A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.
Relay Pin Configuration
Pin Number | Pin Name | Description |
1 | Coil End 1 | Used to trigger(On/Off) the Relay, Normally one end is connected to 24V and the other end to ground |
2 | Coil End 2 | Used to trigger(On/Off) the Relay, Normally one end is connected to 24V and the other end to ground |
3 | Common (COM) | Common is connected to one End of the Load that is to be controlled |
4 | Normally Close (NC) | The other end of the load is either connected to NO or NC. If connected to NC the load remains connected before trigger |
5 | Normally Open (NO) | The other end of the load is either connected to NO or NC. If connected to NO the load remains disconnected before trigger |
Features of 5-Pin 24V Relay
- Trigger Voltage (Voltage across coil) : 24V DC
- Trigger Current (Nominal current) : 15mA
- Maximum AC load current: 12A @ 250/125V AC
- Maximum DC load current: 12A @ 30/28V DC
- Compact 5-pin configuration with plastic moulding
- Operating time: 10msec Release time: 5msec
- Maximum switching: 300 operating/minute (mechanically)
Applications of Relay
- Commonly used in switching circuits.
- For Home Automation projects to switch AC loads
- To Control (On/Off) Heavy loads at a pre-determined time/condition
- Used in safety circuits to disconnect the load from supply in event of failure
- Used in Automobiles electronics for controlling indicators glass motors etc.
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