The IR470LY-40 is an insulation monitoring device from Bender, part of the A-ISOMETER® series, designed for unearthed systems (IT systems). It continuously monitors the insulation resistance of AC or three-phase AC systems (IT systems) with a rated system voltage range of AC/3(N)AC 0…793 V . In combination with AGH series coupling devices, the nominal voltage can be extended to higher levels . An external supply voltage allows de‑energised systems to be monitored as well . The device complies with IEC 61557‑8 .
The systems to be monitored should not contain DC components . The set response values apply to the pure AC system only .
Technical Specifications
· Rated system voltage (Uₙ): AC/3(N)AC 0…793 V, 50…400 Hz
· Supply voltage (Uₛ): AC 230 V, 50…400 Hz
· Response value range (Rₐₙ): 1…200 kΩ (adjustable)
· Power consumption: ≤ 3.0 VA
· Measuring voltage (Uₘ): ≤ 40 V
· Max. measuring current (Iₘ): ≤ 200 μA
· Max. permissible system leakage capacitance (Cₑ): ≤ 20 μF
· Alarm output: Two independent changeover contacts, AC 250 V / 5 A
· Analog output: 0…400 μA (for external measuring instrument)
· Protection class: Internal components IP30, terminals IP20
· Mounting: 35 mm DIN rail or screw mounting
· Operating temperature: –10 °C … +55 °C
· Storage temperature: –40 °C … +70 °C
· Weight: ≤ 360 g
· Standards compliance: IEC 61557‑8, DIN EN 61557‑8
· Order number: B91048007
Key Features
· Insulation monitoring: Continuously monitors the insulation resistance of unearthed AC and three‑phase AC systems (IT systems)
· Adjustable response value: Response value adjustable from 1…200 kΩ to meet different system safety requirements
· LED bar graph indicator: Provides visual indication of the current insulation level
· Alarm LED indication: Different alarm LEDs (AC, DC+, DC‑) distinguish between insulation faults on the AC and DC side
· Connection monitoring: Continuously monitors the measuring leads and earth connection; alarm LED flashes on interruption
· Fault memory: Selectable fault storage; alarm status remains until manually reset
· Self‑test and reset: Built‑in TEST/RESET combination button; supports external push‑buttons for remote operation
· External measuring instrument interface: Provides 0…400 μA analog output for connection to external kΩ meters
· Operating mode: Alarm relay configurable for N/O or N/C operation
· Voltage extension: In combination with AGH series coupling devices, the nominal system voltage can be extended to higher levels
Typical Applications
· Pure AC unearthed systems (IT systems): Suitable for AC systems without significant DC components (frequency converters, rectifiers), such as motors, pumps, fans, air conditioning systems, lighting systems, heating systems
· Mobile generators: Online insulation monitoring of portable and stationary generators
· Industrial plants: Control circuits, motor control centres
· Medical locations: Insulation monitoring of IT systems (isolated power systems) in operating theatres, ICUs, etc.
· Building services: Electrical installations according to DIN VDE 0100‑725
· Infrastructure: Tunnel lighting, railway signalling systems, emergency power supplies
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