Five relays in a single set, including JQX62F0121H and HF62F0121H models, designed for normal operation with normally open contacts. Key benefits and why you need it Enables switching of voltage AC loads from lowvoltage control signals, providing electrical isolation between control circuits and mains loads. Combines two compatible relay types in one set, offering flexibility for different load and rating requirements. 12V coil drive simplifies interfacing with common microcontrollers, PLCs, and control circuits. Product attributes Quantity: 5 pieces in one set Models included: JQX62F0121H and HF62F0121H Contact configuration: Normally Open Coil voltage: 12 V DC Electrical ratings: 16 A at 250 VAC for the JQX62F0121H; 20 A (rating shown in listing) for the HF62F0121H Brand alignment: Matches the JQX62F and HF62F series specifications and features as listed Typical applications Home and building automation: switch lighting, fans, or other mainspowered devices controlled by a microcontroller or automation controller Industrial control panels: drive AC motors, pumps, or heaters from PLCs or control circuits Appliance and HVAC control: manage relays for compressor, valve, or fan operations in equipment Use cases in more detail Microcontroller interface: drive the 12 V DC coil with a suitable transistor or driver circuit to switch a 16 A/250 VAC (JQX62F0121H) or 20 A (HF62F0121H) load, providing isolation and safety for the control side PLC or automation panel: use the NO contacts to energize power loads from a lowpower control signal, enabling reliable, isolated switching in production lines Home automation projects: implement simple relaybased control for mains devices while using standard 12 V control logic from common devices or hubs Notes This description reflects the product's listed models, ratings, and normally open configuration as provided in the title. No additional features or specifications beyond the listed items are added.