MP and EL Industry Current Sensors Utilisation Sensors to measure d.c., a.c. or pulsating curr ents with a galvanic insulation between primary and secondary cir cuits. Type MP25P1: the rating (from 5 to 25A) is determined via a combination of the primary connections (see table: “Arrangement of primary terminals and related characteristics”). MP25P1 EL25P1 to 100P2 / EL25P1BB to 100P2BB Technical data Without primary bus bar With primary bus bar MP25P1 EL25P1 EL25P1BB EL50P1 EL50P1BB EL55P2 E.