UNISON
803 ZDA 48 40 01, Unison SSR Dc to Ac, 40amp
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Product Description
The Unison 803 ZDA 48 40 01 is a 40 Amp DC to AC Slim Solid State Relay (SSR) engineered for reliable, maintenance-free switching in industrial automation, process control, and electrical control panels. Its 23.6 mm slim design allows maximum space utilization inside compact panels while delivering high switching performance for demanding industrial applications. Featuring Zero Cross Switching, the relay switches ON when the AC waveform crosses zero voltage, reducing electrical noise, limiting inrush current, and extending the life of both the relay and connected equipment.
The relay accepts a 4–32 VDC control input and switches 24–480 VAC loads up to 40 Amps, making it compatible with PLCs, PID temperature controllers, microcontrollers, and industrial automation systems. Built using Direct Bonded Copper (DBC) technology, it offers excellent thermal conductivity and improved heat dissipation, ensuring stable performance during continuous operation. With no moving contacts, the relay provides silent operation, high switching speed, and an exceptionally long electrical life of up to 10¹¹ switching cycles.
The SSR incorporates optical isolation between the control and load circuits, along with built-in surge voltage protection to safeguard sensitive automation equipment from electrical disturbances. Its compact construction and DIN rail-compatible heat sink arrangement make installation simple in modern control panels where space optimization is essential.
The 803 ZDA 48 40 01 is widely used in industrial heating systems, packaging machines, plastic processing equipment, textile machinery, food processing plants, and OEM automation panels. For continuous operation at the rated current, a suitable heat sink is recommended to ensure optimum thermal performance and maximum service life.
Key Features
- Model: 803 ZDA 48 40 01
- Brand: Unison
- DC to AC Solid State Relay
- Rated Load Current: 40 Amp
- Zero Cross Switching
- Slim 23.6 mm body design
- Input Voltage: 4–32 VDC
- Output Voltage: 24–480 VAC
- Optically isolated input and output
- Built-in surge voltage protection
- LED input status indication
- Long operating life (up to 10¹¹ switching cycles)
- Compact panel/DIN rail mounting
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 803 ZDA 48 40 01 |
| Brand | Unison |
| Relay Type | DC to AC Slim SSR |
| Rated Current | 40 Amp |
| Control Input | 4–32 VDC |
| Output Voltage | 24–480 VAC |
| Switching Type | Zero Cross |
| Frequency | 47–63 Hz |
| Width | 23.6 mm |
| Input to Output Isolation | 6 kV |
| Body Insulation | 4 kV |
| Surge Protection | Built-in |
| LED Indicator | Red |
| Mounting | Panel / DIN Rail with heat sink |
Use a suitably rated heat sink for continuous operation at full load.
Applications
The Unison 803 ZDA 48 40 01 is ideal for:
- Temperature control using PID controller
- Resistance heater switching
- Motor starting
- UV lamp control
- Plastic welding machines
- Industrial ovens and furnaces
- 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 available for OEMs, machine builders, and panel manufacturers
- Expert technical support for product selection
- Trusted supplier of industrial automation products
Frequently Asked Questions
1. What is the control input voltage of the 803 ZDA 48 40 01?
The relay requires a 4–32 VDC control input, making it compatible with PLCs, PID controllers, microcontrollers, and most industrial automation systems.
2. What is the advantage of Zero Cross Switching?
Zero Cross Switching turns the relay ON when the AC waveform crosses zero voltage, reducing electrical interference, minimizing surge current, and increasing the life of heaters, motors, and other connected equipment.
3. Does this SSR require a heat sink?
Yes. For continuous operation at the rated 40 Amp load, using a properly sized heat sink is strongly recommended to ensure reliable performance and longer service life.
Related Products & Collections
Also explore our complete range of Protection Relays, Phase Failure Relays, Phase Sequence Relays, and Motor Protection Devices for enhanced electrical safety.
For complete automation panel solutions, browse our collections of PLCs, Timers, Temperature Controllers, AC Drives, and SELEC automation products. You may also be interested in our range of Power Supply solutions including DIN Mounted SMPS, Enclosed SMPS, 1 Phase SMPS, 3 Phase SMPS, and popular Mean Well MDR Series, NDR Series, EDR Series, and TDR Series power supplies for industrial applications.
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