803 ZDA 58 50 01 Unison SSR DC to AC, 50 Amp

The Unison 803 ZDA 58 50 01 is a heavy-duty single-phase Solid State Relay (SSR) designed for reliable switching of AC loads through a DC control signal. Rated for 50A load current, this SSR is ideal for industrial automation systems where frequent switching, silent operation, and long service life are essential. Unlike conventional electromechanical relays, the 803 ZDA 58 50 01 contains no moving contacts, eliminating contact wear and reducing maintenance requirements.

The relay utilizes zero-cross switching technology, which turns the load ON when the AC waveform crosses zero voltage. This helps minimize electrical noise, reduce inrush current, and extend the life of connected equipment. Its optically isolated input provides excellent protection between the control circuit and power circuit, making it suitable for PLC-controlled automation panels and industrial machinery.

With its compact design and robust construction, this Unison SSR is widely used for controlling heaters, ovens, packaging machines, and process control equipment. For optimum performance at higher load currents, a properly sized heat sink should be used during installation.

Key Features

• Single Phase DC to AC Solid State Relay

• 50 Amp load current rating

• DC control input compatible with PLCs and controllers

• AC load switching output

• Zero-cross switching technology

• Optically isolated input and output

• Silent operation with no moving contacts

• Long electrical life and low maintenance

• Compact industrial design

• Suitable for frequent switching applications

Applications

• Industrial heating systems

• Plastic processing machines

• Packaging and sealing machines

• Temperature control panels

• Industrial ovens and furnaces

• Textile machinery

• Process automation systems

• PLC-based control panels

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. What is the advantage of using an SSR instead of a contactor?
A solid state relay offers silent operation, faster switching, longer service life, and no contact wear, making it ideal for applications involving frequent switching.

Q2. Is a heat sink required for the 50A SSR?
Yes. For higher load currents, a suitable heat sink is strongly recommended to dissipate heat and ensure reliable operation.

Q3. Can this SSR be controlled directly from a PLC output?
Yes. The DC input is compatible with most PLCs, controllers, and industrial automation systems.

Q4. What loads can be controlled using this SSR?
The relay is commonly used for heaters, ovens, packaging machines, temperature control systems, and other industrial AC loads requiring reliable switching.

Q5. Is this relay suitable for continuous industrial operation?
Yes. The Unison 803 ZDA 58 50 01 is designed for demanding industrial environments and continuous-duty applications when installed with proper heat management.