Schneider Electric C164TM160 trip unit TM160D for ComPacT NSX 160/250 circuit breakers. thermal magnetic. rating 160 A. 4 poles 4d. Official Schneider characteristics include Range: ComPacT; Range of product: ComPacT NSX100...250; Product or component type: Trip unit; Trip unit name: TM-D; Trip unit technology: Thermal-magnetic; Range compatibility: ComPacT NSX160; Device application: Distribution; Poles description: 4P.