PILZ has released the PITestop range of emergency stop pushbuttons. A safety contact block prevents contact elements being released without detection.
The pushbuttons come in a number of different types. A black ring at the base of the actuator makes it easy to detect when it is has been operated, even from a distance. The PITestop is also available with illumination and with a black actuator to initiate a stop for planned shutdowns.
The safety contact block ensures the emergency stop is triggered immediately if individual contact elements within the emergency stop are lost or are attached incorrectly. Currents as low as 1mA in the safety circuit can be controlled. The safety contact blocks have either one or two N/C contacts plus an additional N/O contact for use as an identification channel. Alternatively, signal contacts are available via the PSEN ix1 interface, which can be used to connect up to four emergency stop buttons in series.
The mushroom-type pushbuttons are designed to IP65 and are turn to release devices, in either a clockwise or anti-clockwise direction. A key-release version is also available. The pushbuttons are suitable for applications up to Category 4 in accordance with EN 954-1. They also meet the new requirements of IEC/EN 60947-5-5 and ISO/IEC 13850 (EN 418).