SJE-Rhombus International Product Details

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SJE AmpMaster®

Mechanically-Activated, Wide-Angle Pump Switch

Pump switches provide automatic pump control.

The 20 amp rated SJE AmpMaster® pump switch is designed to directly control grinder and high head sewage pumps up to 1 1/2 HP at 125 VAC and 3 HP at 250 VAC in grinder and lift station applications, as well as septic tank effluent pump (STEP) systems.

The SJE AmpMaster® pump switch is not sensitive to rotation or turbulence, allowing it to be used in both calm and turbulent applications.  It is available for pump down applications only.

U.S. Patent No. 5,087,801 and 5,142,108

SJE AmpMaster®

Interruptor de flotador para bombas de 20 amps, de ángulo amplio y activado mecánicamente.

El interruptor para bombas SJE AmpMaster® está diseñado para controlar directa y automáticamente bombas de trituramiento (grinder) y bombas de aguas residuales de hasta 1 1/2 HP a 125VAC y 3 HP a 250VAC en aplicaciones de trituramiento y estaciones de bombeo, así como en sistemas de tanque séptico efluente (STEP).

El SJE PumpMaster® no es sensible a la rotación o turbulencia, lo que permite que pueda ser utilizado tanto en aplicaciones de aguas calmadas y turbulentas. Disponible solo para aplicaciones de vaciado.

Certificado UL, CSA y patentado en EE.UU bajo 5,087,801 y 5,142,108

Cinco años de garantía limitada



SJE AmpMaster®


  • Maximum pump running current of 20 amps
  • Heavy-duty contacts mounted on high-conductivity copper substrates
  • Controls pumps up to 1 1/2 HP at 125 VAC and 3 HP at 250 VAC
  • Second set of non-conductive contacts enhance switch activation
  • For direct wiring in 125 VAC or 250 VAC applications (piggy-back plug model not available)
  • Adjustable pumping range of  23 -61 cm (9 - 24 inches)
  • Includes standard mounting clamp and boxed packaging

SJE AmpMaster® Pump Switch Diagrams


  • In standard cable lengths of 3, 5, 6, or 10 meters (10, 15, 20, or 30 feet) - longer lengths available

UL Recognized, CSA Certified

Five-Year Limited Warranty



SJE AmpMaster®


Flexible 12 gauge, 2 conductor (UL, CSA) SJOW, water-resistant (CPE)

7.75 cm diameter x 9.04 cm long (3.05 inches diameter x  3.56 inches long) high impact, corrosion resistance, PVC housing for use in sewage and water up to 50oC (120oF)

125 VAC 50/50 Hz Single Phase:
Maximum Pump Running Current: 20 amps
Maximum Pump Starting Current: 120
Recommended Pump HP: 1119 W (1 1/2 HP) or less

250 VAC 50/50 Hz Single Phase:
Maximum Pump Running Current: 20 amps
Maximum Pump Starting Current: 120 amps
Recommended Pump HP: 2238 W (3 HP) or less

NOTE: This switch must be used with pumps that provide integral thermal overload protection.  Certain pump applications may require the use of an external capacitor start kit.


Available Downloads

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Visit our downloads section of this website for additional literature.

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