channel model

Flow rate1 , m3/h

Head drop, mm

A (IP55)

A (IP68)



Approximate net weight- kg

40002-0018 207 203 1704 1816 457 768 533
40002-0024 327 406 1882 1994 610 946 619
40002-0032 477 457 2050 2162 813 1114 708

1 Flow based on optimum channel conditions. Consult factory for analysis of application.
2 Drive dimensions are a maximum based on a unit with a 2.2 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)     2                      
  Monster Renew unit     E                      
  Monster Renew unit with spool     F                      
Stack height
450 mm (18 inch)       L  
  600 mm (24 inch)       M                    
  800 mm (32 inch)       N                    
Flange type
Not applicable          X X                
Cutter material Alloy steel             1  
Cutter 11-tooth, 11 mm thick               F 4          
Body material & colour Cast iron blue                   S        
Seals & gaskets material Svere duty seals & Viton gaskets                     V      
Drum information Not applicable                        X X  
Drive configuration Single drive                           S
Example 40002-0032 Q 4 2 N X X 1 F 2 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 de IIC T4) QF2435B2R
7,5 kW Immersible 400V, 3-phase, 50 Hz IP68 for ATEX (Ex d 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