Solid State Relay, 3 phase, load current 80A, DC-AC, zero-cross switch, built-in RC, optical isolation between input and out circuit, with LED indicator, no electric spark, no noise and no contact.
|On-state voltage drop
|Off-state leakage current
||2500V AC (1min)
||500МΩ with 500V DC
||Fan needed for cooling
Tips: How to choose the solid state relay(SSR)?
The key is to choose a solid state relay with appropriate rated current. Unless otherwise specified, the rectifier, controllable module and other power module will be fine.
The rated current of SSR is selected according to different load types. The instantaneous current of resistive load, inductive load and capacitive load is large when starting. Even for the load with pure resistance, the resistance value is smaller in cold state because of the positive temperature coefficient, so it has a larger starting current. Moreover, the inductive load has higher back electromotive force.
Capacitive loads have greater risks. Because the capacitor (load) is equivalent to a short circuit because the voltage at both ends of the capacitor cannot be mutated when starting. More attention should be paid to the selection of this type of load.
It is important to point out that the surge current value of SSRs which is based on thyristor surge current should not be used as the basis for selecting the starting current of the load. Its prerequisite is a half (or one) cycle of power supply, that is, 10 or 20ms. The time of startup processes above-mentioned is ranging from hundreds of milliseconds, to several minutes, even to 10 minutes. Please pay high attention to this point.