The high reliability of an IT system is guaranteed thanks to continuous insulation monitoring. An insulation monitoring device recognizes insulation faults as they develop, and immediately reports that the value has fallen below the minimum. This prevents operational interruption caused by a second, more severe insulation fault.
Characteristics of CM-IWN insulation monitors - isolation monitors
· Monitoring of electrically isolated AC mains or electrically isolated DC mains
· 1 c/o (SPDT) contact
· Wide- or single-supply voltage range
· Selectable open- (normally de-energized) or closed-circuit (normally energized) principle *
· Adjustment of threshold values (trip points) via direct reading scales
· Setting and operation via front-face operating controls
· LEDs for status indication
· 45 mm wide enclosure
· Integrated and snap-fitted front-face marker
· Sealable transparent cover (accessory)
· Adapter for screw mounting (accessory)
Characteristics of C558 insulation monitors
· Monitoring of electrically isolated AC mains, AC mains with DC components or AC and DC mains
· For mains with up to 690 V AC or 400 V DC
· 2 c/o (SPDT) contacts or 2 x 1 c/o (SPDT) contact
· Single-supply voltage range
· Selectable open- (normally de-energized) or closed-circuit (normally energized) principle
· Fault storage selectable
· Setting and operation via front-face operating controls
· LEDs for status indication
· 45 mm or 99 mm wide enclosure
· 99 mm wide units fit in panel distribution boards
· External kOhm meter available (accessory)
Examples of application
· Monitoring of electrically isolated supply mains for insulation resistance failure
· Detection of initial faults
· Protection against ground faults