230 VAC 1 & 2 Pole Relays: These are electromechanical devices that are typically used in power system applications. They operate at a voltage of 230 VAC. The 1-pole relay has a single switch and can control one circuit, while the 2-pole relay has two switches and can control two separate circuits. They are often used in applications where it is necessary to control a high power or high voltage circuit with a low power circuit. 24 VAC 1 & 2 Pole Relays: These relays operate at a lower voltage of 24 VAC, making them suitable for low voltage applications. Like the 230 VAC relays, the 1-pole relay can control one circuit, and the 2-pole relay can control two separate circuits. They are commonly used in HVAC systems, alarm systems, and other applications where low voltage control is required. Both types of relays provide electrical isolation between the control and output circuits, which can be an important safety feature in many applications. They are reliable, easy to use, and widely available in various configurations to suit different needs. Please note that the exact specifications and features can vary depending on the manufacturer and model. Always refer to the product datasheet for accurate information.