If you want a simple switch that can manage more current, you will find that this power relay works well.
AMAT 1200-01121 Idec Relay RH1B-U DC 24 Volts SPDT Midget-Pwr 5A 750W Blad 10 qt
You will find that the relay stays cool to the touch even after repeated cycles, which adds confidence during longer testing sessions.