Banner Engineering SI-LM40PBF Safety Limit Switch Actuator Plunger

The Banner Engineering SI-LM40PBF Safety Limit Switch Actuator Plunger is a metal-plunger actuator intended for use with the SI-LM40 safety limit switches. It provides a plunger actuation control with a 2 NC/1 NO contact configuration, housed in a compact aluminum die-cast enclosure measuring 108 x 40 x 42 mm. The unit carries an IP65 rating for dust and water protection, operates over a wide -30 to 80°C range, and uses a wiring chamber for field connections. The primary housing material is aluminum die-cast, and the device features Cat 4 safety category and a SIL CL 3 safety rating, aligning with safety system requirements when properly interfaced with a compatible controller. Mechanical life is specified at 1 million operations, reflecting suitability for recurring actuation in industrial environments. Banner lists this model as obsolete, and advises contacting Banner for information about a suitable replacement. As part of the SI-LM40 series, the SI-LM40PBF is designed for interlocking and position-monitoring tasks such as guarding doors or guards on machinery, where a compact, integrated switch-and-actuator assembly helps simplify installation and wiring while supporting standard safety interlock architectures.