Wiring - PENN Controls - LIT-12013066 - PCxxx - PMxxx - PRxxx - PSxxx - Electromechanical Pressure Control - P‐Series Encapsulated Pressure Switch

P-Series Encapsulated Pressure Controls Product Bulletin

Product name
P‐Series Encapsulated Pressure Switch
Document type
Product Bulletin
Document number
Revision date

The P-Series control is available with several switch options and electrical ratings. Check the label on the control body for the model number, and see Table 1 for the standard duty electrical contact rating for your model. Refer to the following warnings and diagrams when you wire a P-Series control.

  • Risk of Electric Shock
  • Disconnect or isolate all power supplies before making electrical connections. More than one disconnection or isolation may be required to completely de-energize equipment. Contact with components carrying hazardous voltage can cause electric shock and may result in severe personal injury or death.
  • Risque de décharge électrique.
  • Débrancher ou isoler toute alimentation avant de réaliser un branchement électrique. Plusieurs isolations et débranchements sont peut-être nécessaires pour -couper entièrement l'alimentation de l'équipement. Tout contact avec des composants conducteurs de tensions dangereuses risque d'entraîner une décharge électrique et de provoquer des blessures graves, voire mortelles.
Important: Make all wiring connections in accordance with the National Electrical Code (NEC) and all local regulations. Use copper conductors only. Do not exceed the P-Series control’s electrical rating.

The following figure shows the P-Series control's open-low switch action that occurs during a pressure drop, and the open-high switch action that occurs during a pressure rise.

Figure 1. Open-low and open-high switch action

The following figure shows the SPDT switch position at low pressure. Open C to B, and close C to A on rise. The 1/4 in. male spade terminal locations A, B, and C are also shown.

Figure 2. P-Series control models with a SPDT switch

Table 1. P-Series control models with a SPDT switch
Callout Description

Normally open (N.O.)


Normally closed (N.C.)


Common (C)

Important: When you mount and wire the P-Series control, attach a reliable set of gauges to the controlled equipment and operate the equipment for at least three cycles at the pressures necessary to verify control setpoints and proper operation. Do not exceed the manufacturer’s recommended pressure ratings for the controlled equipment or any of its components when you operate the controlled equipment.