I have a simple circuit to power on and off a heater with a command line using mains, only fews 10mA is necessary.
My cicrcuit is based on a Fairchild MOC3041 commanded by a transistor and directly connected to the command line of the heater.
When switched on the triac in the MOC3041 is never off even I don't send anymore current in the command diode.
When I disconnect the load, the triac is switched off and I can switch on it but it is not possible to switch off whithout disconnecting the load.
I also try with a 50W lamp, it is the same problem.
Is anybody can help me?