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Function blocksCat.Nos371 53 250 - - - - - 2.5 - -371 54 250 - - 1 - - 2.5 - -371 55 500 300 300 1 1 1 4 10 10371 56 12 to 24 12 to 24 12 to 24 32 30 30 4 10 10IEC 60947-7-1, CSA no. 22-2 no. 158, UL 1059Cat.Nos 371 53/5471.265.926.8Schematic diagramsCat.No 371 53Voltage (V) Current (A) Nominal cross- sectionIEC CSA UL IEC CSA UL46.554Cat.Nos 371 55/5674.872.2Cat.No 371 5462.570IEC(mm 2 )CSA(AWG)Cat.No 371 55UL(AWG)Block for actuator Cat.No 371 52 PNE block Cat.No 371 52ToPhaseactuatorsNeutralSignalSignalAutomationBridging combCat.No 375 47Disconnect block for measurementIEC EN 60947-7-1Cat.No 371 9273.2commonVoltage (V) Current (A) Nominal cross- sectionCat.NosIEC CSA UL IEC CSA ULIEC CSA UL(mm 2 ) (AWG) (AWG)371 92 800 - - 24 - - 4 - -6269.5Cat.No 371 56+ +--Diode for Cat.Nos 371 54/55- 1N4007 type 1A- direct current = 1A- peak inverse voltage 1000 V- inverse current 5 µA at 25°CWiring principle for measurement blocks Cat.No 371 92Ammeter circuitWattmeter circuitBlocks for sensors and actuators/PNEVoltage (V)Current (A)Nominal cross- sectionCat.NosIEC CSA UL Ie IEC CSA ULIEC CSA UL(mm 2 ) (AWG) (AWG)371 51400 300 300 27 24 20 20 2.5 12 12371 52IEC 60947-7-1/7-2, CSA no. 22-2 no. 158, UL 1059Ie: Rated current NF C 15100 table 52H, column 4Cat.Nos 371 51/52Wiring principleBlock for sensor Cat.No 371 51Signal84.5AutomationBridging combCat.No 375 4738.867.474.9Power supplyor Ph - NSignalSensorsPower supply(shared)NormalpositionTestpositionStripped lengths (mm)Short-circuitpositionPer circuit:2 x Disconnect blocks for measurementCat.No 371 924 x Measurement sockets for Ø4 mm plugCat.No 375 771 x End cap Cat.No 375 571 x Shunt with Ø4 mm plugsL1L2L3NPEScrew terminal pitch (mm) Rigid or flexible wire566to881010 to 1212 13 to 1715 14 to 1822 15 to 2210 x Disconnect blocks for measurementCat.No 371 9212 x Measurement sockets for Ø4 mm plugCat.No 375 771 x End cap Cat.No 375 573 x Shunts with Ø4 mm plugsProtection against fire and panic risks in publicbuildings/UTE C 12-201 guideArt. EL 3, definitions: "Security installations are those that haveto be put into or maintained in service to ensure the evacuationof the public" or facilitate the intervention of the first-aidArt. EL 16, power supply circuits in security installations section1a: "…the corresponding junction or deviation devices and theirenclosures except for the waterproofing systems must satisfythe incandescent wire test defined in the standard in force, thetemperature of the incandescent wire being 960 °C"Viking 3 terminal blocks satisfy the incandescent wire test 960 °Caccording to standard IEC 60695-2-1121