We are using Atmega644 PA-AU and trying to drive AC Contactors via relays. The relays are based on Johnny-five Relay Class through StandardFirmataEthernetPlus. When we are driving just the relay ...

Contactors are used for switching more than 15 amperes or in circuits rated more than a few kW. Except for optional auxiliary low-current contacts, contactors normally have open contacts and are used ...

When voltage sags occur inside or outside of a facility, properly placed power quality mitigation technology will save sensitive equipment from costly shutdowns. The cost of this mitigation equipment ...

In this troubleshooting situation, the customer’s complaint is that their office air conditioner is “not cooling at all.” When you arrive, you confirm that the indoor air temperature is far above the ...