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The 3 Pole, 3 Phase, 20 kA Nominal Current, 4-1/8 Inch Long x 3-3/8 Inch Wide x 4-1/16 Inch Deep, Hardwired Surge Protector is an electrical protection device designed to protect electrical devices and equipment from power surges caused by lightning strikes or other power disturbances. Its design offers full coverage for three electrical phases ensuring comprehensive protection for various types of installations. The 20 kA Nominal Current rating ensures that the surge protector can handle high currents during short duration, peak impulse events. Being hardwired, the surge protector is easy to install and provides permanent, tamper-proof surge protection for the electrical system it is connected to. The durable, UL Listed construction ensures that this surge protector offers long lasting performance and reliability. Overall, the 3 Pole, 3 Phase, 20 kA Nominal Current, 4-1/8 Inch Long x 3-3/8 Inch Wide x 4-1/16 Inch Deep, Hardwired Surge Protector provides exceptional protection against power surges for various applications.