5V Single-Channel Relay Module

5v single-channel relay module
a 5v single-channel relay module is an electromechanical device that acts as an electronic switch. it allows a low voltage control signal (such as from a microcontroller like arduino) to control higher voltage devices (such as motors, lights, or home appliances). the relay operates by activating an internal switch when a control signal is received, and it is widely used for automation, switching devices, and controlling ac/dc loads.

the 5v relay module is typically equipped with a transistor for controlling the relay, an optocoupler for isolation (to prevent high voltage spikes from damaging the control circuit), and a diode for back emf protection. this makes the relay module suitable for various embedded system projects, especially where safety and isolation are required.

specifications of 5v single-channel relay module
general features
-relay type: single-channel (single pole double throw - spdt)
-operating voltage: 5v dc
-control signal voltage: 3.3v - 5v dc (compatible with microcontrollers like arduino)
-relay contacts: 1 normally open (no), 1 normally closed (nc), and 1 common (com)
-relay type (spdt): allows switching between two different states: normally open (no) and normally closed (nc)
-relay control: low level trigger (active low)
electrical characteristics
-relay coil voltage: 5v dc
-relay coil current: ~70ma
relay contact rating:
-ac load: 250v ac, 10a
-dc load: 30v dc, 10a
-max switching voltage: 250v ac, 30v dc
-max switching current: 10a (ac and dc)
-operating temperature: -40°c to +85°c
protection & features
-optocoupler isolation: yes (provides electrical isolation between the control circuit and the load)
-flyback diode protection: yes (to protect from voltage spikes caused by inductive loads)
-indicator led: yes (to show when the relay is activated)
pinout
-vcc pin: connects to 5v dc
-gnd pin: connects to ground
-in pin: control signal input (can be connected to a digital pin on a microcontroller like arduino)
-no pin (normally open): output contact when the relay is activated
-nc pin (normally closed): output contact when the relay is deactivated
-com pin (common): shared output contact
physical dimensions
-size: approximately 40mm x 30mm x 20mm
-weight: ~10g