905 3PH ZDA 48 40 01 Unison 3 Phase SSR DC to AC, 40 Amp (Without Heat Sink Base)

The Unison 905 3PH ZDA 48 40 01 is a high-performance 3-phase solid state relay (SSR) designed for reliable switching of three-phase AC loads using a DC control signal. With a 4-32VDC input and 24-480VAC output rating up to 40A, this SSR provides fast, silent, and maintenance-free operation for industrial automation applications. The relay utilizes zero-cross switching technology, helping to reduce electrical noise and minimize stress on connected equipment during switching operations. It is suitable for applications where frequent switching and long service life are required. The model is supplied without a heat sink base, allowing users to select a suitable heat sink according to their installation requirements and load conditions. Features such as opto-isolation, inbuilt snubber circuitry, and surge protection enhance reliability in demanding industrial environments.

Key Features

• 3 Phase DC to AC Solid State Relay

• Input: 4-32VDC, 15-20mA

• Output: 24-480VAC, 47-63Hz

• Load Current: Up to 40 Amp

• Zero Cross Over Switching

• Opto-Isolated Input and Output

• Inbuilt Snubber Circuit

• Surge Voltage Protection

• Silent Operation with No Moving Parts

• Supplied Without Heat Sink Base

Applications

• Industrial control panels

• PLC and automation systems

• Three-phase heaters and ovens

• Packaging and process machinery

• HVAC equipment and blower systems

• Conveyor systems and motor control applications

• Textile and printing machines

Why Buy From Voltkart?

• Authorised Mean Well distributor in India

• GST invoice provided

• Pan India delivery in 5-7 days

• Bulk pricing available on WhatsApp

FAQs

Q1. Does this SSR include a heat sink?
No, this model is supplied without a heat sink base. A suitable heat sink should be selected based on the load current and operating conditions.

Q2. What control signal is required for this SSR?
The relay accepts a DC control input of 4-32VDC, making it compatible with most PLCs, controllers, and automation systems.

Q3. What are the advantages of a solid state relay over a mechanical contactor?
Solid state relays offer silent operation, faster switching, no contact wear, reduced maintenance, and longer service life in applications involving frequent switching.

Q4. Can this SSR be used for three-phase heaters and motors?
Yes, it is commonly used for controlling three-phase resistive loads such as heaters and various industrial automation applications. Proper heat sinking and load sizing are recommended.