A submersible sewage pump with a macerator—highly efficient and clog-resistant—designed for commercial and municipal applications to ensure reliable pressure drainage.

The Wilo-Rexa PRO-S submersible sewage pump features a macerator and is suitable for commercial and municipal applications in compliance with EN 12050-1, delivering reliable pressure drainage. Equipped with a high-efficiency radial macerator that provides a dual-cutting effect, it ensures reliable and cost-effective continuous operation. Its high-head capability guarantees effective pressure drainage even in installations with high static heads. Installation costs are effectively reduced through the use of smaller-diameter piping. The robust grey cast iron motor is designed for continuous operation and ease of maintenance. High-quality sealing—featuring dual mechanical seals and an optional seal chamber monitoring function—ensures a long service life. The motor comes with standard ATEX certification, allowing for use in Category 2 and Category 1 explosion-hazardous areas.

Features/Product Advantages

Radial macerator with dual-cutting effect ensures excellent clog resistance
Optimized hydraulics and macerator combination deliver high head and outstanding efficiency
Lower overall installation costs due to the use of smaller-diameter piping
Rugged design capable of meeting demanding requirements
High-quality motor with dual mechanical seals and optional seal chamber monitoring ensures a long service life
Superior design facilitates professional maintenance, resulting in a long product lifespan and high operational stability

Construction

Fully submersible macerator pump designed for stationary and portable wet-well installation in continuous operation mode.

Fluids

Pumping in commercial environments:

Sewage containing faeces
Wastewater (containing small amounts of sand)

Sewage pumping in accordance with the 12050 standard

The pump complies with the requirements of DIN EN 12050-1.

Equipment/Functions

Radial cutter with dual shearing effect
ATEX certification
Motor overheating protection with bimetallic strip
Internal motor humidity monitoring
Connection cable with bare cable ends
Single-phase AC motor with separate capacitor box

Model code

Technical data

Power connection: 1~230 V, 50 Hz or 3~400 V, 50 Hz
Submerged operation mode:
Rexa PRO-S03: S1
Rexa PRO-S04: S1
Non-submerged operation mode:
Rexa PRO-S03 (4 kW and below): S2-30 min; S3 25%
Rexa PRO-S03 (5 kW and above): S2-30 min; S3 10%
Rexa PRO-S04: Motor suitable for non-submerged operation. Maximum operating time determined by motor temperature. To this end, the motor is equipped with a temperature monitoring device at the factory.
Protection class: IP68
Insulation class: F
Fluid temperature: 3 ... 40 °C (37 ... 104 °F)
Max. fluid temperature: 60 °C (140 °F) for 3 minutes

Materials

Pump housing: EN-GJL-250 (ASTM A48 Class 35/40B)
Impeller: EN-GJL-250 (ASTM A48 Class 35/40B)
Macerator: 1.4528/59 HRC (AISI 440B+Co)
Motor housing: EN-GJL-250 (ASTM A48 Class 35/40B)
Shaft:
Up to 2.5 kW: 1.4401 (AISI 316)
From 3.9 kW: 1.4021 (AISI 420)
Motor-side seal: C/MgSiO
Fluid-side seal: SiC/SiC
Static seals: NBR (Nitrile rubber)

Type

Rexa PRO-S03 .../M .../O

Sewage pump equipped with a radial macerator featuring a dual-cutting effect. Horizontal discharge port with flange and oval connection. Hydraulic housing and impeller made of grey cast iron; macerator made of hardened blade steel. Surface-cooled 1~ motor equipped with motor thermal protection and moisture electrode. Oil-filled sealing chamber with two mechanical seals. Motor housing made of grey cast iron. Detachable connection cable with capacitor box and bare cable ends. Explosion-proof version supplied as standard.

Rexa PRO-S03 .../T .../O

Sewage pump equipped with a radial cutter featuring a dual-cutting action. Horizontal discharge port with flange and oval connections. Hydraulic housing and impeller made of grey cast iron; cutter made of hardened blade steel. Surface-cooled 3-phase motor equipped with motor overheating protection and moisture electrodes. Oil-filled sealing chamber with two mechanical seals. Motor housing made of grey cast iron. Detachable power cable with bare cable ends. Explosion-proof version as standard.

Rexa PRO-S04 .../T .../O

Two-stage sewage pump equipped with a radial cutter featuring a dual-cutting action. Horizontal discharge connection via flange. Hydraulic housing and impeller made of grey cast iron; cutter made of hardened blade steel. Surface-cooled three-phase AC motor equipped with motor overheating protection (dual temperature monitoring). Oil-filled sealing chamber with two mechanical seals. Motor housing made of grey cast iron. Power cable with bare ends. Explosion-proof version as standard.

Scope of delivery

Pump
Installation and operating instructions

Options

Motor temperature monitoring with PTC sensors
Motor winding insulation class "H"
FKM (FPM) static gaskets
Special voltage

Accessories

Power cable; fixed cable lengths up to a maximum of 50 m (164 ft).
External rod electrode for sealing chamber monitoring
Suspension device for wet-well installation
Pump foot for portable installation
Level control devices
Fastening kit with anchor bolts
Mounting accessories and chains
Switchgear, relays, and plugs