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 desired. The relay features a high current rating, a wide AC voltage range, zero-crossing switching, and LED status indication.
Zero-crossing switching means that the relay turns the load on or off when the alternating (AC) drive voltage crosses zero volts, when the voltage is at its lowest point. This provides several benefits, especially when controlling resistive or moderately inductive loads. It significantly reduces EMI, increases the service life of connected loads, lowers thermal stress on the relay, and improves current control during startup.
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
- Single-phase
- Zero-crossing switching
- LED indicator indicates when the relay is active
- Screw terminal connections with fork/ring terminals (included)
- 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
