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3UG4615-1CR20

The Siemens 3UG4615-1CR20 is a high-precision insulation monitoring relay designed for unearthed AC/DC systems (IT systems). It continuously measures insulation resistance to detect ground faults, ensuring operational safety in critical applications such as medical facilities, data centers, and industrial power systems.

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Key Features & Specifications
1. Electrical Parameters
Rated System Voltage (Un): 0–250V AC/DC (IT systems)

Measuring Principle: Pulse measurement (adaptive)

Insulation Resistance Range: 1 kΩ–10 MΩ (adjustable response threshold)

Response Threshold: 10–500 kΩ (configurable)

Supply Voltage: 24–240V AC/DC (universal)

2. Protection & Monitoring Functions
Real-time Insulation Monitoring: Detects symmetrical/asymmetrical ground faults

Adjustable Delay Time: 0–10s (prevents nuisance tripping)

Fault Memory: Stores last fault event (manual reset required)

Self-Test Function: Automatic system integrity check

3. Outputs & Alarms
Relay Outputs:

1x SPDT changeover relay (5A, 250V AC)

1x solid-state relay (SSR) for fast response

LED Indicators:

Power (green)

Fault (red)

Warning (yellow, pre-alarm)

4. Mechanical & Interface
Mounting: DIN Rail (35mm)

Front-Panel Controls:

Test button for manual verification

Rotary dials for threshold/delay adjustment

Protection Degree: IP20 (enclosure)

5. Standards & Certifications
IEC 61557-8 (Insulation monitoring devices)

UL 61010-1 (Safety requirements)

Medical Standards: IEC 60601-1 (for hospital applications)

Advantages
✔ Universal Compatibility: Works with AC/DC IT systems
✔ Pre-Alarm Function: Early warning before critical faults
✔ Wide Threshold Range: Adaptable to sensitive environments (e.g., labs, ships)
✔ Low Power Consumption: <2W during operation

Typical Applications
Medical IT Systems (Operating rooms, ICU power)

Industrial IT Networks (Ungrounded power supplies)

Renewable Energy (Solar PV systems, battery storage)

Marine & Offshore (Shipboard electrical systems)