The Bender ISOMETER® IR 140Y-4 is a robust insulation monitoring device designed for unearthed AC and DC control circuits (IT systems). It continuously monitors the insulation resistance of a system to earth, providing early detection of insulation faults. This compact unit is ideal for applications such as mobile power generators, control panels, and machinery where operational reliability and electrical safety are critical. It features two separate alarm relays with adjustable response values, allowing for pre-warning and main alarm configurations. The current insulation value is indicated by an LED, ensuring straightforward status monitoring at a glance.