1PCS T78 Small Normally Open Electromagnetic Relay 5V/12V/24V 4/5Pins 20A JQCT78DC12VA xingyong (Color : 4 Pin, Size : 5V) This T78 relay from xingyong is a compact, normally open electromagnetic relay designed to switch loads with electrical isolation and reliable performance. It is suitable for a variety of control applications where a simple on/off switch is required driven by a lowvoltage coil. Key benefits Reliable normally open switching: the contact closes when the coil is energized, allowing you to control loads safely and efficiently. Versatile coil options: available in 5V, 12V, and 24V coil versions to match different control circuits and microcontroller drivers. current capability: rated for up to 20A, enabling control of moderatepower loads such as motors, heaters, and power supplies. Compact T78 form factor: small size supports compact PCB layouts and tight spaces without compromising switching performance. Flexible pin count: supports 4pin or 5pin configurations for versatile mounting and compatibility with standard relay sockets. Product attributes Brand: xingyong Model: JQCT78DC12VA Type: small electromagnetic relay, normally open (NO) Pin configuration: 4/5 pins Coil voltage: 5V/12V/24V (listing includes JQCT78DC12VA variant) Contact rating: up to 20A Mounting/style: compact relay suitable for PCB mounting and compact assemblies Color/size indicators in listing: Color : 4 Pin, Size : 5V Package quantity: 1 piece per Two to three use cases Microcontroller controlled loads: connect to a microcontroller or driver circuit to switch a DC motor or a heater, using the relay to isolate the control signal from the power load. Home or building automation: use in a smart home controller to switch lighting, fans, or appliances via a lowvoltage control signal, while handling higher current on the load side. Power supply or battery management: employ as an isolation switch in a power supply or charging circuit to safely control the connection/disconnection of current loads. Notes This description reflects the product's stated model JQCT78DC12VA, 20A contact rating, 4/5 pin options, and the listed coil voltage variants (5V/12V/24V) as described in the product title. Ideal for substitutions and replacements in compatible relay sockets and circuits.