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Control and auxiliary circuits up to 300 V

Control and auxiliary circuits are circuits for additional functions, e. g. command input, interlocking, alarm and measuring circuits.
For these circuits, operating reliability is the most important factor. Control circuits, for example machine control systems or safety lighting, normally are small circuits.

A-ISOMETER® for AC systems up to 300 V

A-ISOMETER® IR420-D4
	The A-ISOMETER® of the IR420 series is designed to monitor the insulation resistance of AC control circuits (IT systems) 0…300 V. If the systems to be monitored include DC components, such as switched-mode power supplies or solenoid valves, the display and operating characteristics may be affected. The display and response values apply to pure AC systems. An external supply voltage allows de-energized systems to be monitored too.
A-ISOMETER® for DC systems up to 230 V
A-ISOMETER® IR125Y-...
	The A-ISOMETERs® of the IR125Y series are designed to monitor the insulation resistance of unearthed DC control circuits (IT systems) DC 19.2…308 V. External supply voltage is not required. In contrast to insulation monitoring device which evaluate the shift voltage for insulation fault detection, this series uses the active AMP measuring principle. This creates the possibility to detect and indicate both symmetrical and asymmetrical insulation faults.
A-ISOMETER® for AC, AC/DC or DC systems up to 300 V
A-ISOMETER® IR425-D4
	The A-ISOMETER® of the IR425 series is designed to monitor the insulation resistance of unearthed AC/DC control circuits (IT systems) 0…300 V. DC components existing in AC/DC systems do not influence the operating characteristics. An external supply voltage allows de-energized systems to be monitored too.