Dold Voltage Monitoring Relay, 1, 3 Phase, DPDT, 0 → 500V ac, DIN Rail

For AC and DC network currents with 0 → 500 V and 10 → 1000 Hz
Also monitors non-powered networks
Adjustable alarm value (R) from 5 → 100 KΩ
Rest current principle
LED display for operating readiness status and insulation error
Galvanic isolation of measuring circuit, auxiliary voltage and output contacts
Programmable for memory and hysterisis action
Delete and test buttons
2 switchers

Monitoring of insulation resistance of unearthed AC and DC networks.

Complies with IEC 255, EN 61 557 and VDE 0413