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SERIES SRB 301 STSERIES SRB 301 ST - 230VSERIES SRB 301 SQ - 230VGeneral PurposeSafety Controllers(for dry contact andPNP-type input monitoring)Model SRB 301 ST shown.DescriptionThe above “general-purpose” safety controllers aredesigned for use with safety devices having Normally-Closed (N.C.) or PNP-type switching outputs. Each isequipped for connection of one input device in singleordual-channel configuration. In addition they featureplug-in screw terminals, user-selectable monitoredmanualor automatic reset, feedback monitoring ofpositive-guided controlled loads and cross-shortrecognition (on selected models).Front ViewTECHNICAL FEATURESInput VoltageSRB 301 STSRB 301 ST - 230 VSRB 301 SQ - 230 V24 VAC / DC48 - 230 V AC48 - 230 V AC# Discrete Input Devices 1 (Single or Dual-Channel)MonitoredMonitored ContactN.C. (Dry Contacts) PNP-switchingConfigurationNumber & Type3 N.O. (Dry Contacts)Safety OutputsNumber & Type Auxiliary 1 N.C. (Dry Contacts)(Non-Safety orSignalling Output)Typical Input Devices • E-stops (N.C.)Monitored• Interlock switches (N.C.)• Devices with PNP semiconductoroutputs (SRB 301 ST only)Type of Reset(Selectable)Feedback MonitoringLED DisplaysConformity to StandardsStop Category 0• Monitored-manual(24 VDC trailing edge)• AutomaticYesGreen LEDs for:• K1 (safety relay 1)• K2 (safety relay 2)• Ui (voltage beyond internal fuse)•UB (voltage at input terminals,SRB 301 ST only)UL, CSA, BG (CE-compliant)Safety Control Category 4Rating Per EN 954-1Type FuseHybridSelected Features• Cross-short recognition (SRB301ST 24 VAC / DC &SRB 301 SQ only)• Plug-in screw terminals• Selectable monitored-manual orautomatic reset• Feedback monitoringAVAILABLE MODELSModel NumberOperating VoltageSRB 301 ST*24V AC/DC344Model SRB 301 ST shown.SRB 301 ST - 230 V 48-230VACSRB 301 SQ - 230 V* 48-230VAC*Feature cross-short recognition.