The IR140Y‑4 is an insulation monitoring device designed for unearthed systems (IT systems). It continuously monitors the insulation resistance of AC main circuits up to 300 V. When the insulation value falls below a preset threshold, the device triggers an alarm, allowing the first earth fault to be detected before a second fault causes a power outage or equipment damage. The device complies with IEC 61557‑8 and is compact, making it particularly suitable for pure AC IT systems.
Technical Specifications
· Rated system voltage (Uₙ): AC 0…300 V, 50…400 Hz
· Response value (Rₐₙ): 10…200 kΩ (adjustable)
· Supply voltage (Uₛ): AC 230 V, 50…400 Hz
· Power consumption: 3.0 VA
· Alarm output: Two independent changeover contacts (Alarm 1 / Alarm 2), AC 250 V / 5 A
· Indicators: LED alarm indicators (AC, DC+, DC‑) to distinguish the faulty side
· Data sheet: 101001
· Weight: approx. 280 g
Key Features
· Insulation monitoring – Uses the AMP measuring principle (superimposed pulsating measuring voltage) to continuously monitor the insulation resistance of the IT system to earth.
· Two independent alarm stages – Two separately adjustable alarm relays, response range 10…200 kΩ, allowing pre‑warning and main alarm settings.
· Fault memory – Selectable fault memory; alarm status remains until manually reset, helping to capture intermittent faults.
· Connection monitoring – Continuously monitors the measuring leads and earth connection; alarm LED indicates interruption.
· Self‑test and reset – Built‑in TEST/RESET button on the front panel; supports external push‑buttons for remote operation.
· LED status indication – Three LEDs (AC, DC+, DC‑) clearly indicate the faulty side (AC or DC), providing immediate visual feedback.
Typical Applications
· Industrial IT systems (pure AC unearthed systems)
· Online insulation monitoring of mobile generators
· Unearthed control circuits in control cabinets and machinery
· Lighting systems, building electrical installations
· Medical locations (isolated power systems in operating theatres, ICUs)
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