Carlo Gavazzi DRC61: Smarter Isolation Monitoring for EV Fast Chargers
Carlo Gavazzi has introduced the DRC61 insulation monitoring device designed for unearthed (IT) high-voltage DC systems in Mode 4 DC fast-charging stations. The device continuously monitors insulation resistance between the DC lines and protective earth, enabling early detection of insulation degradation and improving both safety and charger availability.
Carlo Gavazzi DRC61 insulation monitoring device for high-voltage DC charging
Key Specifications and Features
Operating voltage: up to 1000 V DC (permanently admissible up to 1100 V DC)
No external voltage adapters required — single-module architecture
System leakage capacitance support: up to 25 µF
CHAdeMO mode: supports 1.6 µF per conductor
Factory default thresholds: 500 kΩ (pre-alarm) and 100 kΩ (alarm)
Continuous monitoring of both positive and negative DC lines
RS485 interface with Modbus RTU for remote monitoring and configuration
Two configurable SPST relay outputs (warning + alarm)
Compatible with CCS and CHAdeMO charging standards
DIN-rail mounting, compact industrial design
Local and remote test/reset functions + LED status indicators
Additional monitoring of undervoltage and overvoltage conditions
Fail-safe design (outputs de-energised on critical failure or power loss)
UL 2231-1 and UL 2231-2 listed
By detecting insulation resistance drop early, the DRC61 allows operators to perform preventive maintenance instead of reacting only after a fault occurs. This reduces downtime and increases the reliability of high-power EV charging stations.
Target Applications
Mode 4 DC fast-charging stations
Battery energy storage systems (BESS)
DC microgrids
Other high-voltage unearthed DC installations
The DRC61 simplifies system design by eliminating external adapters, reduces component count, and helps OEMs optimise space and cost in modern high-power charging infrastructure.
