Din Rail Solid State Relay 10A–120A DD DA AA with Heat Sink

Din Rail Mount Single-Phase Solid State Relay with Heat Sink — 10A to 120A

Upgrade your electrical control panel with this versatile Din Rail Solid State Relay (SSR), available in output current ratings from 10A to 120A and three control configurations — DD (DC controlled DC), DA (DC controlled AC), and AA (AC controlled AC). Featuring no moving parts, silent switching, and fast on/off response (≤10ms), this SSR is ideal for industrial automation, temperature controllers, PLCs, motor control, heating elements, and more. The included aluminum heat sink ensures efficient thermal dissipation for stable, long-term operation. Made in Mainland China.

How to Choose Your SSR Configuration

• AA: AC input controls an AC load
• DA: DC input (3–32VDC) controls an AC load (24–480VAC)
• DD: DC input (3–32VDC) controls a DC load (5–220VDC)

How to Calculate the Right Current Rating

Use this simple formula to select the correct amperage:

1. Equipment Power ÷ Voltage = Operating Current
2. Operating Current ÷ Load Coefficient = Required SSR Rating

Load Coefficients: Resistive load: 60% | Inductive load: 30%

Example: A 1500W motor (inductive load) on 220V: 1500W ÷ 220V = 6.8A; 6.8A ÷ 0.3 = 22.7A → Select the 25A SSR.

Specifications — DA Model (DC Controlled AC)

Specifications — AA Model (AC Controlled AC)

Specifications — DD Model (DC Controlled DC)

Key Features

• ✅ Wide current range: 10A, 25A, 40A, 60A, 80A, 100A, 120A options
• ✅ Three control modes: DD, DA, and AA configurations available
• ✅ Din Rail mounting for fast, tool-friendly panel installation
• ✅ Included heat sink for efficient thermal management
• ✅ Silent, spark-free switching — no mechanical wear
• ✅ Fast switching: ≤ 10ms on/off response time
• ✅ Wide operating temperature: -30°C to +70°C
• ✅ Compatible with PLCs, microcontrollers, temperature controllers, and automation systems

Common Applications

• Industrial automation and process control
• Heating element and temperature regulation systems
• Motor starters and speed control
• PLC and microcontroller output switching
• Lighting control systems
• HVAC and refrigeration control panels

For more information on electrical safety standards and proper installation practices for industrial control components, visit OSHA Electrical Safety.

Frequently Asked Questions

Q: What is the difference between the DD, DA, and AA solid state relay configurations?

A: The letters indicate the control input and load output types. DD means DC input controls a DC load; DA means DC input (3–32VDC) controls an AC load (24–480VAC); AA means AC input (70–280VAC) controls an AC load. Choose the configuration that matches your controller output and your load type.

Q: Do I need to use the included heat sink with the solid state relay?

A: Yes — especially at higher current ratings (40A and above). Solid state relays generate heat proportional to load current. The included aluminum heat sink dissipates this heat and helps maintain safe operating temperatures, prolonging the relay's service life and ensuring reliable performance.

Q: How do I select the right current rating for my application?

A: Divide your equipment's power (watts) by the supply voltage to get the operating current. Then divide that by the load coefficient — 0.6 for resistive loads (e.g. heaters), or 0.3 for inductive loads (e.g. motors). Choose the next standard SSR size above your calculated value (10A, 25A, 40A, 60A, 80A, 100A, or 120A) for a safe and reliable installation.

Q: Is this solid state relay compatible with standard DIN rail panels?

A: Yes. This SSR is designed with a standard DIN rail mounting clip, making it quick and easy to install in any standard electrical enclosure or DIN rail panel without additional hardware.