AC network insulation monitor LK 5894

DCAC/DCDIN rail

The insulation monitor LK 5894 of the varimeter IMD family provides best and up to date insulation monitoring of modern IT systems in an optimum and state of the art way fulfilling the relevant standards. The device can be used in the most flexible way for AC, DC and AC/DC systems even with large leakage capacity to earth (PE). The adjustment of the setting values is simple and user friendly done on 2 rotary switches on the front of the device. Via LEDs the measured value, device parameters and device status are indicated easy to read. Features • Insulation monitoring according to IEC/EN 61557-8 • Detection of symmetric and asymmetric insulation faults • 2 changeover contacts • Prewarning threshold setting range: 20 kΩ ... 2 MΩ • Alarm threshold setting range: 1 kΩ ... 250 kΩ • Energized or de-energized on trip can be selected for output relay • Setting the maximum leakage capacitance to shorten the response time • Simple, clearly arranged adjustment of the device with screwdriver • LED chain to indicate the current insulation resistance • Display of active measuring circuits • Automatic and manual device self-test • Width: 90 mm Advantages / Customer benefit • Preventive fire and system protection • Quick fault localisation through selective earth fault detection to L+ and L- • Universal application in non-earthed AC, DC, AC/DC networks with up to 690 V nominal voltage • Suitable for large leakage capacitances up to 1000 μF • Simplest setting via engaging rotary switches • Optimised measuring times - normally shorter than with known methods • Monitoring also with voltage-free mains • Measuring circuit with broken wire detection • No additional coupling device required