803 ZDA 58 90 01, Unison SSR Dc to Ac, 90amp

Product Description

The Unison 803 ZDA 58 90 01 is a heavy-duty 90 Amp DC to AC Slim Solid State Relay (SSR) engineered for high-current industrial applications requiring reliable, maintenance-free switching. Designed with Zero Cross Switching technology, the relay turns ON at the zero crossing point of the AC waveform, minimizing electrical noise, reducing inrush current, and extending the life of heaters, motors, and other connected loads. It is an excellent choice for OEM machine manufacturers, panel builders, and industrial automation systems handling large resistive and inductive loads.

The relay operates with a 4–32 VDC control input and switches 24–580 VAC loads up to 90 Amps. It is fully compatible with PLCs, PID temperature controllers, microcontrollers, and industrial control systems. The 803 series utilizes Direct Bonded Copper (DBC) technology, providing excellent thermal conductivity, reduced thermal stress, and improved long-term reliability under continuous operation.

Unlike conventional mechanical relays, the 803 ZDA 58 90 01 contains no moving contacts, ensuring silent operation, high switching speed, resistance to vibration, and an exceptionally long electrical life. The relay features 8 kV input-to-output isolation, integrated surge voltage protection, and high short-circuit withstand capability for enhanced system safety in demanding industrial environments.

The slim 23.6 mm module design enables space-saving installation on DIN rail heat sinks, making it ideal for compact control panels. This SSR is widely used in industrial heating systems, plastic processing machines, packaging equipment, ovens, textile machinery, food processing plants, and other automation applications where dependable high-current switching is required.

For continuous operation at high current, Unison recommends using the specified heavy-duty heat sink to ensure proper heat dissipation and maximum service life.

Key Features

• Model: 803 ZDA 58 90 01
• Brand: Unison
• DC to AC Slim Solid State Relay
• Rated Load Current: 90 Amp
• Zero Cross Switching
• Input Voltage: 4–32 VDC
• Output Voltage: 24–580 VAC
• Slim 23.6 mm panel-saving design
• Direct Bonded Copper (DBC) technology
• Built-in surge voltage protection
• 8 kV input-to-output isolation
• LED input status indication
• DIN rail compatible heat sink mounting
• Maintenance-free, silent operation

Technical Specifications

For continuous operation at rated current, use the recommended heavy-duty heat sink as specified by Unison.

Applications

The Unison 803 ZDA 58 90 01 is ideal for:

• Temperature control using PID controllers
• Resistance heater switching
• Motor starting
• UV lamp control
• Plastic welding machines
• Industrial ovens and furnaces
• Plastic extrusion and injection moulding machines
• Packaging and sealing machines
• Textile machinery
• Food processing equipment
• Industrial automation control panels

Why Buy from Voltkart?

• Genuine Unison Solid State Relays
• GST Invoice provided
• Pan India delivery
• Bulk pricing for OEMs, machine builders, and panel manufacturers
• Expert technical support for product selection
• Trusted supplier of industrial automation products

Frequently Asked Questions

1. What control voltage does the 803 ZDA 58 90 01 require?

The relay operates with a 4–32 VDC control input, making it compatible with PLCs, PID controllers, and industrial automation equipment.

2. Why is Zero Cross Switching beneficial?

Zero Cross Switching energizes the load at the AC waveform's zero-voltage point, reducing electrical noise, minimizing surge current, and increasing the life of heaters, motors, and other connected equipment.

3. Is a heat sink required for this 90 Amp SSR?

Yes. Since this is a high-current SSR, a properly rated heavy-duty heat sink is essential for safe continuous operation, efficient heat dissipation, and maximum service life.

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