The IR145Y‑3 is an insulation monitoring device designed for unearthed systems (IT systems). It continuously monitors the insulation resistance of AC/DC main circuits up to 138 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 suitable for both AC and DC unearthed systems.
Technical Specifications
· Response value: 1…20 kΩ (adjustable)
· Rated system voltage: AC/DC 0…138 V, 15…400 Hz
· Supply voltage: AC 230 V, 50…400 Hz
· Power consumption: 3.0 VA
· Alarm output: Two independent changeover contacts, AC 250 V / 5 A
· Data sheet: 103001
· Weight: approx. 280 g
Key Features
· Insulation monitoring: Continuously monitors the insulation resistance of the IT system to earth; adjustable response value from 1 kΩ to 20 kΩ.
· Two independent alarm stages: Two separate alarm relays for pre‑warning and main alarm, enabling staged alarming.
· LED status indication: Front‑panel LEDs clearly indicate device operating status and alarm condition.
· Connection monitoring: Continuously monitors the measuring leads and earth connection to ensure measuring circuit integrity.
· Self‑test and reset: Supports local manual testing and reset for easy on‑site maintenance.
Typical Applications
· Industrial IT systems (AC/DC unearthed systems)
· Online insulation monitoring of mobile generators
· Unearthed control circuits in control cabinets and machinery
· Lighting systems, building electrical installations
· DC distribution systems
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