Eaton ESR5-NO-31-24VAC-DC Safety Relay, Single Dual Channel Main Unit, 3 NO Safety Output, 1 NC Signal Output, 24 VAC/DC Control Voltage: Electronic Relays: Amazon.com: Industrial & Scientific
LEUZE MSI-SR4B-01 547950, SAFETY RELAY, CATEGORY: 4, IEC/EN 60204-1, STOP CATEGORY: 0, IEC 61508, PERFORMANCE LEVEL (PL): E, (547950), EN ISO 13849-1, SIL: 3, CONTACTS (NO CONTACT/NC CONTACT): 3 NO CO: Amazon.com: Industrial & Scientific