digilog.pk stocks a comprehensive range of relay modules, solid state relays, push buttons, toggle switches, and contactors for home automation, industrial control, and electronics projects in Pakistan. From simple single-channel 5V relay modules compatible with Arduino to DIN-rail industrial SSRs handling 40A at 220V AC, we have the right switching solution at competitive prices.

Why Use Relays?

• Isolate high-voltage loads — control 220V AC appliances safely from a 5V microcontroller signal
• Zero-cross switching (SSR) — solid state relays switch at zero voltage crossing, reducing EMI and extending load life
• Multi-channel boards — 2, 4, 8, and 16 channel relay boards for complex automation
• Optocoupler isolation — most modules include optical isolation to protect your microcontroller
• Wide load compatibility — resistive, inductive, and capacitive loads from 1A to 40A

Types Available

• Single-channel relay module — 5V coil, 10A/250VAC contacts; for beginners and simple automation
• Multi-channel relay boards — 2, 4, 8, 16 channels; for home automation controllers
• Solid State Relay (SSR) — no moving parts; silent; for heating elements, AC motors, and dimmer-safe loads
• Reed relay — magnetically actuated; for sensitive signal switching
• Latching relay — holds state without continuous power; for low-power installations
• Contactors — heavy-duty 3-phase switching for industrial motor starters

Related Categories

Trigger relays with Arduino or ESP32 boards over WiFi for smart home projects. Power relay coils from our Power Supplies & Adapters. Protect circuits with components from Electronic Components. Control AC loads alongside solar systems from Solar & Inverter.

Common Applications

• Smart home — WiFi-controlled lights, fans, and AC sockets with ESP32 + relay module
• Industrial automation — PLC output expansion with DIN-rail SSRs
• Water pump control — float switch + relay for automatic water tank filling
• Temperature control — PID controller + SSR for reflow ovens and incubators
• Generator auto-start — voltage sensing relay for UPS and backup systems

How to Choose

1. AC or DC load? — standard relay handles both; SSR is AC-optimized
2. Current rating — rate the relay at least 2× the expected continuous load current
3. Coil voltage — 5V for Arduino/ESP32 direct drive; 12V for automotive
4. Silent operation needed? — choose SSR; mechanical relays click on every transition

Learning Resources

• Relay Module with Arduino — Random Nerd Tutorials — wiring and code walkthrough
• ESP8266 WiFi Relay Web Server — control AC loads from a browser
• Solid State Relay — Wikipedia — technical explanation of SSR operation
• Last Minute Engineers — Relay Tutorial — active-high vs active-low relay wiring

Need enclosures or DIN rails for panel-mount installations? Check our Cables & Connectors for terminal blocks and wiring accessories. For bulk industrial automation supply contact info@digilog.pk.