PS11 is a special purpose relay manufactured by Relpol. This relay is used to control the operation of air-conditioning systems, ventilation systems, fire alarm systems, and other specialty applications. It features multiple inputs, which include several changeover contacts, normally open contacts, normally closed contacts, and single contacts. It also comes with a wide array of output types which enables it to be configured for use in a variety of systems. PS11 is designed for high performance and reliability, making it ideal for commercial and industrial applications.