Te connectivity sr4 series safety relays pcb mounting te connectivity 4 1415053 1 an 8a 24v dc 4 pole pcb mounting safety relay with a 3pst no spst nc contact configuration the relay has forcibly guided contacts and its small overall dimensions make it suitable for dense population on boards in applications such as emergency shut offs machinery control elevator and escalator control light barrier controls etc te connectivity sr4m4024 3pst no spst nc pcb relay 24vdc 8a