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| Part Number | SPD-20-240P | SPD-20HP-277S | SPD-10S-277S | SPD-20-277P | SPD-20HP-480S |
| Manufacturer | MEAN WELL USA Inc. | MEAN WELL USA Inc. | MEAN WELL USA Inc. | MEAN WELL USA Inc. | MEAN WELL USA Inc. |
| Series | SPD-20 | SPD-20HP | SPD | SPD-20 | SPD-20HP |
| Packaging | Box | Box | Bulk | Box | Box |
| Product Status | Active | Active | Active | Active | Active |
| Type | - | Type 2, Type 3 | Type 2, Type 3 | - | Type 2, Type 3 |
| Form | - | Module Only | Module Only | - | Module Only |
| Number of Poles | 2 | 1 | 1 | 2 | 1 |
| Voltage - Continuous Operating (Max) (MCOV) | 300VAC | 320VAC | 320VAC | 277VAC | 510VAC |
| Current - Discharge (Nom) (8/20µS) | 5 kA | 10 kA | 5 kA | 5 kA | 10 kA |
| Current - Discharge (Max) (8/20µS) | 20 kA | 20 kA | 10 kA | 20 kA | 20 kA |
| Operating Temperature | 5 kA | - | - | 5 kA | - |
| Voltage - Protection Rating (VPR) | 1.5 kV | - | - | 1.5 kV | - |
| Voltage - Protection Level (VP) (2416) | 1.5 kV | 3.8 kV | - | 1.5 kV | - |
| Operating Temperature | -40°C ~ 70°C | -40°C ~ 75°C | -40°C ~ 85°C | -40°C ~ 70°C | -40°C ~ 75°C |
| Features | - | Thermally Protected | Visual Life Indicator | - | Thermally Protected |
| Mounting Type | Screw | Chassis Mount | Surface Mount | Screw | Chassis Mount |
| Approval Agency | CE, cURus, UL | CE, cURus, KEMA-KEUR | CE, cURus, EAC | CE, cURus, UL | CE, cURus, KEMA-KEUR |
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