The IR145Y‑4 is an insulation monitoring device designed for unearthed systems (IT systems). It continuously monitors the insulation resistance of AC/DC 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 suitable for both AC and DC unearthed systems.
Technical Specifications
· Rated system voltage (Uₙ): AC/DC 0…300 V, 15…400 Hz
· Response value (Rₐₙ): 10…200 kΩ (adjustable)
· Response time (tₐₙ): ≤ 5 s (at R_F = 0.5 × Rₐₙ, Cₑ = 1 μF)
· Max. permissible system leakage capacitance (Cₑ): ≤ 20 μF
· Measuring voltage (Uₘ): ≤ 15 V
· Max. measuring current (Iₘ): ≤ 0.11 mA
· Internal DC resistance (Rᵢ): ≥ 120 kΩ / 115 kΩ
· Supply voltage (Uₛ): 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
· Order number: B 9103 6502
Key Features
· Insulation monitoring: Continuously monitors the insulation resistance of the IT system to earth; adjustable response value from 10 kΩ to 200 kΩ.
· Two independent alarm stages: Two separate alarm relays for pre‑warning and main alarm, enabling staged alarming.
· LED status indication: Front‑panel LEDs (Power On, AC, DC+, DC‑) clearly indicate device status and the faulty side (AC or DC).
· Connection monitoring: LED flashes when the measuring leads (L1/L2) or earth connection (KE/E) is interrupted.
· Fault memory: Selectable latching function via DIP switch; alarm status remains until manually reset.
· Self‑test and reset: Combined TEST/RESET button on front panel (short press < 1 s = reset, long press > 2 s = test); supports external test/reset push‑buttons.
· Relay configuration: Alarm relay operating principle (N/O or N/C) selectable via DIP switch.
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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