Unison 901 ZDA 60 90 01 CU2 Solid State Relay | 90A DC to AC Zero Cross SSR

The Unison 901 ZDA 60 90 01 CU2 Solid State Relay (SSR) is a high-performance 90 Amp DC to AC Zero Cross Solid State Relay designed for reliable switching of high-current AC loads using a low-voltage DC control signal. With a 4–32VDC input and 24–600VAC output, this industrial SSR is widely used in industrial automation, temperature control systems, heating applications, packaging machinery, PLC panels, and process control equipment where silent, fast, and maintenance-free switching is essential.

Unlike conventional electromechanical relays, the Unison 901 ZDA 60 90 01 CU2 contains no moving contacts, ensuring silent operation, faster switching, and significantly longer service life. The relay uses Zero Cross switching technology, which turns the load ON only when the AC waveform crosses zero voltage. This minimizes electrical noise (EMI), reduces switching surges, and extends the life of heaters and other resistive loads. It features a 90A load rating, 1600V peak blocking voltage, 6kV body isolation, 8kV input-to-output isolation, and built-in surge protection. For continuous operation at high loads, a suitable heat sink is recommended.

Manufactured by Unison Controls, this SSR is trusted by panel builders, machine manufacturers, OEMs, and automation engineers for dependable performance in demanding industrial environments.

Key Features

• Genuine Unison Solid State Relay
• Model: 901 ZDA 60 90 01 CU2
• DC Input: 4–32VDC / 4–16mA
• AC Output: 24–600VAC, 47–63Hz
• Rated Load Current: 90A
• Zero Cross switching for reduced electrical noise
• Silent, maintenance-free operation
• High-speed electronic switching
• Built-in surge voltage protection
• LED input status indication

Technical Specifications

• Model: 901 ZDA 60 90 01 CU2
• Brand: Unison Controls
• Product Type: Solid State Relay (SSR)
• Input Voltage: 4–32VDC
• Input Current: 4–16mA
• Output Voltage: 24–600VAC, 47–63Hz
• Rated Load Current: 90A
• Switching Type: Zero Cross
• Peak Blocking Voltage (PIV): 1600Vpk
• Input to Output Isolation: 8kV
• Body Isolation: 6kV
• Mounting: Panel Mount (Heat Sink Recommended)
• Operating Temperature: Industrial Grade

Applications

• Industrial heater control systems
• Temperature controller output switching
• PLC automation panels
• Packaging and sealing machines
• Plastic processing machinery
• Industrial ovens and furnaces
• Textile machinery
• Conveyor systems
• Process automation equipment
• Industrial control panels

Why Buy From Voltkart?

• Genuine Unison Controls products
• GST invoice provided with every order
• Pan India delivery in 5–7 days
• Bulk pricing available on WhatsApp
• Expert technical support for product selection

Frequently Asked Questions

Q: What is the input and output voltage of the Unison 901 ZDA 60 90 01 CU2?

A: The relay accepts a 4–32VDC control input and switches 24–600VAC output loads up to 90A using Zero Cross switching technology.

Q: What is the advantage of Zero Cross switching?

A: Zero Cross switching turns the relay ON when the AC waveform crosses zero voltage, reducing electrical noise, minimizing inrush current, and increasing the life of heaters and resistive loads.

Q: Does this SSR require a heat sink?

A: Yes. For high-current or continuous-duty applications, a suitable heat sink should be used to maintain safe operating temperatures and ensure maximum relay life.

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