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    Solid state relay SSR-120DA, 120A 3-32V DC to AC

    Low cost 120A single phase solid state relay SSR-120DA , input voltage 3-32V DC, load voltage 24-480V AC, LED indicator, excellent quality, high reliability and brand new.
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    Delivery date: 6-12 days

    Solid State Relay Features

    • SSR load current 120A (DC to AC)
    • Built-in RC
    • LED indication
    • Zero-crossing switch

    120DA SSR Specification

    Basics Model ATO-SYDH12048ZD3
    Size 57.4х44.8х28mm
    Weight 135g
    Mounting method Bolted
    Ambient temperature -20℃~75℃
    Humidity ≤95% (non-condensing)
    Technical parameters Control mode DC-AC
    Load voltage 24~480V AC
    Load current 120A
    Control voltage 3~32V DC
    Control current DC 3-25mA
    On-state voltage drop ≤1.5V
    Off-state leakage current ≤2mA
    Off-state time ≤10ms
    Dielectric strength 2500V AC (1min)
    Insulation resistance 500МΩ with 500V DC
    LED indication YES
    Cooling Need fan for cooling or water cooling

    Solid State Relay Dimensions

    SSR single phase dimensions

    SSR Wiring Diagram

    SSR single phase wiring dc ac

    Tips: Construction of solid state relays

    Solid-state relays consist of three parts: the input circuit, isolation (coupling) and the output circuit.

    1. Input circuit
      According to different types of input voltage, the input circuit can be divided into DC input circuit, AC input circuit and AC-DC input circuit. Some input control circuits also have TTL / CMOS compatible, positive and negative logic control and anti-phase functions, etc. and can be easily connected with the TTL, MOS logic circuit. For the control signal with fixed control voltage, a resistive input circuit is used. The control current is guaranteed at 5mA or higher. For control signals with a large range of voltage (such as 3 ~ 32V), use a constant current circuit to ensure that the current works reliably at 5mA or higher over the entire voltage range.
    2. Isolation and coupling
      The way of isolation and coupling of solid state relays’ input and output circuit includes photo coupling and transformer coupling. Photo coupling usually uses the photodiode - phototransistor, photodiode - bidirectional light activated SCR, photovoltaic cells, to achieve isolation control of the control side and the load side; high-frequency transformer coupling is to use the self-excited high frequency signal generated by input control signal to form a drive signal through coupling to the secondary, rectification, and logic circuit process.
    3. Output circuit
      The power switch of SSR is directly connected to the power supply and load terminal to switch on and off the load power supply and mainly uses high power transistors (switch tube-Transistor), unidirectional SCRs (Thyristor or SCR), bilateral SCR (triac), metal-oxide -semiconductor field effect transistor (MOSFET), insulated gate bipolar transistor (IGBT). Solid state relays’ output circuits can also be divided into DC output circuit, AC output circuit and AC-DC output circuit and other forms. According to the load type, it can be divided into DC solid state relay and AC solid state relay. Bipolar devices or MOSFETs can be used for DC output and two SCRs or a triac for AC output. AC solid state relays can be divided into single-phase AC solid state relays and three-phase AC solid state relays. AC solid state relays, according to the timing of turn-on and turn-off, can be divided into random AC solid state relays and zero-crossing AC solid state relays.

    Solid state relay (SSR) is simple but widely used in the automation fields. Thus, it is not complex to wire a solid state relay. In this vedio, ATO takes a 40 Amp SSR (DC - AC) for example to show the wiring of a SSR and then switch on/off a motor with this SSR.

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