GCT PCB Mounted Relays: RLP20, RLP30, and RLP70

Introduction

GCT RLP20, RLP30, and RLP70 PCB-mounted relays are through-hole power relays designed for dependable switching in compact electronic systems. Available with several coil voltages and contact arrangements, these relays provide an effective interface between low-voltage control circuitry and higher-current loads.

Part Description

The GCT RLP relay family includes the RLP20, RLP30, and RLP70 series of PCB-mounted, through-hole relays. They are intended for applications requiring reliable electrical isolation and controlled switching of AC or DC loads.

Key characteristics include:

• Through-hole PCB mounting for secure mechanical attachment
• Form A and Form C contact configurations
• 5 V, 12 V, and 24 V coil voltage options
• Load-switching capability ranging from 3 A to 16 A, depending on the model
• Flux-tight construction to help protect internal relay components during PCB assembly and cleaning processes
• Suitable for power switching, control circuits, appliance electronics, HVAC equipment, and automation systems

Form A versions provide normally open switching, making them useful when a load should remain off until the relay coil is energized. Form C versions provide changeover contacts, supporting normally open and normally closed switching functions within the same relay.

Applications

Potential applications for GCT RLP20, RLP30, and RLP70 relays include:

• AC mains load switching
• DC power control
• HVAC fan and compressor control
• Thermostat and temperature-control systems
• Lighting control modules
• Smart switches and connected home devices
• Motor and pump control
• Solenoid and valve actuation
• Power distribution boards
• Alarm and security panels
• Industrial control interfaces
• Appliance control boards
• Battery-powered control systems using 5 V, 12 V, or 24 V logic supplies

Industries

These PCB-mounted relays can be used across a range of industries, including:

• Industrial automation
• Building automation
• HVAC and refrigeration
• Consumer appliances
• Smart home and IoT products
• Energy management
• Lighting and electrical controls
• Security and access control
• Water treatment and pumping
• Test and measurement equipment
• Commercial equipment manufacturing
• Transportation auxiliary electronics

Usage Ideas

1. Wi-Fi Smart Power Controller
   Use a 5 V coil relay with a microcontroller-based Wi-Fi module to switch lighting, small appliances, or outlet-connected loads remotely.

2. HVAC Fan Control Board
   Combine a 12 V or 24 V relay with temperature sensors and a controller to operate ventilation fans, dampers, or heating-control circuits.

3. Automatic Water Pump System
   Use a relay to connect a low-voltage float switch or microcontroller to a higher-current pump, allowing automatic tank filling or drainage control.

Conclusion

GCT RLP20, RLP30, and RLP70 PCB-mounted relays provide flexible, reliable switching options for power and control designs. With multiple coil voltages, Form A and Form C contact choices, flux-tight construction, and load ratings from 3 A to 16 A, the series is well suited to appliance, HVAC, automation, industrial, and smart-control applications.