20-piece set of JQC-3FF DC relays — versatile, easy-to-fit switching for control electronics Key details 20 relays from the JQC-3FF family. Coil voltages available: 5V, 9V, 12V, or 24V DC (variants 1ZS / 1ZST). Includes both 4-pin and 5-pin footprint options for flexible board mounting. Switching capacity: up to 10A — suitable for common low- to mid-power loads (lamps, small motors, control circuits). DC coil operation for direct interface with microcontrollers, PLCs, and standard control electronics. Standard JQC-3FF pin arrangement for compatibility with existing sockets, headers, and PCB layouts. Why this set solves common problems One versatile inventory item: a 20-piece set reduces the number of different spare parts you must keep on hand while covering common coil voltages and footprint needs. Easy integration: DC coils actuate directly from common logic levels and driver circuits, simplifying wiring and control design. Fast repairs and upgrades: standardized JQC-3FF pin layout and available 4-pin/5-pin footprints let you replace relays or adapt PCBs without redesigning connector patterns. Reliable switching for typical loads: the 10A rating handles most lighting, motor, and control devices used in hobby, commercial, and light industrial projects. Practical attributes Function: electromechanical relay switching with DC coil actuation. Compatibility: designed to match JQC-3FF standard pinouts and common PCB/socket configurations; suitable for microcontrollers, driver transistors, and PLC outputs. Performance: up to 10A switching capacity; dependable for low- to mid-power applications. Mounting options: 4-pin and 5-pin footprints provided for flexible board layout and wiring strategies. Typical applications (specific use scenarios) Home automation: drive wall lighting circuits, ceiling fans, or HVAC control relays from an ESP/Arduino-based hub or central controller while keeping mains switching isolated from the logic board. Industrial control panels: switch indicators, alarms, or low-current actuators with isolated contacts for safer, modular panel design. Hobby robotics and maker projects: separate microcontroller logic from motors and higher-current actuators so you can protect control electronics and simplify power distribution. What makes this set practical for engineers and makers Flexible coil voltage choices let you match the relay coil to your control supply without extra converters. Both 4-pin and 5-pin footprint options support different board layouts and wiring styles, reducing redesign time. Standardized JQC-3FF form factor ensures broad compatibility and quick part swaps during development or maintenance. 10A contact rating gives headroom for many common loads while keeping form factor and cost efficient. Ordering and selection tip Choose the coil voltage (5V, 9V, 12V, or 24V DC) and the preferred variant (1ZS / 1ZST) to match your control voltage and contact requirements. The set includes both 4-pin and 5-pin footprint options for flexible mounting.