PCB Power Relays which also contain an armature, a spring and one or several contacts. If the power relay is designed to normally be open, when power is applied, the electromagnet attracts the armature, which is then pulled in the coil's direction until it reaches a contact, therefore closing the circuit. If the relay is designed to be normally closed, the electromagnetic coil pulls the armature away from the contact, therefore opening the circuit.
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PCB Power Relays (G2RL Series ):- A wide variety of single pole, double pole, high-capacity (16 Amp) type and high-sensitivity type (250 mW) Omron Relays are available , Low profile; 15.7 mm max. in height .