I am using a SainSmart 5V 2-Channel Relay Module for Arduino to drive a hot plate (110V, 1000W).
I plugged my Arduino VCC and GND to the VCC and GND pins of the relay board and I drive both relays simultaneously through one of the digital output pin. The relays are controlling both the phase and the neutral of the cooking plate. In order to control my temperature, I turn the relays on or off in a 15 seconds window.
Twice, already, my relays appeared to die. The LED still works, and I still hear the noise when it is toggled, but the contact is not made anymore.
What am I doing wrong? How can I fix it?