What this product is
Built into a hardened metal sub-rack cassette, the PSM-D21 incorporates a 32-bit industrial microprocessor, conformal-coated multi-layer PCBs, and optical isolation across all external measurement and communication channels. It interfaces seamlessly with Emerson utility rectifiers, DC distribution sub-racks, and third-party RTUs using native Modbus-RTU, CDT, and DL/T645 protocols compliant with IEC 61000-4 and IEEE substation automation standards.
What problem it solves
It eliminates the risk of silent DC bus collapse caused by undetected battery cell deterioration, ground fault insulation breakdown, and unmanaged thermal runaway during recharging cycles. Furthermore, its live hot-pluggable architecture resolves the operational requirement of taking entire DC tripping circuits offline during supervisory maintenance, ensuring continuous breaker trip-coil readiness.
Who and where it is for
Engineered for 110kV through 500kV electrical transmission and distribution substations, UHV converter stations, thermal, hydro, and nuclear power generation plants, metro traction power substations, and heavy industrial plant DC distribution switchboards.
