SPD-20-277P

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Lighting Protection

The SPD-20-277P is a circuit protection device, specifically designed to protect circuits and equipment from damaging over-voltages and transients that can be caused by lightning. It can be used in a variety of applications such as communication systems, consumer electronics, and computer systems. In this article, we will discuss the application field and working principle of the SPD-20-277P.

Application Field

The SPD-20-277P is designed for use in general low voltage circuits, such as those found in household electrical systems. It is designed to provide protection against over-voltages and transients that can be caused by lightning or surges on electrical circuits. It has a maximum voltage rating of 277 volts AC and can withstand up to 10 KiloVolt surges. The SPD-20-277P is UL Listed for UL1449 3rd edition Type 4. It is also UL listed for UL824 Type 2.

The SPD-20-277P is designed for use in a variety of applications such as:

• Home, office, and industrial electrical systems
• HVAC systems
• Computer and communication systems
• Lighting systems
• Appliances
• Security systems

The SPD-20-277P is suitable for indoor use only.

Working Principle

The SPD-20-277P is designed to provide protection against over-voltages and transients that can be caused by lightning or surges on electrical circuits. It works by using a device called a metal oxide varistor (MOV) to absorb and dissipate the transient pulses. The MOV acts like an electrical sponge, absorbing and dissipating surge energy until it cannot any longer.

The SPD-20-277P has two parts: the MOV and the surge protector. The MOV is connected in parallel with the power circuit, while the surge protector is connected in series. When an over-voltage or transient occurs, the MOV absorbs the transient energy, while the surge protector trips and breaks the circuit to protect downstream equipment from surge damage. The SPD-20-277P is designed to trip within 0.5 seconds of a transient and will reset itself when the over-voltage conditions dissipate.

The SPD-20-277P is designed to provide an economical solution for lightning protection of residential, commercial, and industrial electrical systems. It is reliable, easy to install, and UL Listed for Type 4 and Type 2 protection. It is also UL listed for UL824 Type 2 surge protection.

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