ABB 1MRK000007-21 Expansion Unit – Key Component for Substation Protection Logic Upgrade
ABB 1MRK000508-BDR04/1MRK000007-21 are “signal adaptation and function expansion experts” for relay protection systems! The former focuses on analog signal isolation and conversion, resolving signal incompatibility issues between different devices (such as sensors and protection devices); the latter is responsible for protection logic expansion, adding key protection functions such as ground fault and overload protection. Both are compatible with mainstream relay protection devices such as ABB REF615 and REF542plus. Original manufacturer quality, strong compatibility, and excellent anti-interference capabilities ensure complete and reliable power system protection functions! 1MRK000508-BDR04 Function: Analog signal isolation and conversion (0-10V/4-20mA bidirectional adapter), signal anti-interference filtering, precise range adjustment.
1MRK000007-21 Function: Protection logic extension (ground fault protection, overload protection), fault signal output and interlocking control.
Compatible Systems: ABB REF615, REF542plus, REF610 relay protection devices.
Operating Voltage: DC 110V/220V (optional, ±15% fluctuation allowed).