Product description
SSR‑4028ZD3 – Robust Solid State Relay from QLT Power. The SSR‑4028ZD3 is a robust solid state relay (SSR) from QLT Power. It can replace mechanical relays in industrial applications where silent operation, high durability, and fast switching are required. The relay features a high rated current, a wide AC voltage range, zero-cross switching, and LED indication.
Zero-cross switching in solid state relays means the relay activates or deactivates the load when the alternating (AC) drive voltage crosses zero volts - i.e., when the voltage is at its minimum in the sinusoidal cycle. This offers several technical advantages, especially for controlling resistive or moderately inductive loads. It significantly reduces EMI interference, increases the lifespan of connected loads, lowers thermal stress on the relay, and provides better inrush current control.
Specifications:
- Control voltage: 3–32 VDC (compatible with 3.3 V and 5 V logic levels)
- Rated current (max): 40 A (requires heatsink)
- Rated voltage: 24–280 VAC
- Phases: Single-phase
- Zero-cross switching: Yes
- LED indicator: Shows relay activation
- Wiring: Screw terminals
- Frequency range: 47–63 Hz
- Weight: 159 g
- Operating temperature: –20 °C to +80 °C
Applications:
- Industrial control systems: Especially where silent and fast AC switching is required
- Automation & machinery: For example, pump control, heating, or lighting systems
- Retrofits: An efficient choice for upgrading legacy systems using mechanical relays
- Wide voltage compatibility: Operates from 24 to 280 VAC
