The IR125Y‑2 is a compact insulation monitoring device designed for unearthed systems (IT systems). It continuously monitors the insulation resistance of AC/DC 9.6…100 V 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.
The device is particularly suitable for control voltage networks in automation systems, allowing insulation deterioration to be identified before it reaches a critical level, thus preventing personal injury and production downtime. It complies with DIN EN 61557‑8, IEC 61557‑8, and EN 61557‑8.
Technical Specifications
· Rated system voltage (Uₙ): AC/DC 9.6…100 V, protected against polarity reversal
· Response value (Rₐₙ): 1…20 kΩ (adjustable)
· Response time (tₐₙ): ≤ 6 s (at R_F = 0.5 × Rₐₙ, Cₑ = 1 μF)
· 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 (short press < 1 s = reset, long press > 2 s = test)
· 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
· 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 (no condensation or icing)
· Standards compliance: IEC 61557‑8, DIN EN 61557‑8, EN 61557‑8, ASTM F1669M‑96
· Data sheet: D00114
· Order number: B 9102 3013
Key Features
· Active AMP measuring principle: Detects and indicates both asymmetrical and symmetrical insulation faults, ensuring reliable monitoring of modern DC‑powered control voltage networks (e.g., with switch‑mode power supplies, frequency converters).
· Self‑powered: Powered directly from the monitored system, no external auxiliary supply required.
· Adjustable alarm threshold: Response value adjustable from 1 kΩ to 20 kΩ.
· Fault memory: Selectable latching function; alarm status remains until manually reset.
· Self‑test and reset: Built‑in TEST/RESET button for local testing and reset; supports external reset push‑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
· Modern control voltage networks: Insulation monitoring of AC/DC control circuits, particularly in automation systems.
· Unearthed auxiliary and DC control circuits: Compliant with DIN EN 60204‑1 / IEC 60204‑1 (Electrical equipment of machines).
· Simple battery systems: Insulation monitoring for battery‑powered unearthed systems.
· Lighting systems: Insulation monitoring for unearthed lighting circuits.
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