1. SX501 what works, how to understand the normally open contacts on the terminal?

A: SX501 works on contacts with the contactor to protect the motor using a purpose, the protection will be closed on the electric motor current abnormality is detected will be disconnected!

  2. SX501 how to wire?

A: Press the top of the terminal wiring diagram wiring, the 3rd terminal connected FireWire, zero line terminal 5, one end of the 1st terminal connected to the contactor coil contactor coil other end of the zero line, then the purpose of this is that when detected the motor current normally closed contacts, terminals through Firewire the 3rd closed contact terminals are connected directly to the 1st of the contactor coil, when the contactor coil is energized to work the motor is running, when the protection detects current exception is broken open contacts, the contactor coil is OFF, the motor stops!

3. What kind of circuit is generally recommended to control the motor it?

 A: We usually use a switch to control the power supply protection circuit, so we need to start the motor only when the switch is closed, on the protection of electrical work, contactor closes the motor is running, if it is detected during the operation of the current exception thereafter automatically disconnect the motor contactor stopped!

Reference wiring diagram: