UMS Series Reed Relays Standex-Meder Electronics UMS Series Reed Relays are designed for limited space applications and offer a drop-in SIL replacement. The slim molded body and internal magnetic shield allow for use in very close stacking matrices often required in test and measurement applications. The UMS Series Reed Relays from MEDER feature an internal diode, PCB through hole mounting, and hermetically sealed thermoset molded encapsulation.