901 ZDA 60 50 01 AL5, Unison SSR Dc to Ac, 50amp

Specifications (existing/cleaned up)

• Model: Unison 901 ZDA 60 50 01 AL5
• Type: Solid State Relay (SSR), DC control input / AC load output
• Load Current: 50A
• Control Input: DC (typically 4-32V DC control signal)
• Load Voltage: AC output, typically 24-280V AC range (model-dependent)
• Switching Type: Zero-cross or random-fire (model/suffix dependent)
• Mounting: Panel/heatsink mounting with mounting holes
• Isolation: Optically isolated input-to-output

What is this product?

The Unison 901 ZDA 60 50 01 AL5 is a solid state relay that uses a low-voltage DC control signal to switch a high-current AC load, without any moving mechanical parts. It's used wherever fast, silent, and wear-free switching of AC loads like heaters is required.

Where is it used?

• Industrial heater control panels (band heaters, cartridge heaters, oven elements)
• Plastic extrusion and injection molding machine temperature zones
• Packaging machinery with heat-sealing elements
• Furnace and drying chamber temperature control loops
• Process control panels requiring frequent ON/OFF cycling of AC loads

Key technical advantages

The 901 ZDA 60 50 01 AL5 stands out because, unlike mechanical contactors or relays, it has no moving parts to wear out — making it ideal for applications with frequent switching cycles like PID-controlled heater loops, where a mechanical contactor would fail quickly from contact arcing and fatigue. Its optical isolation between the DC control input and AC load output protects sensitive control electronics (like PLCs or temperature controllers) from electrical noise and voltage spikes on the load side. The 50A rating gives solid headroom for mid-size heater loads without needing to parallel multiple lower-rated SSRs, and Unison's build is designed to handle the electrical noise and thermal cycling typical of Indian industrial heating applications. Silent, spark-free switching also reduces electrical interference with nearby sensitive instrumentation.

Why buy from Voltkart?

Voltkart is an authorized dealer for Unison, so the 901 ZDA 60 50 01 AL5 you receive is 100% genuine with full manufacturer warranty — not a counterfeit or grey-market unit. Every order comes with a proper GST invoice, PAN India delivery with fast dispatch from our Delhi (Bhagirath Palace) warehouse, and direct WhatsApp support (+91 98996 68881 / 8800754881) for help with heatsink sizing, control wiring, or bulk order pricing.

FAQs

Q: Does the 901 ZDA 60 50 01 AL5 need a heatsink for continuous 50A operation?
A: Yes, SSRs generate heat proportional to load current even when switched on, so a properly sized heatsink is essential for continuous 50A operation — undersized cooling is the most common cause of premature SSR failure, so let us know your enclosure and ambient conditions and we can advise on heatsink sizing.

Q: What DC control voltage does this SSR accept?
A: This model accepts a DC control signal, typically in the 4-32V DC range common for PLC and temperature controller outputs — please confirm your controller's output signal type when ordering so we can verify compatibility.

Q: Is this SSR zero-cross or random-fire switching?
A: The switching type depends on the exact suffix/variant of this part number — zero-cross types are generally preferred for resistive heater loads to minimize electrical noise, while random-fire types suit phase-angle control applications. Let us know your control method and we'll confirm the correct variant.

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