| Part Number | 521663-1 | 521661-1 |
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| Manufacturer | TE Connectivity AMP Connectors | TE Connectivity AMP Connectors |
| Category | Terminals - Housings, Boots | Terminals - Housings, Boots |
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| Product Status | Active | Active |
| Style | Housing | Housing |
| Terminal Type | Quick Connect, Disconnect | Quick Connect, Disconnect |
| Gender | Female, Receptacle | Female, Receptacle |
| Terminal Size | 0.250" (6.35mm) | 0.250" (6.35mm) |
| Number of Positions | 2 | 4 |
| Stacking Direction | Side to Side | Side to Side |
| For Use With/Related Products | 0.250" (6.35mm) Quick Connects, Flag | 0.250" (6.35mm) Quick Connects, Flag |
| Mounting Type | Free Hanging (In-Line) | Free Hanging (In-Line) |
| Color | Natural | Black |