The second circuit adds a relay contact to power the load so that the stop pushbutton does not conduct load current. The industrial relay suggested can handle 15A AC or DC (up to 30V). Note that ...

This is ideal for driving my 133mA relay coil. The input also has the undocumented, but better known, feature of a Schmitt trigger that provides positive switching. 555 Relay Driver Schematic ...

1. The well-established relay-driving circuit uses an optocoupler to isolate the grounds and noise coupling between the low-voltage digital-control signal circuit (left) and the relay as load (right).

IXYS Integrated Circuits Division Introduces New Power Solid State Relay (SSR) with 5kv Isolation Voltage The CPC1907B Power Relay is ideal for Industrial Controls, Motor Controls and Security ...