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Single-Phase Solid State Relay – DC to AC / AC to AC / DC to DC Control, 10A–25A

Single-Phase Solid State Relay – DC to AC / AC to AC / DC to DC Control, 10A–25A

PriceFrom $55.42
Industrial single-phase solid state relay for reliable, silent switching of AC or DC loads, supporting multiple control and load voltage combinations.

This single-phase solid state relay (SSR) is designed for dependable switching and regulation of electrical loads in industrial automation, heating control, and process equipment. It supports DC-controlled AC, AC-controlled AC, and DC-controlled DC configurations, making it suitable for a wide range of control systems including PID controllers, PLC outputs, and analog regulators.

With no mechanical contacts, the relay delivers silent operation, fast switching, and long service life. Integrated protection circuitry and LED status indication improve reliability and simplify diagnostics in control panels.

The device is sealed for enhanced durability and is intended for panel or heat-sink mounting in industrial enclosures.

Key Features

  • Single-phase solid state relay

  • Supports:

    • DC control → AC load

    • AC control → AC load

    • DC control → DC load

  • Silent, contact-free switching

  • Long operating life with high switching frequency capability

  • LED status indicator

  • Sealed construction for improved reliability

  • Built-in RC snubber for noise suppression

  • Available with zero-cross or random turn-on operation

Switching Characteristics

  • Zero-cross switching (standard)

    • Ideal for resistive loads

    • Reduces electrical noise and inrush current

  • Random turn-on (optional)

    • Suitable for phase control and inductive loads

    • Must be specified at time of order

Electrical Ratings

  • Load Type:

    • Single-phase AC or DC

  • Load Voltage:

    • Up to 480V (application dependent)

  • Current Ratings:

    • 10A / 25A variants available

  • Control Input:

    • DC or AC (variant dependent)

Load Selection Guidelines

To ensure long service life, select SSR current rating using the following rules:

  • Resistive load:
    SSR current ≥ 2 × load current

  • Inductive load:
    SSR current ≥ 6 × load current

  • Capacitive load:
    SSR current ≥ 10 × load current

Thermal Management Requirements

  • A heat sink is mandatory for correct operation

  • Apply thermal (silicon) grease between relay and heat sink

  • If operating current exceeds 60A, forced air cooling (fan) is required

  • Heat sink surface temperature must remain below 80 °C

Protection Recommendations

  • Install a fast-acting fuse to protect against load short circuits

  • Use a varistor (MOV) when switching inductive loads

  • Ensure adequate enclosure ventilation

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