The IR125Y‑4 is a compact insulation monitoring device designed for unearthed systems (IT systems). It continuously monitors the insulation resistance of AC and DC control circuits. The device is powered directly from the monitored system without the need for an external auxiliary supply. It uses the active AMP measuring principle, which reliably detects both asymmetrical and symmetrical insulation faults, providing comprehensive protection.
Technical Specifications
· Rated system voltage (Uₙ): AC 19.2…265 V; DC 19.2…308 V
· Response value (Rₐₙ): 10…200 kΩ (adjustable)
· Response time (tₐₙ): ≤ 6 s
· Max. permissible system leakage capacitance (Cₑ): ≤ 10 μF
· Measuring voltage (Uₘ): ≤ 13 V
· Max. measuring current (Iₘ): ≤ 0.12 mA
· Internal DC resistance (Rᵢ): 112 kΩ
· Power consumption: ≤ 1.5 VA
· Alarm output: 1 potential‑free changeover contact (SPDT), AC 250 V / 5 A
· Operating principle: N.C. operation (Ruhestrom)
· LED indicators: Power On LED, Alarm LED (lights on insulation fault)
· Test/Reset: Built‑in combined TEST/RESET button; supports external reset push‑button
· Fault memory: Selectable fault storage function
· Protection class: Internal components IP30, terminals IP20
· Mounting: 35 mm DIN rail (IEC 60715) or screw fixing with mounting plate (B 990 056)
· Enclosure type: XM22, width 22.5 mm (ultra‑compact)
· Weight: approx. 130 g
· Operating temperature: –10 °C … +55 °C
· Storage temperature: –40 °C … +70 °C
· Climate class: 3K5 (IEC 60721‑3‑3)
· Standards compliance: IEC 61557‑8, DIN EN 61557‑8
· Data sheet: D00114
· Order number: B91023005
Key Features
· Active AMP measuring principle: Actively measures and detects both asymmetrical and symmetrical insulation faults.
· Self‑powered: Powered directly from the monitored system, no external supply needed.
· Adjustable alarm threshold: Response value adjustable from 10 kΩ to 200 kΩ; selectable fault memory.
· Easy installation and maintenance: DIN rail mounting; integrated TEST/RESET button.
· Clear status indication: Power On and Alarm LEDs for immediate visual feedback.
· Ultra‑compact design: Only 22.5 mm wide, saving space in control cabinets.
Typical Applications
· Industrial machinery: Insulation monitoring of AC/DC control and auxiliary circuits compliant with DIN EN 60204‑1 / IEC 60204‑1.
· DC auxiliary circuits: Compliant with DIN VDE 0100‑725.
· Simple battery systems: Insulation monitoring for battery‑powered unearthed systems.
· Lighting systems: Insulation monitoring for unearthed lighting circuits.
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