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CURRENT SSR

  • CURRENT SSR
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    • CURRENT SSR

    Description

    The Denki Seigyo Analog Current SSR Series is designed for precision power control applications requiring smooth, proportional switching of AC or DC loads. Unlike conventional ON/OFF relays, these SSRs respond to analog current input signals to deliver variable output voltage or current, enabling precise regulation of heaters, motors, and lamps.
    With high-reliability semiconductor switching, optical isolation, and fast response, Denki Seigyo SSRs ensure long operational life, low maintenance, and silent, arc-free performance in industrial control systems.

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    CURRENT SSR
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    Features

    • Linear proportional control based on analog current input (4–20 mA or 0–20 mA)

    • Zero-cross or phase-angle control models available

    • Optically isolated input for electrical noise immunity

    • Fast response with no contact bounce or arcing

    • Low leakage current and minimal output voltage drop

    • Built-in over-temperature and surge protection

    • Compact, DIN-rail and panel mountable enclosures

    • Long service life with solid-state switching (no moving parts)

    • Ideal for resistive, inductive, and heater load control

    Specifications

    Item Specification
    Control Input Signal 4–20 mA DC (optional 0–20 mA / 1–5 VDC)
    Input Impedance 250 Ω (typical)
    Control Type Phase control / Zero-cross
    Load Voltage Range 24–480 VAC (RMS) / 24–110 VDC (model dependent)
    Load Current Rating 5 A, 10 A, 25 A, 40 A, 60 A, 80 A
    Turn-On Time ≤1 ms (zero-cross type)
    Turn-Off Time ≤1/2 cycle (8.3 ms at 60 Hz)
    Dielectric Strength 2.5 kVAC (Input–Output), 1.5 kVAC (Output–Base)
    Isolation Resistance ≥100 MΩ at 500 VDC
    Leakage Current (Off-State) ≤10 mA (at rated voltage)
    Voltage Drop (On-State) ≤1.6 V RMS (at rated load current)
    Operating Temperature -20°C to +80°C (no condensation)
    Cooling Method Natural convection or with optional heat sink
    Protection Built-in surge absorber, overheat cutoff (optional)
    Indicator Power (Green LED), Output ON (Red LED)
    Mounting Type DIN-rail or panel mount
    Housing Material Flame-retardant PC (UL94-V0)
    Weight Approx. 150–250 g (depending on model)

    Model Selection Table

    Model Control Signal Load Voltage Load Current Control Type Mounting Cooling Option
    DSSR-A05C 4–20 mA 24–280 VAC 5 A Zero-cross Panel mount Natural
    DSSR-A25C 4–20 mA 24–480 VAC 25 A Zero-cross DIN rail With heat sink
    DSSR-A40P 4–20 mA 24–480 VAC 40 A Phase control Panel mount Forced air
    DSSR-A60P 4–20 mA 24–480 VAC 60 A Phase control DIN rail Forced air
    DSSR-D10C 4–20 mA 24–110 VDC 10 A Linear control Panel mount Natural
    DSSR-D25C 4–20 mA 24–110 VDC 25 A Linear control Panel mount With heat sink

    Applications

    • Proportional temperature control for industrial heaters

    • Dimming and intensity control for industrial lamps

    • Variable-speed control for AC fans and motors

    • Process automation systems requiring analog signal control

    • OEM equipment, plastic molding, packaging, and drying machines

    Optional Accessories

    Part Number Description
    DHS-200C Compatible heat sink (200 mm, 0.4 °C/W)
    DSC-420M 4–20 mA signal converter module
    DBR-24V 24 VDC control power supply
    DMH-SRL01 Mounting rail and bracket kit

    Ordering Example

    Model: DSSR-A25C
    Description: Analog current solid state relay, 4–20 mA input, 25 A load, 24–480 VAC output, zero-cross control, DIN-rail mount