Plug-in unit that installs as easily as a circuit breaker. Uses 2-pole spaces for use in load centers and panelboards. Provides surge suppression for most secondary distribution wiring. Square D™ brand Homeline™ load center products feature compact and affordable Surge Protective Devices (SPDs). HOM2175SB SPDs offer a simple means to bring down initial surges to manageable levels and can offer additional value in a cascaded SPD system. HOM2175SB SPDs Square D™ brand Surgelogic™ Homeline™ load center SPDs utilize high-energy circuitry that provides surge suppression from severe transient activity. Each MOV is individually fused. Directly connected to the equipment bus, the HOM2175SB delivers superior surge suppression performance by providing the shortest lead lengths. Quick plug-on device for use in a Homeline™ load center. The SPD requires two adjacent mounting spaces.